{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:37:41Z","timestamp":1760060261216,"version":"build-2065373602"},"reference-count":48,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2025,8,8]],"date-time":"2025-08-08T00:00:00Z","timestamp":1754611200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Slovak Research and Development Agency","award":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"],"award-info":[{"award-number":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"]}]},{"name":"Slovak Scientific Grant Agency","award":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"],"award-info":[{"award-number":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"]}]},{"name":"EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia","award":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"],"award-info":[{"award-number":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"]}]},{"name":"U. S. Steel Ko\u0161ice, s.r.o.","award":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"],"award-info":[{"award-number":["APVV-23-0624","APVV-21-0042","VEGA 2\/0091\/24","09I03-03-V04-00281"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>We report about the effect of nitrogen and carbon concentration on the superconducting transition temperature TC of (NbMoTaW)1CxNy carbonitride films deposited using reactive DC magnetron sputtering. By measuring the temperature dependence of electrical resistance and magnetization of these carbonitrides, with 0.20 \u2264 x \u2264 1.17 and 0 \u2264 y \u2264 0.73, we observe a TC enhancement that occurs especially at high (x \u2265 0.76) carbon concentrations, with the largest TC = 9.6 K observed in the over-doped fcc crystal structure with x = 1.17 and y = 0.41. The reason why the largest TC appears at high C concentrations is probably related to the lower atomic mass of carbon compared to nitrogen and to the increase in the electron\u2013phonon interaction due to different bonding of carbon (compared to nitrogen) to the Nb-Mo-Ta-W metallic sublattice. However, for concentrations where y &gt; 0.71 and x + y &gt; 1.58, two structural phases begin to form. Additionally, the proximity to structural instability may play a role in the observed BC2 enhancement. Further measurements in a magnetic field show that the upper critical fields BC2 of (NbMoTaW)1CxNy carbonitrides provide BC2\/BC2 &lt; 2 T\/K, which falls within the weak-coupling pair breaking limit.<\/jats:p>","DOI":"10.3390\/ma18163732","type":"journal-article","created":{"date-parts":[[2025,8,8]],"date-time":"2025-08-08T15:30:52Z","timestamp":1754667052000},"page":"3732","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of Carbon and Nitrogen Concentrations on the Superconducting Properties of (NbMoTaW)1CxNy Carbonitride Films"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7961-7780","authenticated-orcid":false,"given":"Gabriel","family":"Prist\u00e1\u0161","sequence":"first","affiliation":[{"name":"Institute of Experimental Physics of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6236-3427","authenticated-orcid":false,"given":"Slavom\u00edr","family":"Gab\u00e1ni","sequence":"additional","affiliation":[{"name":"Institute of Experimental Physics of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8355-9165","authenticated-orcid":false,"given":"Petra","family":"Hvi\u0161\u010dov\u00e1","sequence":"additional","affiliation":[{"name":"Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jozef","family":"Dobrovodsk\u00fd","sequence":"additional","affiliation":[{"name":"Advanced Technologies Research Institute, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dmitry","family":"Albov","sequence":"additional","affiliation":[{"name":"Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0975-2060","authenticated-orcid":false,"given":"Maksym","family":"Lisnichuk","sequence":"additional","affiliation":[{"name":"Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9032-8725","authenticated-orcid":false,"given":"Oleksandr","family":"Onufriienko","sequence":"additional","affiliation":[{"name":"Institute of Experimental Physics of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Janina","family":"Zorych","sequence":"additional","affiliation":[{"name":"Institute of Experimental Physics of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"},{"name":"Faculty of Electrical Engineering and Informatics, Technical University, 042 00 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8753-554X","authenticated-orcid":false,"given":"Franti\u0161ek","family":"Lofaj","sequence":"additional","affiliation":[{"name":"Institute of Materials Research of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0004-4292","authenticated-orcid":false,"given":"Karol","family":"Flachbart","sequence":"additional","affiliation":[{"name":"Institute of Experimental Physics of the Slovak Academy of Sciences, Watsonova 47, 040 01 Ko\u0161ice, Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,8,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1007\/BF01397407","article-title":"Messungen mit Hilfe von fl\u00fcssigem Helium IX. Supraleitf\u00e4higkeit von Carbiden and Nitriden","volume":"65","author":"Meissner","year":"1930","journal-title":"Z. Phys."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"799","DOI":"10.1103\/PhysRev.87.799","article-title":"A search for new superconducting compounds","volume":"87","author":"Matthias","year":"1952","journal-title":"Phys. Rev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1403","DOI":"10.1016\/0001-6160(66)90160-X","article-title":"Superconducting critical temperatures of non-stoichiometric transition metal carbides and nitrides","volume":"14","author":"Toth","year":"1966","journal-title":"Acta Metall."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"327","DOI":"10.1103\/PhysRev.159.327","article-title":"Superconductivity of the Transition-Metal Carbides","volume":"159","author":"Willens","year":"1967","journal-title":"Phys. Rev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"224516","DOI":"10.1103\/PhysRevB.105.224516","article-title":"Tuning superconductivity in vanadium nitride films by adjusting strain","volume":"105","author":"Zou","year":"2022","journal-title":"Phys. Rev. B"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"108546","DOI":"10.1016\/j.mtcomm.2024.108546","article-title":"Superconductivity in transition metal carbides, TaC and HfC: A density functional theory study with local, semilocal, and nonlocal exchange-correlation functionals","volume":"39","author":"Azam","year":"2024","journal-title":"Mater. Today Commun."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Burdastyh, M.V., Postolova, S.V., Proslier, T., Ustavshikov, S.S., Antonov, A.V., Vinokur, V.M., and Mironov, A.Y. (2020). Superconducting phase transitions in disordered NbTiN films. Sci. Rep., 10.","DOI":"10.1038\/s41598-020-58192-3"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"214520","DOI":"10.1103\/PhysRevB.110.214520","article-title":"Nonmonotonic superconducting transition temperature and large bulk modulus in the alloy superconductor Nb4Rh2C1\u2212\u03b4","volume":"110","author":"Shi","year":"2024","journal-title":"Phys. Rev. B"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"711","DOI":"10.1103\/PhysRevB.15.711","article-title":"Observation of phonon anomalies in NbCxN1-x alloys","volume":"15","author":"Roedhammer","year":"1977","journal-title":"Phys. Rev. B"},{"key":"ref_10","unstructured":"Tinkham, M. (2004). The BCS Theory. Introduction to Superconductivity, Dover Publications. [2nd ed.]. Chapter 3."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"100644","DOI":"10.1016\/j.mser.2021.100644","article-title":"High-entropy ceramics: Review of principles, production and applications","volume":"146","author":"Akrami","year":"2021","journal-title":"Mater. Sci. Eng. R"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2301929","DOI":"10.1002\/adfm.202301929","article-title":"Discovery of the High-Entropy Carbide Ceramic Topological Superconductor Candidate (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C","volume":"33","author":"Zeng","year":"2023","journal-title":"Adv. Funct. Mater."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"100042","DOI":"10.59717\/j.xinn-mater.2023.100042","article-title":"Superconductivity and non-trivial band topology in high-entropy carbonitride (Ti0.2Nb0.2Ta0.2Mo0.2W0.2)C1\u2212xNx","volume":"1","author":"Zeng","year":"2023","journal-title":"Innov. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"119428","DOI":"10.1016\/j.actamat.2023.119428","article-title":"Multiple transition temperature enhancement in superconducting TiNbMoTaW high entropy alloy films through tailored N incorporation","volume":"262","author":"Gruber","year":"2024","journal-title":"Acta Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1758","DOI":"10.1016\/j.intermet.2010.05.014","article-title":"Refractory high entropy alloys","volume":"18","author":"Senkov","year":"2010","journal-title":"Intermetallics"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Ren, X., Li, Y., Qi, Y., and Wang, B. (2022). Review on Preparation Technology and Properties of Refractory High Entropy Alloys. Materials, 15.","DOI":"10.3390\/ma15082931"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1083","DOI":"10.1016\/j.jmrt.2024.07.153","article-title":"A review of high-entropy ceramics preparation methods, properties in different application fields and their regulation methods","volume":"32","author":"Zhang","year":"2024","journal-title":"J. Mater. Res. Technol."},{"key":"ref_18","first-page":"090301","article-title":"High-entropy alloy superconductors: Status, opportunities, and challenges","volume":"3","author":"Sun","year":"2019","journal-title":"Phys. Rev. Mat."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Idczak, R., Nowak, W., Rusin, B., Topolnicki, R., Ossowski, T., Babij, M., and Pikul, A. (2023). Enhanced Superconducting Critical Parameters in a New High-Entropy Alloy Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08. Materials, 16.","DOI":"10.3390\/ma16175814"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Kitagawa, J., Hamamoto, S., and Ishizu, N. (2020). Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research. Metals, 10.","DOI":"10.3390\/met10081078"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"60","DOI":"10.1038\/s41427-024-00579-z","article-title":"Recent advances in high-entropy superconductors","volume":"16","author":"Zeng","year":"2024","journal-title":"NPG Asia Mater."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1353623","DOI":"10.1016\/j.physc.2020.1353623","article-title":"Synthesis of RE123 high-Tc superconductors with a high-entropy-alloy-type RE site","volume":"572","author":"Shukunami","year":"2020","journal-title":"Phys. C Supercond. Its Appl."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Riedel, R. (2000). Transition metal carbides, nitrides, and carbonitrides. Handbook of Ceramic Hard Materials, WILEY-VCH Verlag GmbH. Chapter 7.","DOI":"10.1002\/9783527618217"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"241401(R)","DOI":"10.1103\/PhysRevB.68.241401","article-title":"Shapes of cagelike metal carbide clusters: First-principles calculations","volume":"68","author":"Gueorguiev","year":"2003","journal-title":"Phys. Rev. B"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1116\/1.568734","article-title":"Superconducting transition temperatures of reactively sputtered films of tantalum nitride and tungsten nitride","volume":"12","author":"Kilbane","year":"1975","journal-title":"J. Vac. Sci. Technol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2100477","DOI":"10.1002\/pssr.202100477","article-title":"Strong Electron\u2013Phonon Coupling in 3D WN and Coexistence of Intrinsic Superconductivity and Topological Nodal Line in Its 2D Limit","volume":"16","author":"Chen","year":"2022","journal-title":"Phys. Status Solidi RRL"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"140704","DOI":"10.1016\/j.tsf.2025.140704","article-title":"The effects of carbon and nitrogen incorporation on the structure, mechanical properties and superconducting transition temperature of (NbMoTaW)100-z(CN)z coatings","volume":"823","author":"Lofaj","year":"2025","journal-title":"Thin Solid Film."},{"key":"ref_28","first-page":"e012024","article-title":"Ion Beam Analysis including ToF-ERDA of complex composition layers","volume":"2712","author":"Lofaj","year":"2024","journal-title":"J. Phys. Conf. Ser."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"137411","DOI":"10.1016\/j.tsf.2019.137411","article-title":"Carbon-containing multi-component thin films","volume":"688","author":"Jansson","year":"2019","journal-title":"Thin Solid Film."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"160901","DOI":"10.1063\/1.5144154","article-title":"Multi-component and high-entropy nitride coatings\u2014A promising field in need of a novel approach","volume":"127","author":"Lewin","year":"2020","journal-title":"J. Appl. Phys."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"11685","DOI":"10.1103\/PhysRevB.48.11685","article-title":"Theory of bonding in transition-metal carbides and nitrides","volume":"48","author":"Grimvall","year":"1993","journal-title":"Phys. Rev. B"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"3023","DOI":"10.1021\/cm301516w","article-title":"Synthesis, Crystal structure, and elastic properties of novel tungsten nitrides","volume":"24","author":"Wang","year":"2012","journal-title":"Chem. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.intermet.2013.05.002","article-title":"More than entropy in high-entropy alloys: Forming solid solutions or amorphous phase","volume":"41","author":"Guo","year":"2013","journal-title":"Intermetallics"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"677","DOI":"10.1016\/j.actamat.2019.01.023","article-title":"Phase selection motifs in High Entropy Alloys revealed through combinatorial methods: Large atomic size difference favors BCC over FCC","volume":"166","author":"Kube","year":"2019","journal-title":"Acta Mater."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"448","DOI":"10.1016\/j.actamat.2016.08.081","article-title":"A critical review of high entropy alloys and related concepts","volume":"122","author":"Miracle","year":"2017","journal-title":"Acta Mater."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1354688","DOI":"10.1016\/j.physc.2025.1354688","article-title":"Thoughts about boosting superconductivity","volume":"632","year":"2025","journal-title":"Phys. C Supercond. Its Appl."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"3232","DOI":"10.1103\/PhysRevLett.68.3232","article-title":"Suppression of superconductivity by disorder","volume":"68","author":"Kirkpatrick","year":"1992","journal-title":"Phys. Rev. Lett."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1103\/PhysRevLett.80.161","article-title":"Extremely Strong Dependence of Superconductivity on Disorder in Sr2RuO4","volume":"80","author":"Mackenzie","year":"1998","journal-title":"Phys. Rev. Lett."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"184512","DOI":"10.1103\/PhysRevB.106.184512","article-title":"Superconductivity in the high-entropy alloy (NbTa)0.67(MoHfW)0.33","volume":"106","author":"Sobota","year":"2022","journal-title":"Phys. Rev. B"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"064507","DOI":"10.1103\/PhysRevB.108.064507","article-title":"Superconductivity near the Mott-Ioffe-Regel limit in the high-entropy alloy superconductor (ScZrNb)1\u2212x(RhPd)x with a CsCl-type lattice","volume":"108","author":"Gutowska","year":"2023","journal-title":"Phys. Rev. B"},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1016\/j.cplett.2011.09.045","article-title":"CFx: A first-principles study of structural patterns arising during synthetic growth","volume":"516","author":"Gueorguiev","year":"2011","journal-title":"Chem. Phys. Lett."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"74","DOI":"10.1103\/PhysRev.97.74","article-title":"Empirical relation between superconductivity and the number of valence electrons per atom","volume":"97","author":"Matthias","year":"1955","journal-title":"Phys. Rev."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"674","DOI":"10.1016\/j.scib.2023.03.018","article-title":"Emergence of superconducting dome in ZrNx films via variation of nitrogen concentration","volume":"68","author":"Chen","year":"2023","journal-title":"Sci. Bull."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"295","DOI":"10.1103\/PhysRev.147.295","article-title":"Temperature and Purity Dependence of the Superconducting Critical Field, Hc2. III. Electron Spin and Spin-Orbit Effects","volume":"147","author":"Werthamer","year":"1966","journal-title":"Phys. Rev."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1021\/acsmaterialsau.1c00011","article-title":"Superconductivity with High Upper Critical Field in the Cubic Centrosymmetric \u03b7-Carbide Nb4Rh2C1-\u03b4","volume":"1","author":"Ma","year":"2021","journal-title":"ACS Mater. Au"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"024504","DOI":"10.1103\/PhysRevB.103.024504","article-title":"Extreme high-field superconductivity in thin Re films","volume":"103","author":"Womack","year":"2021","journal-title":"Phys. Rev. B"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"266","DOI":"10.1103\/PhysRevLett.9.266","article-title":"Upper limit for the critical field in hard superconductors","volume":"9","author":"Clogston","year":"1962","journal-title":"Phys. Rev. Lett."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"4545","DOI":"10.1103\/PhysRevB.19.4545","article-title":"Pauli paramagnetic limiting, and material parameters of Nb3Sn and V3Si","volume":"19","author":"Orlando","year":"1979","journal-title":"Phys. Rev. B"}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/18\/16\/3732\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:26:53Z","timestamp":1760034413000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/18\/16\/3732"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,8,8]]},"references-count":48,"journal-issue":{"issue":"16","published-online":{"date-parts":[[2025,8]]}},"alternative-id":["ma18163732"],"URL":"https:\/\/doi.org\/10.3390\/ma18163732","relation":{},"ISSN":["1996-1944"],"issn-type":[{"type":"electronic","value":"1996-1944"}],"subject":[],"published":{"date-parts":[[2025,8,8]]}}}