{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:49:16Z","timestamp":1760150956950,"version":"build-2065373602"},"reference-count":59,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,1,29]],"date-time":"2022-01-29T00:00:00Z","timestamp":1643414400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>A microwave technique suitable for investigating the AC magnetic susceptibility of small samples in the GHz frequency range is presented. The method\u2014which is based on the use of a coplanar waveguide resonator, within the resonator perturbation approach\u2014allows one to obtain the absolute value of the complex susceptibility, from which the penetration depth and the superfluid density can be determined. We report on the characterization of several iron-based superconducting systems, belonging to the 11, 122, 1144, and 12442 families. In particular, we show the effect of different kinds of doping for the 122 family, and the effect of proton irradiation in a 122 compound. Finally, the paradigmatic case of the magnetic superconductor EuP-122 is discussed, since it shows the emergence of both superconducting and ferromagnetic transitions, marked by clear features in both the real and imaginary parts of the AC susceptibility.<\/jats:p>","DOI":"10.3390\/ma15031079","type":"journal-article","created":{"date-parts":[[2022,1,30]],"date-time":"2022-01-30T00:12:56Z","timestamp":1643501576000},"page":"1079","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["High-Frequency ac Susceptibility of Iron-Based Superconductors"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3368-1319","authenticated-orcid":false,"given":"Gianluca","family":"Ghigo","sequence":"first","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6339-4188","authenticated-orcid":false,"given":"Michela","family":"Fracasso","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6543-864X","authenticated-orcid":false,"given":"Roberto","family":"Gerbaldo","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Gozzelino","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5271-6575","authenticated-orcid":false,"given":"Francesco","family":"Laviano","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrea","family":"Napolitano","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9669-5761","authenticated-orcid":false,"given":"Guang-Han","family":"Cao","sequence":"additional","affiliation":[{"name":"Department of Physics, Zhejiang University, Hangzhou 310027, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3977-3006","authenticated-orcid":false,"given":"Michael J.","family":"Graf","sequence":"additional","affiliation":[{"name":"Department of Physics, Boston College, Chestnut Hill, MA 02467, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8088-6096","authenticated-orcid":false,"given":"Ruslan","family":"Prozorov","sequence":"additional","affiliation":[{"name":"Ames Laboratory, Ames, IA 50011, USA"},{"name":"Department of Physics & Astronomy, Iowa State University, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1386-5762","authenticated-orcid":false,"given":"Tsuyoshi","family":"Tamegai","sequence":"additional","affiliation":[{"name":"Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhixiang","family":"Shi","sequence":"additional","affiliation":[{"name":"School of Physics, Southeast University, Nanjing 211189, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiangzhuo","family":"Xing","sequence":"additional","affiliation":[{"name":"School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9551-1716","authenticated-orcid":false,"given":"Daniele","family":"Torsello","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy"},{"name":"Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125 Torino, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"10012","DOI":"10.1021\/ja063355c","article-title":"Iron-Based Layered Superconductor: LaOFeP","volume":"128","author":"Kamihara","year":"2006","journal-title":"J. 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