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Phys.: Condens. Matter"],"published-print":{"date-parts":[[2026,9,25]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Rare-earth medium-entropy alloys provide a platform for investigating how chemical disorder modifies the well-established pressure-induced structural evolution of close-packed 4\n                    <jats:italic>f<\/jats:italic>\n                    lanthanides. Here, we study TbHoEr and TbHoDy using synchrotron x-ray diffraction in diamond anvil cells. Both alloys transform from the ambient hexagonal close-packed (\n                    <jats:italic>hcp<\/jats:italic>\n                    ) structure to a double hexagonal close-packed (\n                    <jats:italic>dhcp<\/jats:italic>\n                    ) phase, while no well-resolved bulk\n                    <jats:italic>Sm-type<\/jats:italic>\n                    intermediate phase is observed. For TbHoEr, compression to 70 GPa further reveals a high-pressure rhombohedral\n                    <jats:italic>hR24<\/jats:italic>\n                    phase. Unlike the constituent heavy lanthanides, however, both alloys bypass the intermediate\n                    <jats:italic>Sm-type<\/jats:italic>\n                    phase. Two-dimensional diffraction images further reveal streak-like diffuse scattering in the transition region, indicating stacking disorder and limited stacking coherence along the close-packed direction. These observations indicate that the transformation proceeds through a stacking-disordered close-packed state rather than through a well-ordered bulk\n                    <jats:italic>Sm-type<\/jats:italic>\n                    phase. We propose that configurational disorder, local lattice distortion, stacking-fault energetics, and transformation kinetics collectively suppress the development of long-range\n                    <jats:italic>Sm-type<\/jats:italic>\n                    order. The results demonstrate that medium-entropy alloying can fundamentally modify pressure-induced stacking pathways in rare-earth materials under extreme conditions.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aea671","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T13:54:04Z","timestamp":1790085244000},"page":"385401","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Pressure-induced stacking disorder and suppression of long-range\n                    <i>Sm-type<\/i>\n                    order in medium-entropy rare-earth alloys"],"prefix":"10.1088","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5365-6773","authenticated-orcid":true,"given":"Raimundas","family":"Sereika","sequence":"first","affiliation":[{"name":"University of Alabama at Birmingham"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3370-9572","authenticated-orcid":false,"given":"Matthew P","family":"Clay","sequence":"additional","affiliation":[{"name":"University of Alabama at Birmingham"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3600-9803","authenticated-orcid":true,"given":"Kallol","family":"Chakrabarty","sequence":"additional","affiliation":[{"name":"University of Alabama at Birmingham"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"data-curation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2776-3695","authenticated-orcid":true,"given":"Yogesh K","family":"Vohra","sequence":"additional","affiliation":[{"name":"University of Alabama at Birmingham"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]}],"member":"266","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"cmaea671bib1","doi-asserted-by":"publisher","first-page":"4494","DOI":"10.1103\/PhysRevLett.78.4494","type":"journal-article","article-title":"Giant magnetocaloric effect in Gd5(Si2Ge2)","volume":"78","author":"Pecharsky","year":"1997","journal-title":"Phys. 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Published by IOP Publishing Ltd","name":"copyright_information","label":"Copyright Information"},{"value":"2026-07-14","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-09-11","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-09-22","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}