Charge-entropy-stabilized selenide Ag x Sn1−x Se
Abstract Configurational entropy has been discussed for high entropy alloys and high entropy oxides with multiple metal atoms sharing the same atomic site, where the entropy allows for the stability of a single phase material. Typically, the entropy from individual atoms occupying the same site is c...
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Nature Portfolio
2025-03-01
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| Series: | Communications Materials |
| Online Access: | https://doi.org/10.1038/s43246-025-00778-3 |
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| author | Mohamed Oudah Daisuke Takegami Shinji Kitao Jose L. Lado Anna Meléndez-Sans Denise S. Christovam Masato Yoshimura Ku-Ding Tsuei Graham McNally Masahiko Isobe Kathrin Küster M. Seto Bernhard Keimer D. A. Bonn Liu Hao Tjeng George Sawatzky Hidenori Takagi |
| author_facet | Mohamed Oudah Daisuke Takegami Shinji Kitao Jose L. Lado Anna Meléndez-Sans Denise S. Christovam Masato Yoshimura Ku-Ding Tsuei Graham McNally Masahiko Isobe Kathrin Küster M. Seto Bernhard Keimer D. A. Bonn Liu Hao Tjeng George Sawatzky Hidenori Takagi |
| author_sort | Mohamed Oudah |
| collection | DOAJ |
| description | Abstract Configurational entropy has been discussed for high entropy alloys and high entropy oxides with multiple metal atoms sharing the same atomic site, where the entropy allows for the stability of a single phase material. Typically, the entropy from individual atoms occupying the same site is considered, but here we expand on this to include the entropy coming from charges on the cations sharing the same site. Considering the valence skip nature of Sn, the charge-entropy picture supports the stability region of rocksalt Ag x Sn1−x Se. We find evidence for strong hybridization of the fluctuating Sn state from x-ray photoemission and Mössbauer spectroscopy, where these fluctuations on Sn are maintained to low temperature, well into the superconducting state, due to the lack of long-range order between Ag/Sn atoms in the entropy-stabilized rocksalt structure. Our charge-entropy model expands on the considerations when designing entropy-stabilized materials and opens up the possibility of designing new superconducting materials containing valence-skip elements. |
| format | Article |
| id | doaj-art-aa9460a3a46045f1985e01de0a927847 |
| institution | DOAJ |
| issn | 2662-4443 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Materials |
| spelling | doaj-art-aa9460a3a46045f1985e01de0a9278472025-08-20T03:10:18ZengNature PortfolioCommunications Materials2662-44432025-03-01611810.1038/s43246-025-00778-3Charge-entropy-stabilized selenide Ag x Sn1−x SeMohamed Oudah0Daisuke Takegami1Shinji Kitao2Jose L. Lado3Anna Meléndez-Sans4Denise S. Christovam5Masato Yoshimura6Ku-Ding Tsuei7Graham McNally8Masahiko Isobe9Kathrin Küster10M. Seto11Bernhard Keimer12D. A. Bonn13Liu Hao Tjeng14George Sawatzky15Hidenori Takagi16Max Planck Institute for Solid State ResearchMax Planck Institute for Chemical Physics of SolidsInstitute for Integrated Radiation and Nuclear Science, Kyoto UniversityDepartment of Applied Physics, Aalto UniversityMax Planck Institute for Chemical Physics of SolidsMax Planck Institute for Chemical Physics of SolidsNational Synchrotron Radiation Research CenterNational Synchrotron Radiation Research CenterMax Planck Institute for Solid State ResearchMax Planck Institute for Solid State ResearchMax Planck Institute for Solid State ResearchInstitute for Integrated Radiation and Nuclear Science, Kyoto UniversityMax Planck Institute for Solid State ResearchStewart Blusson Quantum Matter Institute, University of British ColumbiaMax Planck Institute for Chemical Physics of SolidsStewart Blusson Quantum Matter Institute, University of British ColumbiaMax Planck Institute for Solid State ResearchAbstract Configurational entropy has been discussed for high entropy alloys and high entropy oxides with multiple metal atoms sharing the same atomic site, where the entropy allows for the stability of a single phase material. Typically, the entropy from individual atoms occupying the same site is considered, but here we expand on this to include the entropy coming from charges on the cations sharing the same site. Considering the valence skip nature of Sn, the charge-entropy picture supports the stability region of rocksalt Ag x Sn1−x Se. We find evidence for strong hybridization of the fluctuating Sn state from x-ray photoemission and Mössbauer spectroscopy, where these fluctuations on Sn are maintained to low temperature, well into the superconducting state, due to the lack of long-range order between Ag/Sn atoms in the entropy-stabilized rocksalt structure. Our charge-entropy model expands on the considerations when designing entropy-stabilized materials and opens up the possibility of designing new superconducting materials containing valence-skip elements.https://doi.org/10.1038/s43246-025-00778-3 |
| spellingShingle | Mohamed Oudah Daisuke Takegami Shinji Kitao Jose L. Lado Anna Meléndez-Sans Denise S. Christovam Masato Yoshimura Ku-Ding Tsuei Graham McNally Masahiko Isobe Kathrin Küster M. Seto Bernhard Keimer D. A. Bonn Liu Hao Tjeng George Sawatzky Hidenori Takagi Charge-entropy-stabilized selenide Ag x Sn1−x Se Communications Materials |
| title | Charge-entropy-stabilized selenide Ag x Sn1−x Se |
| title_full | Charge-entropy-stabilized selenide Ag x Sn1−x Se |
| title_fullStr | Charge-entropy-stabilized selenide Ag x Sn1−x Se |
| title_full_unstemmed | Charge-entropy-stabilized selenide Ag x Sn1−x Se |
| title_short | Charge-entropy-stabilized selenide Ag x Sn1−x Se |
| title_sort | charge entropy stabilized selenide ag x sn1 x se |
| url | https://doi.org/10.1038/s43246-025-00778-3 |
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