Electron-phonon coupling and superconductivity in an alkaline earth hydride CaH6 at high pressures
DC Field | Value | Language |
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dc.contributor.author | Jeon, Hyunsoo | - |
dc.contributor.author | Wang, Chongze | - |
dc.contributor.author | Liu, Shuyuan | - |
dc.contributor.author | Bok, Jin Mo | - |
dc.contributor.author | Bang, Yunkyu | - |
dc.contributor.author | Cho, Jun-Hyung | - |
dc.date.accessioned | 2022-10-25T07:45:03Z | - |
dc.date.available | 2022-10-25T07:45:03Z | - |
dc.date.created | 2022-10-06 | - |
dc.date.issued | 2022-08 | - |
dc.identifier.issn | 1367-2630 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/172594 | - |
dc.description.abstract | Recently, an alkaline earth hydride CaH6 having a sodalitelike clathrate structure has been experimentally synthesized at megabar pressures with a maximum T (c) of 215 K, comparable to that of a rare earth hydride LaH10. Here, based on first-principles calculations, we find that CaH6 exhibits a huge peak in the Eliashberg spectral function alpha (2) F around the low-frequency region of H-derived phonon modes, in contrast to LaH10 having a widely spreading spectrum of alpha (2) F over the whole frequencies of H-derived phonon modes. It is revealed that the huge peak of alpha (2) F in CaH6 is associated with an effective electron-phonon coupling (EPC) between low-frequency optical phonons and hybridized H 1s and Ca 3d states near the Fermi energy. As pressure increases, the strengthened H-H covalent bonding not only induces a hardening of optical phonon modes but also reduces the electron-phonon matrix elements related to the low-frequency optical modes, thereby leading to a lowering of the EPC constant. It is thus demonstrated that H-derived low-frequency phonon modes play an important role in the pressure-induced variation of T (c) in CaH6. Furthermore, unlike the presence of two distinct superconducting gaps in LaH10, CaH6 is found to exhibit a single isotropic superconducting gap. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | IOP Publishing Ltd | - |
dc.title | Electron-phonon coupling and superconductivity in an alkaline earth hydride CaH6 at high pressures | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Cho, Jun-Hyung | - |
dc.identifier.doi | 10.1088/1367-2630/ac8a0c | - |
dc.identifier.scopusid | 2-s2.0-85137648285 | - |
dc.identifier.wosid | 000849619300001 | - |
dc.identifier.bibliographicCitation | NEW JOURNAL OF PHYSICS, v.24, no.8, pp.1 - 10 | - |
dc.relation.isPartOf | NEW JOURNAL OF PHYSICS | - |
dc.citation.title | NEW JOURNAL OF PHYSICS | - |
dc.citation.volume | 24 | - |
dc.citation.number | 8 | - |
dc.citation.startPage | 1 | - |
dc.citation.endPage | 10 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | Y | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Physics, Multidisciplinary | - |
dc.subject.keywordPlus | TEMPERATURE SUPERCONDUCTIVITY | - |
dc.subject.keywordPlus | LATTICE-VIBRATIONS | - |
dc.subject.keywordPlus | TRANSITION | - |
dc.subject.keywordPlus | LANTHANUM | - |
dc.subject.keywordPlus | DYNAMICS | - |
dc.subject.keywordAuthor | superconductivity | - |
dc.subject.keywordAuthor | alkaline earth | - |
dc.subject.keywordAuthor | superhydride | - |
dc.identifier.url | https://iopscience.iop.org/article/10.1088/1367-2630/ac8a0c | - |
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