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Effects of spin-orbit coupling on the electron-phonon superconductivity in the cubic Laves-phase compounds CaIr2 and CaRh2

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dc.contributor.authors Tutuncu, HM; Uzunok, HY; Karaca, E; Arslan, E; Srivastava, GP;
dc.date.accessioned 2020-01-20T08:02:35Z
dc.date.available 2020-01-20T08:02:35Z
dc.date.issued 2017
dc.identifier.citation Tutuncu, HM; Uzunok, HY; Karaca, E; Arslan, E; Srivastava, GP; (2017). Effects of spin-orbit coupling on the electron-phonon superconductivity in the cubic Laves-phase compounds CaIr2 and CaRh2. PHYSICAL REVIEW B, 96, -
dc.identifier.issn 2469-9950
dc.identifier.uri https://hdl.handle.net/20.500.12619/32271
dc.identifier.uri https://doi.org/10.1103/PhysRevB.96.134514
dc.description.abstract We report our ab initio pseudopotential results for the structural, electronic, vibrational, and electron-phonon interaction properties of the cubic Laves-phase compounds CaIr2 and CaRh2. While the spin-orbit coupling (SOC) does not result in any appreciable changes in structural parameters, it lifts the degeneracies of some bands near the Fermi level, albeit with a much smaller amount for CaRh2. The effect of SOC on the vibrational properties of both materials is considerable. The SOC results in a slight decrease in the electronic density of states near the Fermi level N(E-F) and makes low-frequency phonon branches harder, and the electron-phonon coupling parameter. is lowered from 1.43 to 1.05 for CaIr2 and from 1.17 to 0.96 for CaRh2. On the other hand, the logarithmically averaged phonon frequency omega(ln) is enhanced from 79.60 to 100.97 K for CaIr2 and from 120.20 to 140.80 K for CaRh2 with the inclusion of SOC. Using the calculated values of lambda and omega(ln), the superconducting critical temperatureis determined to be 5.94 K (7.34 K without SOC) for CaIr2 and 6.97 K (9.08 K without SOC) for CaRh2. The superconducting critical-temperature values with SOC compare very well with corresponding experimental values of 5.80 and 6.40 K, indicating the importance of SOC for the physical properties of both materials.
dc.language English
dc.publisher AMER PHYSICAL SOC
dc.subject Physics
dc.title Effects of spin-orbit coupling on the electron-phonon superconductivity in the cubic Laves-phase compounds CaIr2 and CaRh2
dc.type Article
dc.identifier.volume 96
dc.contributor.department Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü
dc.contributor.saüauthor Tütüncü, Hüseyin Murat
dc.contributor.saüauthor Uzunok, Hüseyin Yasin
dc.contributor.saüauthor Karaca, Ertuğrul
dc.relation.journal PHYSICAL REVIEW B
dc.identifier.wos WOS:000413050000006
dc.identifier.doi 10.1103/PhysRevB.96.134514
dc.identifier.eissn 2469-9969
dc.contributor.author Tütüncü, Hüseyin Murat
dc.contributor.author Uzunok, Hüseyin Yasin
dc.contributor.author Karaca, Ertuğrul
dc.contributor.author E. Arslan
dc.contributor.author G. P. Srivastava


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