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Title: Quasi-two-dimensional Fermi surface of superconducting line-nodal metal CaSb₂
Authors: Ikeda, Atsutoshi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-9345-2967 (unconfirmed)
Saha, Shanta Ranjan
Graf, David
Saraf, Prathum
Sokratov, Danila Sergeevich
Hu, Yajian
Takahashi, Hidemitsu
Yamane, Soichiro
Jayaraj, Anooja
Sławińska, Jagoda
Nardelli, Marco Buongiorno
Yonezawa, Shingo  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7476-3604 (unconfirmed)
Maeno, Yoshiteru
Paglione, Johnpierre
Author's alias: 池田, 敦俊
高橋, 秀光
山根, 聡一郎
米澤, 進吾
前野, 悦輝
Issue Date: 15-Aug-2022
Publisher: American Physical Society (APS)
Journal title: Physical Review B
Volume: 106
Issue: 7
Thesis number: 075151
Abstract: We report on the Fermi surfaces and superconducting parameters of CaSb₂ single crystals (superconducting below Tc ~ 1.8 K) grown by the self-flux method. The frequency of de Haas–van Alphen and Shubnikov–de Haas oscillations evidences a quasi-two-dimensional (quasi-2D) Fermi surface, consistent with one of the Fermi surfaces forming Dirac lines predicted by first-principles calculations. Measurements in the superconducting state reveal that CaSb₂ is close to a type-I superconductor with the Ginzburg-Landau parameter of around unity. The temperature dependence of the upper critical field Hc₂ is well described by a model considering two superconducting bands, and the enhancement of the effective mass estimated from Hc₂(0K) is consistent with the quasi-2D band observed by the quantum oscillations. Our results indicate that a quasi-2D band forming Dirac lines contributes to the superconductivity in CaSb₂.
Rights: ©2022 American Physical Society
URI: http://hdl.handle.net/2433/276133
DOI(Published Version): 10.1103/PhysRevB.106.075151
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