Quasi-two-dimensional Fermi surface of superconducting line-nodal metal CaSb2
Atsutoshi Ikeda, Shanta Ranjan Saha, David Graf, Prathum Saraf, Danila Sergeevich Sokratov, Yajian Hu, Hidemitsu Takahashi, Soichiro Yamane, Anooja Jayaraj, Jagoda Sławińska, Marco Buongiorno Nardelli, Shingo Yonezawa, Yoshiteru Maeno, Johnpierre Paglione
DOI 10.1103/PhysRevB.106.075151 · Physical Review B
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Abstract
We report on the Fermi surfaces and superconducting parameters of CaSb2 single crystals (superconducting below Tc∼1.8K) 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | onset |
| CaSb2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | unknown |
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