Journal
PHYSICAL REVIEW B
Volume 106, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.075151
Keywords
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Funding
- U.S. Department of Energy [DE-SC0019154]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF9071]
- Maryland Quantum Materials Center
- National Science Foundation [DMR-1644779]
- State of Florida
- Japan Society for the Promotion of Science (JSPS) [JPJSCCA20170002]
- JSPS KAKENHI [JP17H06136, JP20H05158, JP20F20020]
- JSPS Research Fellowship
- University of Groningen
- US Department of Energy [DE-SC0019432]
- U.S. Department of Energy (DOE) [DE-SC0019154, DE-SC0019432] Funding Source: U.S. Department of Energy (DOE)
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This study reports on the Fermi surfaces and superconducting parameters of CaSb2 single crystals grown by the self-flux method. The research reveals a quasi-two-dimensional Fermi surface in CaSb2, consistent with the predicted Dirac lines. The results suggest that the formation of quasi-2D bands contributes to the superconductivity in CaSb2.
We report on the Fermi surfaces and superconducting parameters of CaSb2 single crystals (superconducting below T-c similar to 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 H-c2 is well described by a model considering two superconducting bands, and the enhancement of the effective mass estimated from H-c2(0 K) 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.
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