TY - JOUR
T1 - Quasi-two-dimensional Fermi surface of superconducting line-nodal metal CaSb2
AU - Ikeda, Atsutoshi
AU - Saha, Shanta Ranjan
AU - Graf, David
AU - Saraf, Prathum
AU - Sokratov, Danila Sergeevich
AU - Hu, Yajian
AU - Takahashi, Hidemitsu
AU - Yamane, Soichiro
AU - Jayaraj, Anooja
AU - Sławińska, Jagoda
AU - Nardelli, Marco Buongiorno
AU - Yonezawa, Shingo
AU - Maeno, Yoshiteru
AU - Paglione, Johnpierre
N1 - Funding Information:
Research at the University of Maryland was supported by the U.S. Department of Energy Award No. DE-SC0019154 (magnetic and transport experiments), the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF9071 (materials synthesis), and the Maryland Quantum Materials Center. The National High Magnetic Field Laboratory is supported by the National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. DC magnetization down to 0.5 K was measured in the Research Center for Low Temperature and Materials Sciences, Kyoto University. Measurements in Kyoto were supported by the Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (No. JPJSCCA20170002) and the JSPS KAKENHI (No. JP17H06136, No. JP20H05158, and No. JP20F20020). Y.J.H. is supported by the JSPS Research Fellowship. J.S. acknowledges the Rosalind Franklin Fellowship from the University of Groningen. The theoretical calculations were carried out at the Texas Advanced Computing Center at the University of Texas, Austin. M.B.N. and A.J. acknowledge support from the US Department of Energy through Grant No. DE-SC0019432.
Publisher Copyright:
© 2022 American Physical Society.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85137680195
U2 - 10.1103/PhysRevB.106.075151
DO - 10.1103/PhysRevB.106.075151
M3 - Article
SN - 0163-1829
VL - 106
JO - Physical Review B
JF - Physical Review B
IS - 7
M1 - 075151
ER -