標題: Upper critical magnetic field in superconducting Dirac semimetal
作者: Rosenstein, Baruch
Shapiro, B. Ya
Li, Dingping
Shapiro, I
電子物理學系
Department of Electrophysics
公開日期: 1-Oct-2018
摘要: Temperature dependence of the upper critical field H-c2 of the Dirac semimetal (DSM) with phonon-mediated pairing is considered within the semiclassical approximation. The low-temperature dependence deviates from conventional BCS superconductor with parabolic dispersion relation (WERTHAMER N. R., HELFAND E. and HOHENBERG P. C., Phys. Rev., 147 (1966) 295; HELFAND E. and WERTHAMER N. R., Phys. Rev. Lett., 13 (1964) 686) even for large adiabaticity parameter, gamma = mu/(sic)Omega), where mu is the chemical potential and Omega the Debye frequency. In particular the "reduced field", ratio of zero-temperature H (c2) to the derivative at critical temperature, h* = H (c2)(0)/(-T dH(c2)/dT)vertical bar T-c, depends on gamma and can be extended beyond the adiabatic limit. The reduced magnetic field ratio is universal (independent of the chemical potential, interaction strength, etc.) and smaller than the Werthamer ratio for clean superconductors: h* = 0.55 for DSM, h* (0) = 0.69 for parabolic band. The results are in good agreement compared with recent experiments on TaP. Copyright (C) EPLA, 2018
URI: http://dx.doi.org/10.1209/0295-5075/124/27004
http://hdl.handle.net/11536/148484
ISSN: 0295-5075
DOI: 10.1209/0295-5075/124/27004
期刊: EPL
Volume: 124
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