Tip-induced superconductivity enhancement in single-crystalline PdSb by point-contact spectroscopy

Superconductivity in High-Entropy Antimonide M1–xPtxSb (M = Equimolar Ru, Rh, Pd, and Ir)

“…41 The comparable Θ D values indicate that neither significant softening nor hardening of the lattice vibrations occurred in the HE antimonides. The Sommerfeld constant γ was smaller than in the analogous antimony compounds: γ = 5.5 mJ mol −1 K −2 for RuSb, 39 γ = 2.63 mJ mol −1 K −2 for PdSb, 26 and γ = 4.9 mJ mol −1 K −2 for MgPd 2 Sb. 41 The smaller γ values were likely due to the high degree of disorder at the TM sites, which reduced in the density of states (DOS) at the Fermi energy (E F ).…”

“…The observed upper critical fields were relatively high but did not exceed the Pauli paramagnetic limit of 3.96 T. A coherence length ξ 0 of 160 Å was obtained from H c2 (0) GL , which is lower than that of other superconductors with similar T c values: T c = 1.32 K, μ 0 H c2 (0) = 0.09 T for PdSb; 26 T c = 2.2 K, μ 0 H c2 (0) = 0.194 T, ξ 0 = 412 Å for MgPd 2 Sb; 41 T c = 2.1 K, μ 0 H c2 (0) = 0.14 T, ξ 0 = 480 Å for BaIr 2 P 2 . 45,46 H c2 (0) tends to be relatively high in HEA superconductors.…”