Pressure-induced enhancement of superconductivity in a non-centrosymmetric compound LaPtGe

• DOI: 10.48550/arxiv.2403.14568
• Publication Date: 2024-03-21
• Authors: Sathiskumar Maria...; Dilip Bhoi; Boby Joseph; R. P. Singh; Govindaraj Lingannan; Velaga Srihari; S. Arumugam; Yoshiya Uwatoko
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Superconductivity; FOS: Physical sciences

We report a pressure-induced enhancement of the superconducting transition temperature (Tc) in non-centrosymmetric (NCS) compound, LaPtGe. With pressure, till 3 GPa, we observed modest Tc with rate 0.071 K/GPa. However, above this showed ~2.5 times increase, 0.183 3.94 K at 6 highest pressure value used our transport study. Synchrotron high-pressure x-ray powder diffraction (HP-XRPD) measurements do not reveal any structural phase system range. it an apparent change slope dependence lattice parameters and below GPa. Pressure unit-cell volume also followed distinct trend Birch-Murnaghan equation state fit providing bulk modulus (B0) ~144 ~162 respectively, for two regions. Further, magnetotransport measurement under up to 2.45 GPa reveals upper critical field (Hc2(0)) from 0.7 T (0 GPa) 0.92 (2.45 GPa). In addition, upward curvature Hc2(T) becomes stronger increasing suggesting underlying Fermi surface topology pressure. The signature inducible around noticeable suggests possibility multi-gap superconductivity LaPtGe similar identical structure NCS LaPtSi. by can be correlated possible modulation compression density states level. Also, bare pressure-dependent activation energy U0 calculated using Arrhenius relation clearly shows that shift does arise grain boundaries.