Pressure induced superconducting dome in LaNiGa2
Yanan Zhang, Dajun Su, Zhaoyang Shan, Yunshu Shi, Rui Li, Jinyu Wu,, Zihan Yang, Kaixin Ye, Fei Zhang, Yanchun Li, Xiaodong Li, Chao Cao, Valentin, Taufour, Lin Jiao, Michael Smidman, and Huiqiu Yuan
TL;DR
This study reveals that applying pressure to LaNiGa2 enhances its superconducting transition temperature significantly without structural phase changes, indicating pressure-induced electronic structure modifications linked to superconductivity.
Contribution
It demonstrates a pressure-induced superconducting dome in LaNiGa2 and links electronic structure changes to superconductivity enhancement.
Findings
Superconducting Tc peaks at 7 GPa
No structural phase transition up to 26.3 GPa
Electronic structure changes correlate with Tc enhancement
Abstract
LaNiGa2 is a time-reversal symmetry breaking superconductor with symmetry protected band crossings, making it an ideal platform for investigating the interplay between unconventional superconductivity and electronic structure topology. Here we present a transport study of LaNiGa2 under pressure. The application of pressure to LaNiGa2 induces a significant enhancement of the superconducting transition temperature Tc at a pressure of 7 GPa. In contrast, powder X-ray diffraction (XRD) results show no evidence of structural phase transitions up to 26.3 GPa. Moreover, the ratio of band diffusivity shows a sudden increase at around 7 GPa, suggesting possible pressure-induced changes in the electronic structure that are closely linked to the evolution of superconductivity.
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