Nodeless superconductivity in topologically nontrivial materials HfRuP and ZrRuAs

Weiyin Duan; Zhiyong Nie; Dayu Yan; Hang Su; Yuxin Chen; Ye Chen; Youguo Shi; Yu Song; Huiqiu Yuan

doi:10.1088/1361-648X/ac8f0a

Nodeless superconductivity in topologically nontrivial materials HfRuP and ZrRuAs

J Phys Condens Matter. 2022 Sep 12;34(45). doi: 10.1088/1361-648X/ac8f0a.

Authors

Weiyin Duan^{1

2}, Zhiyong Nie^{1

2}, Dayu Yan³, Hang Su^{1

2}, Yuxin Chen^{1

2}, Ye Chen^{1

2}, Youguo Shi^{3

4}, Yu Song^{1

2}, Huiqiu Yuan^{1

2

5

6}

Affiliations

¹ Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China.
² Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310058, People's Republic of China.
³ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
⁴ School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
⁵ State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310058, People's Republic of China.
⁶ Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China.

PMID: 36055225
DOI: 10.1088/1361-648X/ac8f0a

Abstract

Topologically nontrivial electronic states are recently found in a family of noncentrosymmetric transition metal pnictidesTRuX(T=Zr, Hf;X=P, As), presenting a unique platform for superconductivity to interplay with topological electronic states and asymmetric spin-orbit coupling. Here, we investigate the superconducting order parameter of HfRuP and ZrRuAs by measuring the magnetic penetration depth changeΔλ(T)using a method based on the tunnel-diode oscillator. Both compounds show clear exponential temperature dependence inΔλ(T)at low temperatures, suggesting fully-gapped superconductivity. Moreover, the superfluid densities in both HfRuP and ZrRuAs can be reasonably described by ans-wave superconducting model.

Keywords: magnetic penetration depth; superconducting order parameter; topologically nontrivial materials.