Probing the superconducting gap structure in the noncentrosymmetric topological superconductor ZrRuAs

no code implementations • 20 Jan 2021 • Debarchan Das, D. T. Adroja, M. R. Lees, R. W. Taylor, Z. S. Bishnoi, V. K. Anand, A. Bhattacharyya, Z. Guguchia, C. Baines, H. Luetkens, G. B. G. Stenning, Lei Duan, Xiancheng Wang, Changqing Jin

The superconducting gap structure of a topological crystalline insulator (TCI) candidate ZrRuAs ($T^{\rm on}_{\rm c}$ = 7. 9(1) K) with a noncentrosymmetric crystal structure has been investigated using muon spin rotation/relaxation ($\mu$SR) measurements in transverse-field (TF) and zero-field (ZF) geometries.

Superconductivity Strongly Correlated Electrons

Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La$_{7}$Pd$_{3}$

no code implementations • 17 Dec 2020 • D. A. Mayoh, A. D. Hillier, G. Balakrishnan, M. R. Lees

Time-reversal symmetry breaking (TRSB) with a Bardeen-Cooper-Schrieffer (BCS) -like superconductivity occurs in a small, but growing number of noncentrosymmetric (NCS) materials, although the mechanism is poorly understood.

Superconductivity Strongly Correlated Electrons

Evidence of type-I and type-II superconductivity and their coexistence in ZrB12

no code implementations • 20 Oct 2019 • P. K. Biswas, A. D. Hillier, R. P. Singh, N. Parzyk, G. Balakrishnan, M. R. Lees, C. D. Dewhurst, E. Morenzoni, y, D. McK. Paul

Analysing the local magnetic field distribution obtained from the muSR spectra we identify regions of a Meissner state where the applied magnetic field is entirely expelled from the sample, an intermediate state where normal and Meissner states coexist, and a mixed state where a well-defined flux-line lattice is formed.

Superconductivity