Manasi Mandal, A. Kataria, P. K. Meena, R. K. Kushwaha, D. Singh, P. K. Biswas, R. Stewart, A. D. Hillier, R. P. Singh
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Time-Reversal Symmetry Breaking in Re-Based Kagome Lattice Superconductor
We investigated the Re-based kagome superconductor Re$_2$Zr through various
measurements, including resistivity, magnetization, specific heat, and muon
spin rotation and relaxation spectroscopy. These results suggest that Re$_2$Zr
is a moderately coupled potential two-gap superconductor. Zero-field muon
relaxation data indicate the possible presence of a time-reversal
symmetry-breaking state in the superconducting ground state. Our investigation
identifies Re$_{2}$Zr as a new unconventional superconductor with a potential
complex order parameter that warrants considerable experimental and theoretical
interest.
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