Detection of Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor Re₆Zr Using Muon-Spin Spectroscopy,

R. P. Singh, A. D. Hillier, B. Mazidian, J. Quintanilla, J. F. Annett, D. McK. Paul, G. Balakrishnan, and M. R. Lees, Physical Review Letters 112, 107002 (2014).