$\mu$SR study on noncentrosymmetric superconductor NbGe$_{\mathbf{2}}$
$\mu$SR study on noncentrosymmetric superconductor NbGe$_{\mathbf{2}}$
We report a muon spin relaxation ($\mu$SR) study on polycrystalline noncentrosymmetric superconductor NbGe$_2$~with the superconducting transition temperature $T_c=2.0\sim2.1$~K. Zero-field $\mu$SR~experiment indicates the absence of spontaneous magnetic field in the superconducting state, showing the preservation of time-reversal symmetry in the superconducting state. Transverse-field $\mu$SR~experiment is performed to map the phase diagram …