Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr_2B_2

Recently, compounds with noncentrosymmetric crystal structure have attracted much attention for providing a rich playground in search for unconventional superconductivity. NbIr_2B_2 is a new member to this class of materials harboring superconductivity below T_{\rm c} = 7.3(2)~K and very high upper critical field that exceeds Pauli limit. Here we report... Show more