Abstract
We report an investigation of the superconducting order parameter of the noncentrosymmetric compound , which is believed to have a topologically nontrivial band structure. Precise measurements of the London penetration depth obtained using a tunnel diode oscillator (TDO) based method show an exponential temperature dependence at , suggesting a nodeless superconducting gap structure. A single-gap -wave model well describes the corresponding normalized superfluid density , with a gap magnitude of . This is very close to the value of for weak-coupling BCS superconductors, indicating conventional fully-gapped superconductivity in .
- Received 13 December 2015
DOI:https://doi.org/10.1103/PhysRevB.93.060506
©2016 American Physical Society