Abstract
We report a high-pressure transport study of the upper-critical field of the topological superconductor K). was measured for magnetic fields directed along two orthogonal directions, and , in the trigonal basal plane. While superconductivity is rapidly suppressed at the critical pressure GPa, the pronounced two-fold basal-plane anisotropy at K, recently reported at ambient pressure [Pan et al., Sci. Rep. 6, 28632 (2016)], is reinforced and attains a value of at the highest pressure (2.2 GPa). The data reveal that the unconventional superconducting state with broken rotational symmetry is robust under pressure.
- Received 12 September 2016
DOI:https://doi.org/10.1103/PhysRevB.94.144516
©2016 American Physical Society