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High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor Sr x Bi 2 Se 3

We report a high-pressure transport study of the upper-critical field Bc2(T) of the topological superconductor Sr0.15Bi2Se3 (Tc=3.0 K). Bc2(T) was measured for magnetic fields directed along two orthogonal directions, a and a∗, in the trigonal basal plane. While superconductivity is rapidly suppressed at the critical pressure pc∼3.5 GPa, the pronounced two-fold basal-plane anisotropy Bac2/Ba∗c2=3.2 at T=0.3 K, recently reported at ambient pressure [Pan et al., Sci. Rep. 6 , 28632 (2016)], is reinforced and attains a value of ∼5 at the highest pressure (2.2 GPa). The data reveal that the unconventional superconducting state with broken rotational symmetry is robust under pressure.