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High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor Sr

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 B c2/B a ∗ c2 = 3.2 at T = 0.3 K, recently reported at ambient pressure (Pan et al., Ref. 1), 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.