High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor SrxBi2Se3

Abstract

We report a high-pressure transport study of the upper-critical field, $B_{c2}(T)$, of the topological superconductor Sr${}_{0.15}$Bi${}_2$Se${}_3$ ($T_c=3.0$ K). $B_{c2}(T)$ was measured for magnetic fields directed along two orthogonal directions, $a$ and $a^{\ast }$, in the trigonal basal plane. While superconductivity is rapidly suppressed at the critical pressure $p_c\sim 3.5$ GPa, the pronounced two-fold basal-plane anisotropy $B_{c2}^a/B_{c2}^{a^{\ast }}=3.2$ at $T=0.3$ K, recently reported at ambient pressure (Pan et al., 2016), is reinforced and attains a value of $\sim 5$ at the highest pressure (2.2 GPa). The data reveal that the unconventional superconducting state with broken rotational symmetry is robust under pressure.

References in corpus (6)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
• Local Measurements of the Superconducting Pairing Symmetry in CuxBi2Se3
• Superconducting doped topological materials
• Dependence of superconductivity in CuxBi2Se3 on quenching conditions

Cited by in corpus (3)

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• An increase in $T_c$ under hydrostatic pressure in the superconducting doped topological insulator Nb${}_{0.25}$Bi${}_2$Se${}_3$
• Superconducting and normal-state anisotropy of the doped topological insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$