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 (15)

• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Uniaxial-strain Control of Nematic Superconductivity in Sr${}_x$Bi${}_2$Se${}_3$
• Direction and symmetry transition of the vector order parameter in topological superconductors Cu${}_x$Bi${}_2$Se${}_3$
• Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn${}_{1-x}$In${}_x$Te for x $\ge$ 0.10
• Topological $s$-wave superconductors driven by electron correlation
• The effect of interorbital scattering on superconductivity in doped Dirac materials
• Phonon-induced rotation of the electronic nematic director in superconducting Bi${}_2$Se${}_3$
• Spin-Nernst Effect in Time-Reversal-Invariant Topological Superconductors
• An increase in $T_c$ under hydrostatic pressure in the superconducting doped topological insulator Nb${}_{0.25}$Bi${}_2$Se${}_3$
• Anisotropic Upper Critical Field, Seebeck and Nernst Coefficient in Nb0.20Bi2Se3 Topological Superconductor
• Pauli paramagnetism of triplet Cooper pairs in a nematic superconductor
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• Superconducting and normal-state anisotropy of the doped topological insulator Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Surface chiral superconductivity in odd-parity nematic superconductors with magnetic impurities
• Quantum Oscillations and Superconductivity in YPtBi Under Pressure