High-pressure study of the basal-plane anisotropy of the upper critical field of the topological superconductor SrxBi2Se3
A. M. Nikitin, Y. Pan, Y. K. Huang, T. Naka, A. de Visser
DOI 10.1103/PhysRevB.94.144516 · Physical Review B
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Abstract
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 Bc2a/Bc2a*=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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.15Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure unresolved | midpoint |
| Sr0.15Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | 2.15 GPa | midpoint |
| Sr0.065Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CuxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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