Nanocalorimetric evidence for nematic superconductivity in the doped topological insulator Sr0.1Bi2Se3
Kristin Willa, Roland Willa, Kok Wee Song, G. D. Gu, John A. Schneeloch, Ruidan Zhong, Alexei E. Koshelev, Wai-Kwong Kwok, Ulrich Welp
DOI 10.1103/PhysRevB.98.184509 · Physical Review B
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Abstract
Spontaneous rotational-symmetry breaking in the superconducting state of doped Bi2Se3 has attracted significant attention as an indicator for topological superconductivity. In this paper, high-resolution calorimetry of the single-crystal Sr0.1Bi2Se3 provides unequivocal evidence of a twofold rotational symmetry in the superconducting gap by a bulk thermodynamic probe, a fingerprint of nematic superconductivity. The extremely small specific heat anomaly resolved with our high-sensitivity technique is consistent with the material's low carrier concentration proving bulk superconductivity. The large basal-plane anisotropy of Hc2 (Γexp=3.5) is attributed to a nematic phase of a two-component topological gap structure η=(η1,η2) and caused by a symmetry-breaking energy term δ(|η1|2−|η2|2)Tc. A quantitative analysis of our data excludes more conventional sources of this twofold anisotropy and provides an estimate for the symmetry-breaking strength δ≈0.1, a value that points to an onset transition of the second order parameter component below 2 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.1Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.95 | Pressure not reported | unknown |
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