Unconventional periodicities of the Little-Parks effect observed in a topological superconductor
Yufan Li, Xiaoying Xu, Shu-Ping Lee, C. L. Chien
DOI 10.1103/PhysRevB.109.L060504 · Physical Review B
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Abstract
In superconductors, the condensation of Cooper pairs gives rise to fluxoid quantization in discrete units of Φ0=hc/2e. The denominator of 2e is the signature of electron pairing, which is evidenced by a number of macroscopic quantum phenomena, such as the Little-Parks effect and the Josephson effect, where the critical temperature or the critical current oscillates with the periodicity of Φ0. Here we report the observation of Little-Parks oscillation periodicities of 2Φ0, 3Φ0, and 4Φ0, besides the conventional Φ0, in mesoscopic rings of epitaxial β−Bi2Pd, a topological superconductor. These unexpected findings suggest new physics to account for the observed quantizations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | unknown |
| Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | unknown |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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