Critical current density and vortex phase diagram in the superconductor Sn0.55In0.45Te
Yiming Wang, Mingtao Li, Cuiying Pei, Lingling Gao, Kejun Bu, Dong Wang, Xuqiang Liu, Limin Yan, Jia Qu, Nana Li, Bihan Wang, Yifei Fang, Yanpeng Qi, Wenge Yang
DOI 10.1103/PhysRevB.106.054506 · Physical Review B
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Abstract
Critical current density and vortex pinning dynamics have been studied in the superconductor Sn0.55In0.45Te. Analysis of the temperature-dependent lower critical field shows that it has a weakly anisotropic single energy gap. The critical current density Jc(0) and pinning potential U0(H) values reach as high as 2.56×103A/cm2 at 1.8 K and 2.1×103 K at μ0H=0.01T, respectively. Based on the collective pinning model, we demonstrate the coexistence of vortex pinning regimes in Sn0.55In0.45Te. One is a δTc pinning regime induced by the spatial fluctuations of the transition temperature in a low field. The other is a dominantly δl pinning regime associated with the spatial variations of the charge-carrier mean free path in a higher field. This causes a nonconstant exponent of the power-law behavior Jc(T)∝Hn. A very weak vortex fluctuation is unveiled by a narrow separation between the irreversibility field μ0Hirr(T) and upper critical field μ0Hc2(T) in the vortex phase diagram. We discuss the potential application in superconducting electronics like the single-photon detector in thin film form.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn0.55In0.45Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.1 | Pressure not reported | onset |
| Sn0.55In0.45Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.04 | Pressure not reported | zero_resistance |
| SnTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sn1-xInxTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.1 | Pressure not reported | unknown |
| Sn0.96In0.04Te Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sn0.6In0.4Te 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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