Probing superconducting gap of the high-entropy alloy Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 via Andreev reflection spectroscopy
Vuong Thi Anh Hong, Harim Jang, Soon-Gil Jung, Yoonseok Han, Jin Hee Kim, Rahmatul Hidayati, Jong-Soo Rhyee, Tuson Park
DOI 10.1103/PhysRevB.106.024504 · Physical Review B
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Abstract
High-entropy alloy (HEA) superconductors characterized as having a high mixing entropy have attracted substantial interest because of their remarkable potential for technological applications. However, the superconducting (SC) gap of HEA superconductors, which is one of the important factors for designing SC devices, has scarcely been studied. Herein, we report the direct observation of the fully gapped pairing symmetry of the HEA superconductor Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6, probed using Andreev reflection spectroscopy. The Andreev reflection, a pronounced signature of superconductivity, is observed in the differential conductance (dI/dV) spectra below the SC transition temperature Tc of 7.9 K, which is well explained by the modified Blonder-Tinkham-Klapwijk model. The SC energy gap (Δ) as a function of temperature and magnetic field follows the Bardeen-Cooper-Schrieffer (BCS) theory with Δ(0)=1.37meV. However, the gap to Tc ratio, 2Δ(0)/kBTc=4.03, is larger than the value of 3.54 predicted by the weak-coupling BCS theory, indicating that Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 belongs to the class of moderately coupled nodeless superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | onset |
| Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | onset |
| Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | unknown |
| (TaNb)0.67(HfZrTi)0.33 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 190 GPa | unknown |
| Ta20Nb20Hf20Zr20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb21Re16Zr20Hf23Ti20 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ti15Zr15Nb35Ta35 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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