Anisotropic superconducting gap probed by Te125 NMR in noncentrosymmetric Sc6MTe2 (M=Fe,Co)
Kanako Doi, Hayase Takei, Yusaku Shinoda, Yoshihiko Okamoto, Daigorou Hirai, Koshi Takenaka, Taku Matsushita, Yoshiaki Kobayashi, Yasuhiro Shimizu
DOI 10.1103/PhysRevB.111.214502 · Physical Review B
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Abstract
The superconducting gap symmetry is investigated by Te125 NMR measurements on Sc6MTe2 (M=Fe,Co) without spatial inversion symmetry. The spin susceptibility obtained from the Knight shift K is suppressed below the superconducting transition temperature, while leaving a finite value down to the lowest temperature (≃0.4 K). The nuclear spin-lattice relaxation rate 1/T1 follows a power law against temperature T without showing a coherence peak characteristic of the isotropic gap. The result implies a pairing admixture or a residual density of states under magnetic field. The normal metallic state has a Korringa scaling relation between 1/T1T and the Knight shift, reflecting a weak electron correlation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sc6FeTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | unknown |
| Sc6CoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.6 | Pressure not reported | unknown |
| Sc6FeTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.4 | Pressure not reported | unknown |
| Sc6CoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
| Sc6FeTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.3 | Pressure not reported | zero_resistance |
| Sc6CoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | zero_resistance |
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