Full-gap superconductivity in noncentrosymmetric Re6Zr,Re27Zr5, and Re24Zr5
K. Matano, R. Yatagai, S. Maeda, Guo-qing Zheng
DOI 10.1103/PhysRevB.94.214513 · Physical Review B
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Abstract
The noncentrosymmetric superconductor Re6Zr has attracted much interest for its possible unconventional superconducting state with broken time-reversal symmetry. Here we report Re185/187 nuclear quadrupole resonance measurements on Re6Zr (Tc=6.72 K) and the isostructural compounds Re27Zr5 (Tc=6.53 K) and Re24Zr5 (Tc=5.00 K). The nuclear spin-lattice relaxation rate 1/T1 shows a coherence peak below Tc and decreases exponentially at low temperatures in all three samples. The superconducting gap Δ derived from the 1/T1 data is 2Δ=3.58kBTc,3.55kBTc, and 3.51kBTc for Re6Zr,Re27Zr5, and Re24Zr5, respectively, which is close to the value of 3.53kBTc expected for weak-coupling superconductivity. These data suggest conventional s-wave superconductivity with a fully opened gap in this series of compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Re6Zr Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.72 | Pressure not reported | onset |
| Re27Zr5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.53 | Pressure not reported | onset |
| Re24Zr5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
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