Charge fluctuations and nodeless superconductivity in quasi-one-dimensional Ta4Pd3Te16 revealed by Te125-NMR and Ta181-NQR
Z. Li, W. H. Jiao, G. H. Cao, Guo-qing Zheng
DOI 10.1103/PhysRevB.94.174511 · Physical Review B
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Abstract
We report Te125 nuclear magnetic resonance and Ta181 nuclear quadrupole resonance studies on single-crystal Ta4Pd3Te16, which has a quasi-one-dimensional structure and superconducts below Tc=4.3 K. Ta181 with spin I=7/2 is sensitive to quadrupole interactions, while Te125 with spin I=1/2 can only relax by magnetic interactions. By comparing the spin-lattice relaxation rate (1/T1) of Ta181 and Te125, we found that electric-field-gradient (EFG) fluctuations develop below 80 K. The EFG fluctuations are enhanced with decreasing temperature due to the fluctuations of a charge density wave that sets in at TCDW=20 K, below which the spectra are broadened and 1/T1T drops sharply. In the superconducting state, 1/T1 shows a Hebel-Slichter coherence peak just below Tc for Te125, indicating that Ta4Pd3Te16 is a full-gap superconductor without nodes in the gap function. The coherence peak is absent in the 1/T1 of Ta181 due to the strong EFG fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta4Pd3Te16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | unknown |
| Ta4Pd3Te16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.9 | Pressure not reported | unknown |
| Ta4Pd3Te16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | Pressure not reported | unknown |
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