Charge fluctuations and nodeless superconductivity in quasi-one-dimensional Ta${}_4$Pd${}_3$Te${}_{16}$ revealed by ${}^{125}$Te-NMR and ${}^{181}$Ta-NQR

Abstract

We report ${}^{125}$Te nuclear magnetic resonance and ${}^{181}$Ta nuclear quadrupole resonance studies on single-crystal Ta${}_4$Pd${}_3$Te${}_{16}$, which has a quasi-one-dimensional structure and superconducts below $T_{\mathrm{c}}=4.3$ K. ${}^{181}$Ta with spin $I=7/2$ is sensitive to quadrupole interactions, while ${}^{125}$Te with spin $I=1/2$ can only relax by magnetic interactions. By comparing the spin-lattice relaxation rate ( $1/T_1$) of ${}^{181}$Ta and ${}^{125}$Te, 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 $T_{\mathrm{CDW}}=20$ K, below which the spectra are broadened and $1/T_{1}T$ drops sharply. In the superconducting state, $1/T_1$ shows a Hebel-Slichter coherence peak just below $T_{\mathrm{c}}$ for ${}^{125}$Te, indicating that Ta${}_4$Pd${}_3$Te${}_{16}$ is a full-gap superconductor without nodes in the gap function. The coherence peak is absent in the $1/T_1$ of ${}^{181}$Ta due to the strong EFG fluctuations.

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