Superconducting Properties on Two-dimensional Quasicrystal (Ta$_{0.95}$Cu$_{0.05}$)$_{1.6}$Te Studied with $^{125}$Te-NMR

H. Matsudaira; S. Kitagawa; K. Ishida; Y. Tokumoto; K. Tomiyama; K. Edagawa

doi:10.1103/kyh6-vt3q

paper

Superconducting Properties on Two-dimensional Quasicrystal (Ta $_{0.95}$ Cu $_{0.05}$ ) $_{1.6}$ Te Studied with $^{125}$ Te-NMR

arXiv:2511.04208 · doi:10.1103/kyh6-vt3q

Abstract

Physical properties in the normal and superconducting (SC) state are investigated with $^{125}$ Te-nuclear magnetic resonance (NMR) measurements in a quasicrystal $(T a_{0.95} C u_{0.05})_{1.6} Te$ , which was a recently discovered superconductor with the SC transition temperature $T_{c}$ = 0.94 K. The nuclear spin-lattice relaxation rate $1/ T_{1}$ shows a coherence peak just below $T_{c}$ , followed by an exponential decrease down to 0.1 K. The overall temperature dependence of $1/ T_{1}$ is in good agreement with an $s$ -wave SC model with a SC gap slightly smaller than the BCS value. However, the coherence peak is unusually small, which may be attributable to a reduced Bogoliubov peak theoretically predicted for quasicrystals. Furthermore, $^{125}$ Te-NMR spectra show almost no broadening nor shift in the SC state, suggesting that an unusual SC state such as parity mixing might be realized in the Ta $_{1.6}$ Te superconductor.

Superconducting Properties on Two-dimensional Quasicrystal (Ta0.95​Cu0.05​)1.6​Te Studied with 125Te-NMR

Abstract

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Superconducting Properties on Two-dimensional Quasicrystal (Ta $_{0.95}$ Cu $_{0.05}$ ) $_{1.6}$ Te Studied with $^{125}$ Te-NMR