Multiband superconductivity in Ta${}_4$Pd${}_3$Te${}_{16}$ with anisotropic gap structure

Abstract

We carried out the measurements of magnetoresistance, magnetic susceptibility and specific heat on crystals of the low-dimensional transition metal telluride Ta${}_4$Pd${}_3$Te${}_{16}$. Our results indicate that Ta${}_4$Pd${}_3$Te${}_{16}$ is an anisotropic type-II superconductor with the extracted Ginzburg-Landau parameter ${\kappa }_{\text{GL}}=$ 84. The upper critical field $H_{c2}$($T$) shows a linear dependence at low temperature and the anisotropy of $H_{c2}$($T$) is strongly $T$-dependent, both of which indicate a multiband scenario. A detailed analysis reveals that the electronic specific heat $C_{\text{el}}$($T$) can be consistently described by a two-gap ($s$+$d$ waves) model from the base temperature $T/T_c\sim$ 0.12 up to $T_c$. Our data suggests multiband superconductivity in Ta${}_4$Pd${}_3$Te${}_{16}$ with anisotropic gap structure.

6 pages, 4 figures

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Cited by in corpus (4)

• Thermodynamic Anomaly Above the Superconducting Critical Temperature in the Quasi One-Dimensional Superconductor Ta${}_4$Pd${}_3$Te${}_{16}$
• Charge fluctuations and nodeless superconductivity in quasi-one-dimensional Ta${}_4$Pd${}_3$Te${}_{16}$ revealed by ${}^{125}$Te-NMR and ${}^{181}$Ta-NQR
• Pressure induced change in the electronic state of Ta${}_4$Pd${}_3$Te${}_{16}$
• Evidence for nodal superconductivity in a layered compound Ta${}_4$Pd${}_3$Te${}_{16}$