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Superconducting properties of Rh₉In₄S₄ single crystals
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Superconducting properties of Rh$_{9}$In$_4$S$_4$ single crystals
abstract
The synthesis and crystallographic, thermodynamic and transport properties of single crystalline Rh$_{9}$In$_4$S$_4$ were studied. The resistivity, magnetization and specific heat measurements all clearly indicate bulk superconductivity with a critical temperature, $T_{c}\sim$ 2.25 K. The Sommerfeld coefficient $\gamma$ and the Debye temperature($\varTheta_{\textrm{D}}$) were found to be 34 mJ mol$^{-1}$ K$^{-2}$ and 217 K respectively. The observed specific heat jump, $\Delta C/\gamma T_{c}$ = 1.66, is larger than the expected BCS weak coupling value of 1.43. Ginzburg-Landau (GL) ratio of the low temperature GL-penetration depth, $\lambda_\text{GL}$$\approx$ 5750\AA, to the GL-coherence length, $\xi_\text{GL}$$\approx$ 94\AA, is large: $\kappa$ $\sim$ 60. Furthermore, we observed a peak effect in the resistivity measurement as a function of both temperature and magnetic field.
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