Low temperature specific heat of La_{3}Pd_{4}Ge_{4} with U_{3}Ni_{4}Si_{4}-type structure

Abstract

Low temperature specific heat has been investigated in a novel ternary superconductor La_{3}Pd_{4}Ge_{4} with an U_{3}Ni_{4}Si_{4}-type structure consisting of the alternating BaAl_{4} (ThCr_{2}Si_{2})- and AlB${}_2$-type layers. A comparative study with the related ThCr_{2}Si_{2}-type superconductor LaPd_{2}Ge_{2}, one of the layers in La_{3}Pd_{4}Ge_{4}, is also presented. From the normal state specific heat, the Sommerfeld coefficient ${\gamma }_n=27.0$ mJ/mol K^2 and the Debye temperature ${\Theta }_{\mathrm{D}}$ = 256 K are derived for the La_{3}Pd_{4}Ge_{4}, while those for the LaPd_{2}Ge_{2} are ${\gamma }_n=8.26$ mJ/mol K^2 and ${\Theta }_{\mathrm{D}}$ = 291 K. The La_{3}Pd_{4}Ge_{4} has moderately high electronic density of state at the Fermi level. Electronic contribution on the specific heat, $C_{\mathrm{el}}$, in each compound is well described by the BCS behavior, suggesting that both of the La_{3}Pd_{4}Ge_{4} and the LaPd_{2}Ge_{2} have fully opened isotropic gap in the superconducting state.

References in corpus (1)

• Electrical and magnetic properties of the new Kondo-lattice compound Ce3Pd4Ge4

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• Electronic structure of non-centrosymmetric superconductor LaPdSi3 and its reference compound LaPdGe3
• Electronic structure of the 344-type superconductors La3(Ni;Pd)4(Si;Ge)4 by ab initio calculations
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• The electronic structure of CeNiGe3 and YNiGe3 superconductors by ab initio calculations