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Superconductivity in the Layered Cage Compound Ba_3Rh_4Ge_(16)

赵毅  邓俊  A.Bhattacharyya  D.T.Adroja  P.K.Biswas  高玲玲  曹渭征  李昌华  裴翠颖  应天平  Hideo Hosono  齐彦鹏  
【摘要】:We report the synthesis and superconducting properties of a layered cage compound Ba_3 Rh_4 Ge_(16).Similar to Ba_3 Ir_4 Ge_(16),the compound is composed of 2 D networks of cage units,formed by noncubic Rh-Ge building blocks,in marked contrast to the reported rattling compounds.The electrical resistivity,magnetization,specific heat capacity,and μSR measurements unveiled moderately coupled s-wave superconductivity with a critical temperature T_c=7.0 K,the upper critical field μ_0 H_(c2)(0)~2.5 T,the electron-phonon coupling strength λ_(e-ph) ~0.80,and the Ginzburg-Landau parameter κ~7.89.The mass reduction with the substitution of Ir by Rh is believed to be responsible for the enhancement of T_c and coupling between the cage and guest atoms.Our results highlight the importance of atomic weight of framework in cage compounds in controlling the λ_(e-ph) strength and T_c.

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