Superconductivity in the Layered Cage Compound Ba3Rh4Ge16

Yi Zhao, Jun Deng, A. Bhattacharyya, D. T. Adroja, P. K. Biswas, Lingling Gao, Weizheng Cao, Changhua Li, Cuiying Pei, Tianping Ying, Hideo Hosono, Yanpeng Qi

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4 Citations (Scopus)

Abstract

We report the synthesis and superconducting properties of a layered cage compound Ba3Rh4Ge16. Similar to Ba3Ir4Ge16, the compound is composed of 2D 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.

Original languageEnglish
Article number127402
JournalChinese Physics Letters
Volume38
Issue number12
DOIs
Publication statusPublished - Dec 2021

ASJC Scopus subject areas

  • General Physics and Astronomy

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