首页|Decoupling of Rattling Mode and Superconductivity in Filled-Skutterudite BaxIr4Sb12
Decoupling of Rattling Mode and Superconductivity in Filled-Skutterudite BaxIr4Sb12
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
The rattling mode,an anharmonic vibrational phonon,is widely recognized as a critical factor in the emergence of superconductivity in caged materials.Here,we present a counterexample in a filled-skutterudite superconductor BaxIr4Sb12(x=0.8,0.9,1.0),synthesized via a high-pressure route.Transport measurements down to liquid 3He temperatures reveal a transition temperature(Tc)of 1.2 K and an upper critical field(Hc2)of 1.3 T.Unlike other superconductors with caged structures,the BaxIr4X12(X=P,As,Sb)family exhibits a monotonic decreasing Tc with the enhancement of the rattling mode,as indicated by fitting the Bloch-Grüneisen formula.Theoretical analysis suggests that electron doping from Ba transforms the direct bandgap IrSb3 into a metal,with the Fermi surface dominated by the hybridization of Ir 5d and Sb 5p orbitals.Our findings of decoupled rattling modes and superconductivity distinguish the BaxIr4Sb12 family from other caged superconductors,warranting further exploration into the underlying mechanism.
刘辉、于同旭、张志华、应天平
展开 >
School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China
Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China
Suzhou Laboratory,Suzhou 215123,China
展开 >
Beijing Natural Science FoundationNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
万方数据
