Gumeniuk R, Schnelle W, Rosner H, Nicklas M, Leithe-Jasper A, Grin Yu
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Phys Rev Lett. 2008 Jan 11;100(1):017002. doi: 10.1103/PhysRevLett.100.017002. Epub 2008 Jan 8.
New germanium-platinum compounds with the filled-skutterudite crystal structure were synthesized. The crystal structure and composition were investigated by x-ray diffraction and microprobe analysis. Magnetic susceptibility, specific heat, and electrical resistivity measurements evidence superconductivity in LaPt4Ge12 and PrPt4Ge12 below 8.3 K. The parameters of the normal and superconducting states were established. Strong coupling and a crystal electric field singlet ground state is found for the Pr compound. Electronic structure calculations show a large density of states at the Fermi level. Similar behavior with lower Tc was observed for SrPt4Ge12 and BaPt4Ge12.
合成了具有填满型方钴矿晶体结构的新型锗铂化合物。通过X射线衍射和微探针分析研究了晶体结构和组成。磁化率、比热和电阻率测量结果表明，LaPt4Ge12和PrPt4Ge12在8.3 K以下具有超导性。确定了正常态和超导态的参数。发现Pr化合物存在强耦合和晶体电场单重基态。电子结构计算表明费米能级处的态密度很大。SrPt4Ge12和BaPt4Ge12表现出类似行为，但临界温度较低。
