AlPd15B7: a new superconducting cage-compound with an anti-Yb3Rh4Sn13-type of structure.
AlPd15B7: a new superconducting cage-compound with an anti-Yb3Rh4Sn13-type of structure.
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AlPd15B7：一种新型超导笼型化合物，具有反Yb3Rh4Sn13型结构。
DOI：
10.1039/c5dt04751j
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发表时间：
2016
影响因子：
4
通讯作者：
R. Gumeniuk
中科院分区：
文献类型：
--
作者：
Q. Zheng;W. Schnelle;Y. Prots;M. Bobnar;U. Burkhardt;A. Leithe;R. Gumeniuk
采用电弧熔炼法合成了一种新的金属间化合物AlPd_（15）B_7。三元富金属硼化物的单晶X射线衍射数据显示了一种新型的结构，空间群为Ia 3d，晶格常数a = 16.4466（3）<$.它采用了一种填充的反Yb 3Rh 4Sn 13型结构，其中对应于3 Yb，4 Rh和13 Sn原子的位置分别被3 Pd，4 B和1Al + 12 Pd占据，并且3B另外位于间隙位置。磁化率、电阻率和比热测量结果表明该超导体具有临界温度Tc = 2.9 K的体超导性。电子结构计算表明，Pd 4d和B 2 p态在费米能级EF处占主导地位.
A new intermetallic compound AlPd15B7 was synthesized by arc-melting the stoichiometric mixture of the elements. Single crystal X-ray diffraction data of ternary metal-rich boride reveal a new type of structure with the space group Ia3d and the lattice parameter a = 16.4466(3) Å. It adopts a filled anti-Yb3Rh4Sn13-type structure, where the positions corresponding to 3Yb, 4Rh and 13Sn atoms are occupied by 3Pd, 4B, and 1Al + 12 Pd, respectively and 3B additionally at interstitial sites. Magnetic susceptibility, electrical resistivity, and specific heat measurements reveal bulk superconductivity with a critical temperature Tc ≈ 2.9 K. Electronic structure calculations show that Pd 4d and B 2p states dominate the density of states (DOS) at the Fermi level EF.