Superconductivity of the Ni-based ternary compounds with AlB₂-type structure Y₂NiGe₃ and La₂NiGe₃

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• 作者：J.W. Chen ; ^{jwchen@phys.ntu.edu.tw} ; S.Y. Guan ; C.H. Wang ; S.P. Ho
• 关键词：A. Y2NiGe3 ; A. La2NiGe3 ; D. Superconductivity
• 刊名：Physica C
• 出版年：2012
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：July, 2012
• 卷：477
• 期：Complete
• 页码：63-65
• 文件大小：441 K

摘要

The crystal structure, electrical, and magnetic properties of the Ni-based ternary compounds Y₂NiGe₃ and La₂NiGe₃ have been investigated. Powder X-ray diffraction patterns reveal that both compounds crystallize in the AlB₂-derived hexagonal structure with values of the lattice parameters a = 4.066(7) 脜 and c = 4.025(1) 脜 for Y₂NiGe₃ and a = 4.180(2) 脜 and c = 4.334(1) 脜 for La₂NiGe₃. A sudden drop to zero value in the 蟻(T) curves and the diamagnetic behavior observed in the 蠂_ac(T) curves conform the occurrence of bulk superconductivity in Y₂NiGe₃ and La₂NiGe₃ with T_C of 0.553 K and 0.394 K, respectively. Band structure calculations reveal that superconductivity in these two compounds is most probably from Y 4d electrons and La 5d electrons, respectively.