Superconductivity in the Ni based ternary carbide LaNiC2

被引：81

作者：

Lee, WH ^{[1
]}

Zeng, HK ^{[1
]}

Yao, YD ^{[1
]}

Chen, YY ^{[1
]}

机构：

[1] ACAD SINICA,INST PHYS,TAIPEI 11529,TAIWAN

来源：

PHYSICA C | 1996年 / 266卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(96)00309-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electrical-resistivity, magnetic-susceptibility and specific-heat data reveal that the bulk phase transition at 2.63 similar to 2.86 K (10 similar to 90% values) in LaNiC2 is to a superconducting ground state. The normal-state specific-heat data can be fitted to the expression C-n = gamma T + beta T-3 (3 K < T < 7 K) by a least-squares analysis, where gamma = 7.83 mJ/mol K-2 and beta = 0.0635 mJ/mol K-4, resulting in a Debye temperature theta(D) = 496 K. A special emphasis is on the specific heal in the superconducting state below 1.6 K; C-s is not exponential but has a power-law form: C-s approximate to 3.5(gamma T-c)(T/T-c)(3). According to the observed specific-heat data, we suggest that LaNiC2 belongs to a nonconventional BCS superconductor. In addition, LaNiC2 is the first nickel-based ternary-carbide superconductor.

引用

页码：138 / 142

页数：5

共 36 条

[21] TOWARD A THEORY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN THE ANTIFERROMAGNETICALLY CORRELATED CUPRATE OXIDES [J].