Superconducting properties and electronic structure of NaBi

被引：24

作者：

Kushwaha, S. K. ^{[1
]}

Krizan, J. W. ^{[1
]}

Xiong, J. ^{[2
]}

Klimczuk, T. ^{[3
,4
]}

Gibson, Q. D. ^{[1
]}

Liang, T. ^{[2
]}

Ong, N. P. ^{[2
]}

Cava, R. J. ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[3] Gdansk Univ Technol, Fac Appl Phys & Math, PL-80233 Gdansk, Poland

[4] Pomeranian Univ, Inst Phys, PL-76200 Slupsk, Poland

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2014年 / 26卷 / 21期

关键词：

superconducting properties; heat capacity; resistivity; Meissner effect; electronic band structure; TEMPERATURE;

D O I：

10.1088/0953-8984/26/21/212201

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Resistivity, dc magnetization, and heat capacity measurements are reported for superconducting NaBi. T-c, the electronic contribution to the specific heat gamma, the Delta C-p/gamma T-c ratio, and the Debye temperature are found to be 2.15 K, 3.4 mJ mol(-1) K-2, 0.78, and 140 K respectively. The calculated electron-phonon coupling constant (lambda(ep) = 0.62) implies that NaBi is a moderately coupled superconductor. The upper critical field and coherence length are found to be 250Oe and 115nm, respectively. Electronic structure calculations show NaBi to be a good metal, in agreement with the experiments; the p(x) and p(y) orbitals of Bi dominate the electronic states at the Fermi Energy.

引用

页数：5

共 17 条

[1] Superconducting and normal-state properties of APd2As2 (A = Ca, Sr, Ba) single crystals [J].