The first order phase transition and superconductivity in BaNi2As2 single crystals

被引：158

作者：

Ronning, F. ^{[1
]}

Kurita, N. ^{[1
]}

Bauer, E. D. ^{[1
]}

Scott, B. L. ^{[1
]}

Park, T. ^{[1
,2
]}

Klimczuk, T. ^{[1
,3
]}

Movshovich, R. ^{[1
]}

Thompson, J. D. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[3] Gdansk Univ Technol, Fac Appl Phys & Math, PL-80952 Gdansk, Poland

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 34期

关键词：

D O I：

10.1088/0953-8984/20/34/342203

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the synthesis and physical properties of single crystals of stoichiometric BaNi2As2 that crystallizes in the ThCr2Si2 structure with lattice parameters a = 4.112(4) angstrom and c = 11.54(2) angstrom. The resistivity and heat capacity show a first order phase transition at T-0 = 130 K with a thermal hysteresis of 7 K. The Hall coefficient is weakly temperature dependent from room temperature to 2 K where it has a value of -4 x 10(-10) Omega cm Oe(-1). The resistivity, ac susceptibility, and heat capacity provide evidence for bulk superconductivity at T-c = 0.7 K. The Sommerfeld coefficient at Tc is 11.6 +/- 0.9 mJ mol(-1) K-2. The upper critical field is anisotropic with initial slopes of dH(c2)(c)/ dT = -0.19 T K-1 and dH(c2)(ab)/ dT = -0.40 T K-1, as determined from the resistivity.

引用

页数：4

共 18 条

[1] Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO1-xFxFeAs [J].