Thermodynamic properties of Ba1-xKxFe2As2 and Ca1-xNaxFe2As2

被引：40

作者：

Dong, J. K. ^{[1
,2
]}

Ding, L. ^{[1
,2
]}

Wang, H. ^{[1
,2
]}

Wang, X. F. ^{[3
,4
]}

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

Wu, G. ^{[3
,4
]}

Chen, X. H. ^{[3
,4
]}

Li, S. Y. ^{[1
,2
]}

机构：

[1] Fudan Univ, Surface Phys Lab, Natl Key Lab, Shanghai 200433, Peoples R China

[2] Fudan Univ, Adv Mat Lab, Dept Phys, Shanghai 200433, Peoples R China

[3] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[4] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China

来源：

NEW JOURNAL OF PHYSICS | 2008年 / 10卷

关键词：

D O I：

10.1088/1367-2630/10/12/123031

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat C(T) of a BaFe2As2 single crystal and hole-doped superconducting Ba0.5K0.5Fe2As2 and Ca0.5Na0.5Fe2As2 polycrystals were measured. For the undoped BaFe2As2 single crystal, a very sharp specific heat peak was observed at 136 K. This is attributed to the structural and antiferromagnetic transitions occurring at the same temperature. For the superconducting Ba0.5K0.5Fe2As2 polycrystal, a clear peak of C/T was observed at T-c = 36 K, which is the highest peak seen at a superconducting transition for iron-based high-T-c superconductors so far. For the superconducting Ca0.5Na0.5Fe2As2 sample with lower T-c = 18 K, there is no obvious anomaly in C/T below T-c, which may be due to its low superfluid density. The electronic specific heat coefficients gamma and Debye temperatures Theta(D) of these compounds were obtained from the low-temperature data.

引用

页数：7

共 27 条

[1] High pressure synthesis of late rare earth RFeAs(O,F) superconductors; R = Tb and Dy [J].