Thermal expansion and anisotropic pressure derivatives of Tc in Ba(Fe1-xCox)2As2 single crystals

被引：56

作者：

Bud'ko, S. L. ^{[1
,2
]}

Ni, N. ^{[1
,2
]}

Nandi, S. ^{[1
,2
]}

Schmiedeshoff, G. M. ^{[3
]}

Canfield, P. C. ^{[1
,2
]}

机构：

[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Occidental Coll, Dept Phys, Los Angeles, CA 90041 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 05期

基金：

美国国家科学基金会;

关键词：

barium compounds; cobalt compounds; iron compounds; specific heat; superconducting materials; superconducting transition temperature; thermal expansion; DEPENDENCE;

D O I：

10.1103/PhysRevB.79.054525

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Heat capacity and anisotropic thermal expansion were measured for Ba(Fe1-xCox)(2)As-2 (x=0,0.038,0.074) single crystals. Thermal expansion is anisotropic and, in tetragonal phase, is significantly higher along the c axis. Previously reported phase transitions, including possibly split structural and magnetic for x=0.038, are clearly seen in both measurements. Uniaxial pressure derivatives of the superconducting transition temperature inferred from the Ehrenfest relation have opposite signs for in-plane and c-axis pressures for both Ba(Fe0.962Co0.038)(2)As-2 and Ba(Fe0.926Co0.074)(2)As-2, with the opposite sign of this anisotropy.

引用

页数：6

共 26 条

[1] Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2 [J].

Ahilan, K. ;

Balasubramaniam, J. ;

Ning, F. L. ;

Imai, T. ;

Sefat, A. S. ;

Jin, R. ;

McGguire, M. A. ;

Sales, B. C. ;

Mandrus, D. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2008, 20 (47)

[2]

Barron T.H.K., 1999, Heat Capacity and Thermal Expansion at Low Temperatures

[3] Anisotropic thermal expansion and magnetostriction of YNi2B2C single crystals [J].

Bud'ko, S. L. ;

Schmiedeshoff, G. M. ;

Lapertot, G. ;

Canfield, P. C. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2006, 18 (35) :8353-8365

[4] Anisotropic thermal expansion and evaluation of uniaxial pressure dependence of superconducting and magnetic transitions in ErNi2B2C [J].

Bud'ko, S. L. ;

Schmiedeshoff, G. M. ;

Canfield, P. C. .

SOLID STATE COMMUNICATIONS, 2006, 140 (06) :281-284

[5] UNIAXIAL PRESSURE-DEPENDENCE OF THE SUPERCONDUCTING CRITICAL-TEMPERATURE IN RBA2CU3O7-DELTA HIGH-TC OXIDES [J].

BUDKO, SL ;

GUIMPEL, J ;

NAKAMURA, O ;

MAPLE, MB ;

SCHULLER, IK .

PHYSICAL REVIEW B, 1992, 46 (02) :1257-1260

[6] GROWTH OF SINGLE-CRYSTALS FROM METALLIC FLUXES [J].

CANFIELD, PC ;

FISK, Z .

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1992, 65 (06) :1117-1123

[7] PROPERTIES OF BOSON-EXCHANGE SUPERCONDUCTORS [J].

CARBOTTE, JP .

REVIEWS OF MODERN PHYSICS, 1990, 62 (04) :1027-1157

[8] Determination of the phase diagram of the electron-doped superconductor Ba(Fe1-xCox)2As2 [J].

Chu, Jiun-Haw ;

Analytis, James G. ;

Kucharczyk, Chris ;

Fisher, Ian R. .

PHYSICAL REVIEW B, 2009, 79 (01)

[9] Post-spinel transformations and equation of state in ZnGa2O4: Determination at high pressure by in situ x-ray diffraction [J].

Errandonea, D. ;

Kumar, Ravhi S. ;

Manjon, F. J. ;

Ursaki, V. V. ;

Rusu, E. V. .

PHYSICAL REVIEW B, 2009, 79 (02)

[10]

GORDON RT, ARXIV08123683

← 1 2 3 →