Lattice and magnetic instabilities in CaFe2As2:: A single-crystal neutron diffraction study

被引：286

作者：

Goldman, A. I. ^{[1
,2
]}

Argyriou, D. N. ^{[3
]}

Ouladdiaf, B.

Chatterji, T. ^{[4
]}

Kreyssig, A. ^{[1
,2
]}

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

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

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

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

McQueeney, R. J. ^{[1
,2
]}

机构：

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

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

[3] Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany

[4] Inst Max Von Laue Paul Langevin, Forschungszentrum, Julich Outstn, F-38042 Grenoble, France

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.78.100506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron diffraction measurements of a high-quality single crystal of CaFe2As2 are reported. A sharp transition was observed between the high-temperature tetragonal and low-temperature orthorhombic structures at T-S=172.5 K (on cooling) and 173.5 K (on warming). Concomitant with the structural transition, the Fe moments order in a commensurate antiferromagnetic structure with a saturated moment of 0.80(5)mu(B)/Fe directed along the orthorhombic a axis. The hysteresis of both the structural and magnetic transitions is 1 K between cooling and warming, consistent with previous thermodynamic, transport, and single-crystal x-ray studies and provides clear evidence of the coupling between the structural and magnetic transitions in this material.

引用

页数：4

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