Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet

被引:52
作者
Matan, K. [1 ,2 ,3 ]
Bartlett, B. M. [4 ,5 ]
Helton, J. S. [1 ,6 ]
Sikolenko, V. [7 ]
Mat'as, S. [8 ]
Prokes, K. [8 ]
Chen, Y. [6 ]
Lynn, J. W. [6 ]
Grohol, D. [9 ]
Sato, T. J. [2 ]
Tokunaga, M. [10 ]
Nocera, D. G. [4 ]
Lee, Y. S. [1 ]
机构
[1] MIT, Dept Phys, Cambridge, MA 02139 USA
[2] Univ Tokyo, Inst Solid State Phys, Neutron Sci Lab, Tokai, Ibaraki 3191106, Japan
[3] Mahidol Univ, Dept Phys, Bangkok 10400, Thailand
[4] MIT, Dept Chem, Cambridge, MA 02139 USA
[5] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA
[6] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[7] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[8] Helmholtz Zentrum Berlin Mat & Energie GmbH, D-14109 Berlin, Germany
[9] Dow Chem Co USA, Core R&D, Midland, MI 48674 USA
[10] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
基金
美国国家科学基金会;
关键词
ANISOTROPIC SUPEREXCHANGE INTERACTION; WEAK FERROMAGNETISM; NEUTRON-SCATTERING; MAGNETIC-STRUCTURE; ORDER; EXCITATIONS; DISORDER;
D O I
10.1103/PhysRevB.83.214406
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin-5/2 kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in the ordered state show a sudden increase at a critical field H-c, indicative of the transition from antiferromagnetic to ferromagnetic states. This sudden increase arises as the spins on alternate kagome planes rotate 180 degrees to ferromagnetically align the canted moments along the field direction. The canted moment on a single kagome plane is a result of the Dzyaloshinskii-Moriya interaction. For H < H-c, the weak ferromagnetic interlayer coupling forces the spins to align in such an arrangement that the canted components on any two adjacent layers are equal and opposite, yielding a zero net magnetic moment. For H > H-c, the Zeeman energy overcomes the interlayer coupling causing the spins on the alternate layers to rotate, aligning the canted moments along the field direction. Neutron scattering measurements provide the first direct evidence of this 180 degrees spin rotation at the transition.
引用
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页数:12
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