Helical magnetism and structural anomalies in triangular lattice α-SrCr2O4

被引：20

作者：

Dutton, S. E. ^{[1
]}

Climent-Pascual, E. ^{[1
]}

Stephens, P. W. ^{[2
]}

Hodges, J. P. ^{[3
]}

Huq, A. ^{[3
]}

Broholm, C. L. ^{[4
]}

Cava, R. J. ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[3] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2011年 / 23卷 / 24期

关键词：

NEUTRON POWDER DIFFRACTION; NEGATIVE THERMAL-EXPANSION; CRYSTAL-STRUCTURE; ANTIFERROMAGNETS; CU;

D O I：

10.1088/0953-8984/23/24/246005

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

alpha-SrCr2O4 has a triangular planar lattice of d(3) Cr3+ made from edge sharing CrO6 octahedra; the plane shows a very small orthorhombic distortion from hexagonal symmetry. With a Weiss temperature of -596 K and a three-dimensional magnetic ordering temperature of 43 K, the magnetic system is quasi-two-dimensional and frustrated. Neutron powder diffraction shows that the ordered state is an incommensurate helical magnet, with an in-plane propagation vector of k = (0, 0.3217(8), 0). Temperature dependent synchrotron powder diffraction characterization of the structure shows an increase in the inter-plane spacing on cooling below 100 K and an inflection in the cell parameters at the magnetic ordering temperature. These anomalies indicate the presence of a moderate degree of magnetostructural coupling.

引用

页数：8

共 32 条

[1] Helical magnetic state in the distorted triangular lattice of α-CaCr2O4 [J].