Unconventional magnetic order on the hyperhoneycomb Kitaev lattice in β-Li2IrO3: Full solution via magnetic resonant x-ray diffraction

被引：143

作者：

Biffin, A. ^{[1
]}

Johnson, R. D. ^{[1
]}

Choi, Sungkyun ^{[1
]}

Freund, F. ^{[2
]}

Manni, S. ^{[2
]}

Bombardi, A. ^{[3
]}

Manuel, P. ^{[4
]}

Gegenwart, P. ^{[2
]}

Coldea, R. ^{[1
]}

机构：

[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[2] Univ Augsburg, Ctr Elect Correlat & Magnetism, EP VI, D-86159 Augsburg, Germany

[3] Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England

[4] Rutherford Appleton Lab, ISIS Facil, Harwell Oxford OX11 0QX, England

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 20期

基金：

英国工程与自然科学研究理事会;

关键词：

POLARIZATION DEPENDENCE; SCATTERING;

D O I：

10.1103/PhysRevB.90.205116

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The recently synthesized iridate beta-Li2IrO3 has been proposed as a candidate to display novel magnetic behavior stabilized by frustration effects from bond-dependent, anisotropic interactions (Kitaev model) on a three-dimensional "hyperhoneycomb" lattice. Here we report a combined study using neutron powder diffraction and magnetic resonant x-ray diffraction to solve the complete magnetic structure. We find a complex, incommensurate magnetic order with non-coplanar and counter-rotating Ir moments, which surprisingly shares many of its features with the related structural polytype "stripyhoneycomb" gamma-Li2IrO3, where dominant Kitaev interactions have been invoked to explain the stability of the observed magnetic structure. The similarities of behavior between those two structural polytypes, which have different global lattice topologies but the same local connectivity, are strongly suggestive that the same magnetic interactions and the same underlying mechanism govern the stability of the magnetic order in both materials, indicating that both beta- and gamma-Li2IrO3 are strong candidates to realize dominant Kitaev interactions in a solid state material.

引用

页数：13

共 27 条

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