Mechanism of spin crossover in LaCoO3 resolved by shape magnetostriction in pulsed magnetic fields

被引：35

作者：

Rotter, M. ^{[1
]}

Wang, Z. -S. ^{[2
]}

Boothroyd, A. T. ^{[3
]}

Prabhakaran, D. ^{[3
]}

Tanaka, A. ^{[4
]}

Doerr, M. ^{[5
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Rossendorf Inc, Helmholtz Zentrum Dresden, Hochfeld Magnetlabor Dresden, D-01314 Dresden, Germany

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[4] Hiroshima Univ, ADSM, Higashihiroshima 7398530, Japan

[5] Tech Univ Dresden, Inst Festkorperphys, D-01162 Dresden, Germany

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1038/srep07003

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In the scientific description of unconventional transport properties of oxides (spin-dependent transport, superconductivity etc.), the spin-state degree of freedom plays a fundamental role. Because of this, temperature-or magnetic field-induced spin-state transitions are in the focus of solid-state physics. Cobaltites, e.g. LaCoO3, are prominent examples showing these spin transitions. However, the microscopic nature of the spontaneous spin crossover in LaCoO3 is still controversial. Here we report magnetostriction measurements on LaCoO3 in magnetic fields up to 70 T to study the sharp, field-induced transition at H-c approximate to 60 T. Measurements of both longitudinal and transversal magnetostriction allow us to separate magnetovolume and magnetodistortive changes. We find a large increase in volume, but only a very small increase in tetragonal distortion at H-c. The results, supported by electronic energy calculations by the configuration interaction cluster method, provide compelling evidence that above H-c LaCoO3 adopts a correlated low spin/high spin state.

引用

页数：4

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