Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate

被引：25

作者：

Ma, J. ^{[1
]}

Lee, J. H. ^{[2
]}

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

Hong, Tao ^{[1
]}

Cao, H. B. ^{[1
]}

Aczel, A. A. ^{[1
]}

Dun, Z. L. ^{[3
]}

Stone, M. B. ^{[1
]}

Tian, W. ^{[1
]}

Qiu, Y. ^{[4
,5
]}

Copley, J. R. D. ^{[4
]}

Zhou, H. D. ^{[3
]}

Fishman, R. S. ^{[2
]}

Matsuda, M. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[5] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.91.020407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The crossover from localized to itinerant electron regimes in the geometrically frustrated spinel system Mn1-x CoxV2O4 is explored by neutron-scattering measurements, first-principles calculations, and spin models. At low Co doping, the orbital ordering (OO) of the localized V3+ spins suppresses magnetic frustration by triggering a tetragonal distortion. At high Co doping levels, however, electronic itinerancy melts the OO and lessens the structural and magnetic anisotropies, thus increasing the amount of geometric frustration for the V-site pyrochlore lattice. Contrary to the predicted paramagentism induced by chemical pressure, the measured noncollinear spin states in the Co-rich region of the phase diagram provide a unique platform where localized spins and electronic itinerancy compete in a geometrically frustrated spinel.

引用

页数：5

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