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Lee, Jun Hee
Quantum Materials for Energy Conversion Lab
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  • Quantum simulation, photocatalyst, fuel cell, Li battery, materials genome, supercomputer

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

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Title
Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate
Author
Ma, JieLee, JunHeeHahn, S. E.Hong, TaoCao, HuiboAczel, Adam A.Dun, ZhilingStone, Matthew B.Tian, WeiQiu, Y.Copley, John R DZhou, HaidongFishman, Randy S.Matsuda, Masaaki
Issue Date
2015-01
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.91, no.2, pp.020407 -
Abstract
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.
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DOI
10.1103/PhysRevB.91.020407
ISSN
2469-9950
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ECHE_Journal Papers
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