Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate
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- Strong competition between orbital ordering and itinerancy in a frustrated spinel vanadate
- Ma, Jie; Lee, JunHee; Hahn, S. E.; Hong, Tao; Cao, Huibo; Aczel, Adam A.; Dun, Zhiling; Stone, Matthew B.; Tian, Wei; Qiu, Y.; Copley, John R D; Zhou, Haidong; Fishman, Randy S.; Matsuda, Masaaki
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW B, v.91, no.2, pp.020407 -
- 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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