Strong competition between orbital-ordering and itinerancy in a frustrated spinel vanadate
| Autor: | Ma, J., Lee, J. H., Hahn, S. E., Hong, Tao, Cao, H. B., Aczel, A. A., Dun, Z. L., Stone, M. B., Tian, W., Qiu, Y., Copley, J. R. D., Zhou, H. D., Fishman, R. S., Matsuda, M. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 91, 020407 (R) (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.91.020407 |
| Popis: | The crossover from localized- to itinerant-electron behavior is associated with many intriguing phenomena in condensed-matter physics. In this paper, we investigate the crossover from localized to itinerant regimes in the spinel system Mn$_{1-x}$Co$_x$V$_2$O$_4$. At low Co doping, orbital order (OO) of the localized electrons on the V3+ ions suppresses magnetic frustration by triggering a tetragonal distortion. With Co doping, electronic itinerancy melts the OO and suppresses the structural phase transition while the reduced spin-lattice coupling produces magnetic frustration. Neutron scattering measurements and first-principles-guided spin models reveal that the non-collinear state at high Co doping is produced by weakened local anisotropy and enhanced Co-V spin interactions. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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