Geometrical Frustration in the Ferromagnetic PyrochloreHo2Ti2O7
| Autor: | K W Godfrey, Th. Zeiske, D. F. McMorrow, Steven T. Bramwell, Mark Harris |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Spin glass Condensed matter physics Geometrical frustration Pyrochlore General Physics and Astronomy engineering.material Spin ice chemistry.chemical_compound Ferromagnetism chemistry engineering Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Ising model Dysprosium titanate |
| Zdroj: | Physical Review Letters. 79:2554-2557 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.79.2554 |
| Popis: | We report a detailed study of the pyrochlore ${\mathrm{Ho}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$, in which the magnetic ions $({\mathrm{Ho}}^{3+})$ are ferromagnetically coupled with $J\ensuremath{\sim}1\mathrm{K}$. We show that the presence of local Ising anisotropy leads to a geometrically frustrated ground state, preventing long-range magnetic order down to at least 0.05 K. However, unlike in the case of a frustrated antiferromagnet, this disorder is principally static. In a magnetic field, the ground-state degeneracy is broken and ordered magnetic phases are formed which display an unusual history dependence due to the slow dynamics of the system. These results represent the first experimental evidence for geometrical frustration in a ferromagnetic system. |
| Databáze: | OpenAIRE |
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