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Geometrical frustration in the ferromagnetic pyrochlore Ho2Ti2O7

Harris, MJ; Bramwell, ST; McMorrow, DF; Zeiske, T; Godfrey, KW; (1997) Geometrical frustration in the ferromagnetic pyrochlore Ho2Ti2O7. PHYS REV LETT , 79 (13) 2554 - 2557.

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Abstract

We report a detailed study of the pyrochlore Ho2Ti2O7, in which the magnetic ions (Ho3+) are ferromagnetically coupled with J similar to 1 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.

Type: Article
Title: Geometrical frustration in the ferromagnetic pyrochlore Ho2Ti2O7
Keywords: SPIN-GLASS, ANTIFERROMAGNET, TB2MO2O7, ORDER, Y2MO2O7, LATTICE, MAGNET
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/143736
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