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Macroscopic Signature of Protected Spins in a Dense Frustrated Magnet

Ghosh, S; Rosenbaum, TF; Aeppli, G; (2008) Macroscopic Signature of Protected Spins in a Dense Frustrated Magnet. PHYS REV LETT , 101 (15) , Article 157205. 10.1103/PhysRevLett.101.157205. Green open access

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Abstract

The inability of systems of interacting objects to satisfy all constraints simultaneously leads to frustration. A particularly important consequence of frustration is the ability to access certain protected parts of a system without disturbing the others. For magnets such "protectorates" have been inferred from theory and from neutron scattering, but their practical consequences have been unclear. We show that a magnetic analogue of optical hole-burning can address these protected spin clusters in a well-known, geometrically frustrated Heisenberg system, gadolinium gallium garnet. Our measurements additionally provide a resolution of a famous discrepancy between the bulk magnetometry and neutron diffraction results for this magnetic compound.

Type: Article
Title: Macroscopic Signature of Protected Spins in a Dense Frustrated Magnet
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.101.157205
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.101.157205
Language: English
Additional information: © 2008 The American Physical Society
Keywords: GADOLINIUM GALLIUM GARNET, HUBBARD-MODEL, FERROMAGNETISM, GD3GA5O12, DYNAMICS, SYSTEM, STATE, GLASS, ICE
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 > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/112725
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