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Published October 10, 2008 | Published
Journal Article Open

Macroscopic Signature of Protected Spins in a Dense Frustrated Magnet

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.

Additional Information

© 2008 The American Physical Society. Received 23 April 2008; revised manuscript received 18 August 2008; published 10 October 2008. The work at the University of Chicago was supported by DOE BES under Grant No. DE-FG02-99ER45789. G.A. acknowledges support from the Wolfson Foundation, EPSRC and the Rockefeller Foundation for a stay devoted to this manuscript at the Bellagio Study Center.

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