Volume 35, Number 2, July II 1996
|Page(s)||127 - 132|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Spin-glass and non–spin-glass features of a geometrically frustrated magnet
of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
2 National Institute of Standards and Technology - Gaithersburg, MD 20899, USA
3 NEC - 4 Independence Way, Princeton, NJ 08540, USA
4 AT&AT Bell Laboratories - 600 Mountain Ave., Murray Hill, NJ 07974, USA
5 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
6 Royal Dutch Shell Laboratories, P.O. Box 3003, 1003 AA Amsterdam, The Netherlands
Accepted: 24 May 1996
We use neutron scattering to show that the low-temperature, short-range ordered spin configuration in the geometrically frustrated magnet (p=0.92(5)) is composed of small groups of spins whose dipole moments cancel. The local magnetic fluctuation spectrum, , vanishes approximately in proportion to ω for , distinguishing this magnet from conventional spin glasses which display a featureless continuum of excited states. We argue that this behavior results from the absence of local, low-energy excitations in the zero-spin clusters from which the frozen spin configuration is composed.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.50.Lk – Spin glasses and other random magnets
© EDP Sciences, 1996
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