Issue |
Europhys. Lett.
Volume 35, Number 2, July II 1996
|
|
---|---|---|
Page(s) | 127 - 132 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1996-00543-x | |
Published online | 01 September 2002 |
Spin-glass and non–spin-glass features of a geometrically frustrated magnet
1
Department
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
Received:
9
February
1996
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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