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Neutron spin echo study of magnetic fluctuations in the kagome antiferromagnet (D3O)Fe-3(SO4)(2)(OD)(6)
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UNSPECIFIED (1999) Neutron spin echo study of magnetic fluctuations in the kagome antiferromagnet (D3O)Fe-3(SO4)(2)(OD)(6). In: 2nd Workshop on Polarised Neutrons for Condensed Matter Investigations (PNCMI'98), INST LAUE LANGEVIN, CHADWICK AMPHITHEATER, GRENOBLE, FRANCE, SEP 21-23, 1998. Published in: PHYSICA B-CONDENSED MATTER, 267 pp. 145-148. ISSN 0921-4526.
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Abstract
The kagome lattice with antiferromagnetic nearest-neighbour exchange provides a simple example of a geometrically frustrated magnet with a highly degenerate ground state. Theoretical work indicates that the static and dynamic correlations of this magnet are unconventional, with strong fluctuations down to very low temperatures. Deuteronium Jarosite ((D3O)Fe-3(SO4)(2)(OD)(6)) provides a rare example of a suitable model material to test such theory. DC susceptibility studies show strong antiferromagnetic exchange between the S = 5/2 moments (theta(CW) congruent to - 700 K), and a spin-glass transition at T-f congruent to 13 K. We report on neutron spin-echo measurements made on this compound using the polarised neutron spectrometer IN11 at ILL taken with momentum transfer Q = 1.35 Angstrom(-1) for times ranging from 9.7 to 870 ps. The magnetic fluctuations were observed to slow down gradually on cooling through T-f, until they appeared to be static at the shortest experimental timescale at 1.5 K. (C) 1999 Elsevier Science B.V. All rights reserved.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICA B-CONDENSED MATTER | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0921-4526 | ||||
Official Date: | June 1999 | ||||
Dates: |
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Volume: | 267 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 145-148 | ||||
Publication Status: | Published | ||||
Title of Event: | 2nd Workshop on Polarised Neutrons for Condensed Matter Investigations (PNCMI'98) | ||||
Location of Event: | INST LAUE LANGEVIN, CHADWICK AMPHITHEATER, GRENOBLE, FRANCE | ||||
Date(s) of Event: | SEP 21-23, 1998 |
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