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mu SR studies of the kagome antiferromagnet (H3O)Fe-3(OH)(6)(SO4)(2)
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UNSPECIFIED (2000) mu SR studies of the kagome antiferromagnet (H3O)Fe-3(OH)(6)(SO4)(2). In: 8th International Conference on Muon Spin Rotation, Relaxation and Resonance, LES DIABLERETS, SWITZERLAND, AUG 30-SEP 03, 1999. Published in: PHYSICA B-CONDENSED MATTER, 289 pp. 217-220. ISSN 0921-4526.
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Abstract
The Heisenberg kagome antiferromagnet is a frustrated system that provides a simple model for the study of strongly fluctuating magnets with a highly degenerate ground state. Hydronium jarosite, (H3O)Fe-3(OH)(6)(SO4)(2) possesses a kagome lattice of Fe3+ ions that behave as S = 5/2 Heisenberg moments coupled through strong antiferromagnetic exchange. DC susceptibility measurements reveal a spin-glass-like transition at T-f congruent to 15 K. We have performed muon-spin relaxation (mu SR) measurements on this material to elucidate the nature of this transition. Well above T-f, the muon depolarisation adopts a simple exponential form, becoming a stretched exponential with exponent beta approaching 0.5 as T --> T-f. On cooling further, beta drops further to 1/3, and the depolarisation adopts a dynamic Kubo-Toyabe form which may be decoupled by applied longitudinal fields of the order of 5 kC. We estimate the upper limit of the static component of the moment to be 3.4 mu(B) per iron ion, compared with a value of congruent to 5.92 mu(B) expected for high-spin Fe3+. (C) 2000 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: | August 2000 | ||||
Dates: |
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Volume: | 289 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 217-220 | ||||
Publication Status: | Published | ||||
Title of Event: | 8th International Conference on Muon Spin Rotation, Relaxation and Resonance | ||||
Location of Event: | LES DIABLERETS, SWITZERLAND | ||||
Date(s) of Event: | AUG 30-SEP 03, 1999 |
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