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Title: Low-temperature relaxation in kagome bilayer antiferromagnets

Abstract

The pyrochlore slab (kagome bilayer) compounds SrCr{sub 9x}Ga{sub 12-9x}O{sub 19} (SCGO; x<1) and Ba{sub 2}Sn{sub 2}ZnCr{sub 7x}Ga{sub 10-7x}O{sub 22} (BSZCGO; x<1), are frustrated systems with quite similar magnetic properties of the spin S = 3/2 Cr{sup 3+} ions. Neutron scattering studies have shown that the two compounds have a completely dynamic magnetic response in a broad temperature range. In both systems the development of short-ranged dynamic correlations leads to a low-T state that can be understood as local clusters with antiferromagnetic character. At liquid He temperatures a partial freezing of the magnetic fluctuations is observed as an increase of the elastic resolved response. A large majority of the magnetic moments remain fluctuating and one also observes a low-energy (long-time) relaxation in the vicinity of the macroscopic freezing. Time and temperature dependence of this relaxation appear system dependent without critical behavior, and we conclude that the freezing is a consequence of the establishment of a coherent quantum state.

Authors:
 [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931399
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the International Conference on Highly Frustrated Magnetism, Osaka, Japan, 15 19 August 2006, Osaka, Japan, 20060815, 20060815
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FLUCTUATIONS; FREEZING; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETISM; NEUTRONS; PYROCHLORE; RELAXATION; SCATTERING; SPIN; TEMPERATURE DEPENDENCE

Citation Formats

Ehlers, Georg. Low-temperature relaxation in kagome bilayer antiferromagnets. United States: N. p., 2007. Web.
Ehlers, Georg. Low-temperature relaxation in kagome bilayer antiferromagnets. United States.
Ehlers, Georg. Mon . "Low-temperature relaxation in kagome bilayer antiferromagnets". United States. doi:.
@article{osti_931399,
title = {Low-temperature relaxation in kagome bilayer antiferromagnets},
author = {Ehlers, Georg},
abstractNote = {The pyrochlore slab (kagome bilayer) compounds SrCr{sub 9x}Ga{sub 12-9x}O{sub 19} (SCGO; x<1) and Ba{sub 2}Sn{sub 2}ZnCr{sub 7x}Ga{sub 10-7x}O{sub 22} (BSZCGO; x<1), are frustrated systems with quite similar magnetic properties of the spin S = 3/2 Cr{sup 3+} ions. Neutron scattering studies have shown that the two compounds have a completely dynamic magnetic response in a broad temperature range. In both systems the development of short-ranged dynamic correlations leads to a low-T state that can be understood as local clusters with antiferromagnetic character. At liquid He temperatures a partial freezing of the magnetic fluctuations is observed as an increase of the elastic resolved response. A large majority of the magnetic moments remain fluctuating and one also observes a low-energy (long-time) relaxation in the vicinity of the macroscopic freezing. Time and temperature dependence of this relaxation appear system dependent without critical behavior, and we conclude that the freezing is a consequence of the establishment of a coherent quantum state.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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