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Title: Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr 9xGa 12−9xO 19

Abstract

A neutron spin-echo investigation of the low temperature spin dynamics in two well-characterized kagome bilayer compounds SrCr{sub 9x}Ga{sub 12-9x}O{sub 19} (x = 0.95, SCGO) and Ba{sub 2}Sn{sub 2}ZnCr{sub 7x}Ga{sub 10-7x}O{sub 22} (x = 0.97, BSZCGO) reveals two novel features. One is the slowing down of the relaxation rate without critical behavior at T{sub g}, where a macroscopic spin-glass-like freezing occurs. The second is, in SCGO at 4 K ({approx} T{sub g}) < T < 7 K, the relaxation rate activation energy E{sub a} = 7 {+-} 0.4 meV, equal to the energy of a phonon mode, pointing out the role of spin-lattice coupling.

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:
1003588
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACTIVATION ENERGY; BARIUM COMPOUNDS; CHROMIUM COMPOUNDS; FREEZING; GALLIUM OXIDES; LAYERS; MAGNETS; NEUTRONS; PHONONS; RELAXATION; SLOWING-DOWN; SPIN; SPIN ECHO; STRONTIUM COMPOUNDS; TIN COMPOUNDS; ZINC COMPOUNDS

Citation Formats

Ehlers, Georg. Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr9xGa12−9xO19. United States: N. p., 2006. Web.
Ehlers, Georg. Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr9xGa12−9xO19. United States.
Ehlers, Georg. Sun . "Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr9xGa12−9xO19". United States. doi:.
@article{osti_1003588,
title = {Slow Spin-Dynamics in kagom?-bilayer Frustrated Magnets - evidence for phonon assisted relaxation in SrCr9xGa12−9xO19},
author = {Ehlers, Georg},
abstractNote = {A neutron spin-echo investigation of the low temperature spin dynamics in two well-characterized kagome bilayer compounds SrCr{sub 9x}Ga{sub 12-9x}O{sub 19} (x = 0.95, SCGO) and Ba{sub 2}Sn{sub 2}ZnCr{sub 7x}Ga{sub 10-7x}O{sub 22} (x = 0.97, BSZCGO) reveals two novel features. One is the slowing down of the relaxation rate without critical behavior at T{sub g}, where a macroscopic spin-glass-like freezing occurs. The second is, in SCGO at 4 K ({approx} T{sub g}) < T < 7 K, the relaxation rate activation energy E{sub a} = 7 {+-} 0.4 meV, equal to the energy of a phonon mode, pointing out the role of spin-lattice coupling.},
doi = {},
journal = {Physical Review Letters},
number = 4,
volume = 97,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}