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Title: Neutron Studies of Tb2Mo2O7

Abstract

We have used the new high energy resolution spectrometer (BaSiS), at the Spallation Neutron Source in Oak Ridge, to conclusively prove the existence of a low energy mode at 0.34(1) meV in the spin glass Tb{sub 2}Mo{sub 2}O{sub 7}. This mode is reminiscent of the excitation observed in the ordered phases of both Tb{sub 2}Ti{sub 2}O{sub 7} and Tb{sub 2}Sn{sub 2}O{sub 7}. The dynamical nature of the transition seen in the magnetization at {approx} 25 K suggests that this frustrated magnet shows a dynamic crossover between a high-temperature phase of poorly correlated, quickly relaxing spins to a low-temperature regime with much slower, short ranged spin correlations extending no further than to the next nearest neighbor. Existing theories explain the spin glass transition in terms of a phase transition and order parameters, and assume the existence of a distinct spin glass phase. There is no evidence for such a phase in Tb{sub 2}Mo{sub 2}O{sub 7}.

Authors:
 [1];  [2];  [3]
  1. Indiana University
  2. ORNL
  3. Oak Ridge National Laboratory (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:
1040735
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Chinese Journal of Physics
Additional Journal Information:
Journal Volume: 50; Journal Issue: 2; Journal ID: ISSN 0577-9073
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ENERGY RESOLUTION; EXCITATION; GLASS; MAGNETIZATION; MAGNETS; NEUTRON SOURCES; NEUTRONS; ORDER PARAMETERS; SPALLATION; SPECTROMETERS; SPIN; SPIN GLASS STATE

Citation Formats

Gardner, Jason, Ehlers, Georg, and Diallo, Souleymane Omar. Neutron Studies of Tb2Mo2O7. United States: N. p., 2012. Web.
Gardner, Jason, Ehlers, Georg, & Diallo, Souleymane Omar. Neutron Studies of Tb2Mo2O7. United States.
Gardner, Jason, Ehlers, Georg, and Diallo, Souleymane Omar. 2012. "Neutron Studies of Tb2Mo2O7". United States.
@article{osti_1040735,
title = {Neutron Studies of Tb2Mo2O7},
author = {Gardner, Jason and Ehlers, Georg and Diallo, Souleymane Omar},
abstractNote = {We have used the new high energy resolution spectrometer (BaSiS), at the Spallation Neutron Source in Oak Ridge, to conclusively prove the existence of a low energy mode at 0.34(1) meV in the spin glass Tb{sub 2}Mo{sub 2}O{sub 7}. This mode is reminiscent of the excitation observed in the ordered phases of both Tb{sub 2}Ti{sub 2}O{sub 7} and Tb{sub 2}Sn{sub 2}O{sub 7}. The dynamical nature of the transition seen in the magnetization at {approx} 25 K suggests that this frustrated magnet shows a dynamic crossover between a high-temperature phase of poorly correlated, quickly relaxing spins to a low-temperature regime with much slower, short ranged spin correlations extending no further than to the next nearest neighbor. Existing theories explain the spin glass transition in terms of a phase transition and order parameters, and assume the existence of a distinct spin glass phase. There is no evidence for such a phase in Tb{sub 2}Mo{sub 2}O{sub 7}.},
doi = {},
url = {https://www.osti.gov/biblio/1040735}, journal = {Chinese Journal of Physics},
issn = {0577-9073},
number = 2,
volume = 50,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}