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Title: Neutron spin-echo study of the critical dynamics of spin- 5 2 antiferromagnets in two and three dimensions

Abstract

Here, we report a neutron spin-echo study of the critical dynamics in the S= 5 2 antiferromagnets MnF2 and Rb2MnF4 with three-dimensional (3D) and two-dimensional (2D) spin systems, respectively, in zero external field. Both compounds are Heisenberg antiferromagnets with a small uniaxial anisotropy resulting from dipolar spin-spin interactions, which leads to a crossover in the critical dynamics close to the Néel temperature, TN. By taking advantage of the μeV energy resolution of the spin-echo spectrometer, we have determined the dynamical critical exponents z for both longitudinal and transverse fluctuations. In MnF2, both the characteristic temperature for crossover from 3D Heisenberg to 3D Ising behavior and the exponents z in both regimes are consistent with predictions from the dynamical scaling theory. The amplitude ratio of longitudinal and transverse fluctuations also agrees with predictions. In Rb2MnF4, the critical dynamics crosses over from the expected 2D Heisenberg behavior for T » TN to a scaling regime with exponent z = 1.387(4), which has not been predicted by theory and may indicate the influence of long-range dipolar interactions.

Authors:
 [1];  [1];  [2];  [3];  [4]
  1. Max-Planck-Institut fur Festkorperforschung, Stuttgart (Germany); Max Planck Society Outstation at the Forschungsneutronenquelle Heinz Maier-Leibnitz (MLZ), Garching (Germany)
  2. Max-Planck-Institut fur Festkorperforschung, Stuttgart (Germany); Diamond Light Source Ltd., Oxfordshire (United Kingdom)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Max-Planck-Institut fur Festkorperforschung, Stuttgart (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1466698
Alternate Identifier(s):
OSTI ID: 1264792
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Related Information: © 2016 American Physical Society.; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Tseng, K. F., Keller, T., Walters, A. C., Birgeneau, R. J., and Keimer, B. Neutron spin-echo study of the critical dynamics of spin-52 antiferromagnets in two and three dimensions. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.014424.
Tseng, K. F., Keller, T., Walters, A. C., Birgeneau, R. J., & Keimer, B. Neutron spin-echo study of the critical dynamics of spin-52 antiferromagnets in two and three dimensions. United States. https://doi.org/10.1103/PhysRevB.94.014424
Tseng, K. F., Keller, T., Walters, A. C., Birgeneau, R. J., and Keimer, B. Tue . "Neutron spin-echo study of the critical dynamics of spin-52 antiferromagnets in two and three dimensions". United States. https://doi.org/10.1103/PhysRevB.94.014424. https://www.osti.gov/servlets/purl/1466698.
@article{osti_1466698,
title = {Neutron spin-echo study of the critical dynamics of spin-52 antiferromagnets in two and three dimensions},
author = {Tseng, K. F. and Keller, T. and Walters, A. C. and Birgeneau, R. J. and Keimer, B.},
abstractNote = {Here, we report a neutron spin-echo study of the critical dynamics in the S=52 antiferromagnets MnF2 and Rb2MnF4 with three-dimensional (3D) and two-dimensional (2D) spin systems, respectively, in zero external field. Both compounds are Heisenberg antiferromagnets with a small uniaxial anisotropy resulting from dipolar spin-spin interactions, which leads to a crossover in the critical dynamics close to the Néel temperature, TN. By taking advantage of the μeV energy resolution of the spin-echo spectrometer, we have determined the dynamical critical exponents z for both longitudinal and transverse fluctuations. In MnF2, both the characteristic temperature for crossover from 3D Heisenberg to 3D Ising behavior and the exponents z in both regimes are consistent with predictions from the dynamical scaling theory. The amplitude ratio of longitudinal and transverse fluctuations also agrees with predictions. In Rb2MnF4, the critical dynamics crosses over from the expected 2D Heisenberg behavior for T » TN to a scaling regime with exponent z = 1.387(4), which has not been predicted by theory and may indicate the influence of long-range dipolar interactions.},
doi = {10.1103/PhysRevB.94.014424},
journal = {Physical Review B},
number = 1,
volume = 94,
place = {United States},
year = {Tue Jul 19 00:00:00 EDT 2016},
month = {Tue Jul 19 00:00:00 EDT 2016}
}

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Cited by: 6 works
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Figures / Tables:

FIG. 1 FIG. 1: Chemical (top) and magnetic (bottom) structures of (a) MnF2 and (b) Rb2MnF4. In the ordered state, the spins in both compounds are aligned along the tetragonal c-axis.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.