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Order by quenched disorder in the model triangular antiferromagnet RbFe(MoO4)2
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Smirnov, A. I., Soldatov, T. A., Petrenko, Oleg, Takata, A., Kida, T., Hagiwara, M., Shapiro, A. Ya. and Zhitomirsky, M. E. (2017) Order by quenched disorder in the model triangular antiferromagnet RbFe(MoO4)2. Physical Review Letters, 119 (4). 047204. doi:10.1103/PhysRevLett.119.047204 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.119.047204
Abstract
We observe a disappearance of the 1/3 magnetization plateau and a striking change of the magnetic configuration under a moderate doping of the model triangular antiferromagnet RbFe(MoO4)2. The reason is an effective lifting of degeneracy of mean-field ground states by a random potential of impurities, which compensates, in the low-temperature limit, the fluctuation contribution to free energy. These results provide a direct experimental confirmation of the fluctuation origin of the ground state in a real frustrated system. The change of the ground state to a least collinear configuration reveals an effective positive biquadratic exchange provided by the structural disorder. On heating, doped samples regain the structure of a pure compound, thus allowing for an investigation of the remarkable competition between thermal and structural disorder.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Antiferromagnetism, Magnetostriction, Rubidium, Iron | ||||||
Journal or Publication Title: | Physical Review Letters | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 0031-9007 | ||||||
Official Date: | 26 July 2017 | ||||||
Dates: |
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Volume: | 119 | ||||||
Number: | 4 | ||||||
Article Number: | 047204 | ||||||
DOI: | 10.1103/PhysRevLett.119.047204 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Copyright Holders: | American Physical Society | ||||||
Date of first compliant deposit: | 14 August 2017 | ||||||
Date of first compliant Open Access: | 14 August 2017 | ||||||
Funder: | Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFFI), Rossiĭskiĭ nauchnyĭ fond [Russian Science Foundation], Ōsaka Daigaku. International Joint Research Promotion Program | ||||||
Grant number: | Grant No.15-02- 05918 (RFFI), Grant No. 17-02-0150 (Rossiĭskiĭ nauchnyĭ fond) |
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