Spin waves in antiferromagnetic spin chains with long-range interactions

Yusuf, E., Joshi, A. and Yang, K. (2004) Spin waves in antiferromagnetic spin chains with long-range interactions. Physical Review B, 69 14: 144412-1-144412-7. doi:10.1103/PhysRevB.69.144412

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Author Yusuf, E.
Joshi, A.
Yang, K.
Title Spin waves in antiferromagnetic spin chains with long-range interactions
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2004
Year available 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevB.69.144412
Open Access Status File (Publisher version)
Volume 69
Issue 14
Start page 144412-1
End page 144412-7
Total pages 7
Place of publication College Pk
Publisher American Physical Society
Language eng
Subject 240500 Classical Physics
Abstract We study antiferromagnetic spin chains with unfrustrated long-range interactions that decay as power laws with exponent beta, using the spin-wave approximation. We find for sufficiently large spin S that the Neel order is stable at T=0 for beta<3, and survives up to a finite Neel temperature for beta<2, validating the spin-wave approach in these regimes. We estimate the critical values of S and T for the Neel order to be stable. The spin-wave spectra are found to be gapless but have nonlinear momentum dependence at long wavelength, which is responsible for the suppression of quantum and thermal fluctuations and stabilizing the Neel state. We also show that for betaless than or equal to1 and for a large but finite-size system size L, the excitation gap of the system approaches zero slower than L-1, a behavior that is in contrast to the Lieb-Schultz-Mattis theorem.
Keyword Physics, Condensed Matter
Ferromagnetic Interactions
Models
State
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 28 Mar 2008, 15:25:10 EST