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Title

Electron spin resonance shifts in S=1 antiferromagnetic chains

Authors
Maeda, Yoshitaka
Oshikawa, Masaki
Published in Physical Review. B, Condensed Matter. 2013, vol. 87, no. 12, p. 125122
Abstract We discuss electron spin resonance (ESR) shifts in spin-1 Heisenberg antiferromagnetic chains with a weak single-ion anisotropy, based on several effective field theories: the O(3) nonlinear sigma model (NLSM) in the Haldane phase, free-fermion theories around the lower and the upper critical fields. In the O(3) NLSM, the single-ion anisotropy corresponds to a composite operator which creates two magnons at the same time and position. Therefore, even inside a parameter range where free magnon approximation is valid for thermodynamics, we have to take interactions among magnons into account in order to include the single-ion anisotropy as a perturbation. Although the O(3) NLSM is only valid in the Haldane phase, an appropriate translation of Faddeev-Zamolodchikov operators of the O(3) NLSM to fermion operators enables one to treat ESR shifts near the lower critical field in a similar manner to discussions in the Haldane phase. Our theory gives quantitative agreements with a numerical evaluation using quantum Monte Carlo simulation, and also with recent ESR experimental results on a spin-1 chain compound Ni(C5H14N2)2N3(PF6).
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Research group Groupe Giamarchi
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FURUYA, Shunsuke, MAEDA, Yoshitaka, OSHIKAWA, Masaki. Electron spin resonance shifts in S=1 antiferromagnetic chains. In: Physical Review. B, Condensed Matter, 2013, vol. 87, n° 12, p. 125122. https://archive-ouverte.unige.ch/unige:87843

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Deposited on : 2016-09-28

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