Electron spin resonance in high-field critical phase of gapped spin chains
Abstract
Motivated by recent experiments on Ni(C2H8N2)2Ni(CN)4 (commonly known as NENC), we study the electron spin resonance in the critical high-field phase of the antiferromagnetic S=1 chain with strong planar anisotropy and show that the ESR spectra exhibit several peculiarities in the critical phase. Possible relevance of those results for other gapped spin systems is discussed.
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