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Electron spin resonance modes in a strong-leg ladder in the Tomonaga-Luttinger liquid phase

Publication date2015
Abstract

Magnetic excitations in the strong-leg quantum spin ladder compound (C7H10N)2CuBr4 (known as DIMPY) in the field-induced Tomonaga-Luttinger spin-liquid phase are studied by means of high-field electron spin resonance (ESR) spectroscopy. The presence of a gapped ESR mode with unusual nonlinear frequency-field dependence is revealed experimentally. Using a combination of analytic and exact-diagonalization methods, we compute the dynamical structure factor and identify this mode with longitudinal excitations in the antisymmetric channel. We argue that these excitations constitute a fingerprint of the spin dynamics in a strong-leg spin-1/2 Heisenberg antiferromagnetic ladder and owe their ESR observability to the uniform Dzyaloshinskii-Moriya interaction.

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Citation (ISO format)
OZEROV, M. et al. Electron spin resonance modes in a strong-leg ladder in the Tomonaga-Luttinger liquid phase. In: Physical review. B, Condensed matter and materials physics, 2015, vol. 92, n° 24, p. 241113. doi: 10.1103/PhysRevB.92.241113
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ISSN of the journal1098-0121
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