Electron spin resonance in S=1/2 antiferromagnets at high temperature

Details Electron spin resonance in S=1/2 antiferromagnets at high temperature Electron spin resonance in S=1/2 antiferromagnets at high temperature

2010-04-06

arxiv.org/abs/1004.0839v1

Phys. Rev. B 81, 224421 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 10 figures

Scientific paper

We study the electron spin resonance (ESR) of low-dimensional spin systems at high temperature, and test the Kubo-Tomita theory of exchange narrowing. In finite-size systems (molecular magnets), we found a double-peak resonance which strongly differs from the usual Lorentzian. For infinite systems, we have predictions for the linewidth and lineshape as a function of the anisotropy strength. For this, we have used an interpolation between a non-perturbative calculation of the memory function at short times (exact diagonalization) and the hydrodynamic spin-diffusion at long times. We show that the Dzyaloshinskii-Moriya anisotropies generally induce a much larger linewidth than the exchange anisotropies in two dimensions, contrary to the one-dimensional case.

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