Low-Temperature Dynamics of Magnons in a Spin-1/2 Ladder Compound

Nafradi, B.; Keller, T.; Manaka, H.; Zheludev, A.; Keimer, B.

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Low-Temperature Dynamics of Magnons in a Spin-1/2 Ladder Compound

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Keller, T.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Nafradi, B., Keller, T., Manaka, H., Zheludev, A., & Keimer, B. (2011). Low-Temperature Dynamics of Magnons in a Spin-1/2 Ladder Compound. Physical Review Letters, 106(17): 177202.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C169-2

Abstract

We have used a combination of neutron resonant spin-echo and triple-axis spectroscopies to determine the energy, fine structure, and linewidth of the magnon resonance in the model spin-1/2 ladder antiferromagnet IPA-CuCl(3) at temperatures T << Delta(0)/k(B), where Delta(0) is the spin gap at T = 0. In this low-temperature regime we find that the results deviate substantially from the predictions of the nonlinear sigma model proposed as a description of magnon excitations in one-dimensional quantum magnets and attribute these deviations to real-space and spin-space anisotropies in the spin Hamiltonian as well as scattering of magnon excitations from a dilute density of impurities. These effects are generic to experimental realizations of one-dimensional quantum magnets.