Magnetic Raman scattering from 1D antiferromagnets

Singh, Rajiv RP and Prelov�ek, Peter and Shastry, Sriram B (1996) Magnetic Raman scattering from 1D antiferromagnets. In: Physical Review Letters, 77 (19). pp. 4086-4089.

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Abstract

We study Raman scattering from 1D antiferromagnets within the Fleury-Loudon scheme by applying a finite temperature Lanczos method to a 1D spin-half Heisenberg model with nearest-neighbor (J(1)) and second-neighbor (J(2)) interactions. The low-temperature spectra are analyzed in terms of the known elementary excitations of the system for J(2) = 0 and J(2) = 1/2. We find that the low-T Raman spectra are very broad for \J(2)/J(1)\ less than or equal to 0.3. This broad peak gradually diminishes and shifts with temperature, so that at T > J(1) the spectra are narrower and peaked at low frequencies. The experimental spectra for CuGeO3 are discussed in light of our calculations.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society .
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	03 May 2011 07:12
Last Modified:	22 Oct 2018 11:56
URI:	http://eprints.iisc.ac.in/id/eprint/37350

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