Magnetic Raman scattering from 1D antiferromagnets

Singh, Rajiv R. P. ; Prelovšek, Peter ; Sriram Shastry, B. (1996) Magnetic Raman scattering from 1D antiferromagnets Physical Review Letters, 77 (19). pp. 4086-4089. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v77/i19/p4086_1

Related URL: http://dx.doi.org/10.1103/PhysRevLett.77.4086

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 ( J1) and second-neighbor ( J2) interactions. The low-temperature spectra are analyzed in terms of the known elementary excitations of the system for J2 = 0 and J2 = ½. We find that the low- T Raman spectra are very broad for |J2/J1|≤0.3. This broad peak gradually diminishes and shifts with temperature, so that at T > J1 the spectra are narrower and peaked at low frequencies. The experimental spectra for CuGeO3 are discussed in light of our calculations.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:51246
Deposited On:28 Jul 2011 07:18
Last Modified:18 May 2016 05:16

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