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The J_1-J_2 model revisited : Phenomenology of CuGeO_3 | | V.N. Muthukumar
; Claudius Gros
; Roser Valenti
; M. Weiden
; C. Geibel
; F. Steglich
; P. Lemmens
; M. Fischer
; G. Güntherodt
; | | Date: |
4 Nov 1996 | | Journal: | Phys. Rev. B, Vol. 55, p5944 (1997) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | Dortmund), Claudius Gros (Dortmund), Roser Valenti (Dortmund), M. Weiden (Darmstadt), C. Geibel (Darmstadt), F. Steglich (Darmstadt), P. Lemmens (Aachen), M. Fischer (Aachen), G. Güntherodt (Aachen | | Abstract: | We present a mean field solution of the antiferromagnetic Heisenberg chain with nearest (J_1) and next to nearest neighbor (J_2) interactions. This solution provides a way to estimate the effects of frustration. We calculate the temperature-dependent spin-wave velocity, v_s(T) and discuss the possibility to determine the magnitude of frustration J_2/J_1 present in quasi 1D compounds from measurements of v_s(T). We compute the thermodynamic susceptibility at finite temperatures and compare it with the observed susceptibility of the spin-Peierls compound CuGeO_3. We also use the method to study the two-magnon Raman continuum observed in CuGeO_3 above the spin-Peierls transition. | | Source: | arXiv, cond-mat/9611018 | | Services: | Forum | Review | PDF | Favorites | |
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