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Raman Response in Antiferromagnetic Two-Leg S=1/2 Heisenberg Ladders | | Kai P. Schmidt
; Christian Knetter
; Götz S. Uhrig
; | | Date: |
20 Jul 2001 | | Journal: | Europhys. Lett. 56, 877 (2001) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | The Raman response in the antiferromagnetic 2-leg S=1/2 Heisenberg ladder is calculated for various couplings by continuous unitary transformations. For leg couplings above 80% of the rung coupling a characteristic 2-peak structure occurs with a point of zero intensity within the continuum. Experimental data for CaV_2O_5 and La_yCa_(14-y)Cu_24O_41 are analyzed and the coupling constants are determined. Evidence is found that the Heisenberg model is not sufficient to describe cuprate ladders. We argue that a cyclic exchange term is the appropriate extension. | | Source: | arXiv, cond-mat/0107431 | | Services: | Forum | Review | PDF | Favorites | |
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