Raman Response in Antiferromagnetic Two-Leg S=1/2 Heisenberg Ladders

Details Raman Response in Antiferromagnetic Two-Leg S=1/2 Heisenberg Ladders Raman Response in Antiferromagnetic Two-Leg S=1/2 Heisenberg Ladders

2001-07-20

arxiv.org/abs/cond-mat/0107431v1

Europhys. Lett. 56, 877 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 4 figures included

Scientific paper

10.1209/epl/i2001-00601-y

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.

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