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

Preprint

20 July 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0107431

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.

Keywords

RESPONSE IN ANTIFERROMAGNETIC
ANTIFERROMAGNETIC TWO
HEISENBERG LADDER
RAMAN RESPONSE
COUPLINGS
TWO LEG
LADDER

All Related Versions

Version 1, 2001-07-20, ArXiv
Published version: Europhysics Letters, 56 (6), 877.

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