Possible Localized Modes in the Uniform Quantum Heisenberg Chains of Sr2CuO3

Details Possible Localized Modes in the Uniform Quantum Heisenberg Chains of Sr2CuO3 Possible Localized Modes in the Uniform Quantum Heisenberg Chains of Sr2CuO3

2000-04-06

arxiv.org/abs/cond-mat/0004090v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages + 3 figures. To appear in Physical Review B

Scientific paper

10.1103/PhysRevB.62.367

A model of mobile-bond defects is tentatively proposed to analyze the "anomalies" observed on the NMR spectrum of the quantum Heisenberg chains of Sr2CuO3. A bond-defect is a local change in the exchange coupling. It results in a local alternating magnetization (LAM), which when the defect moves, creates a flipping process of the local field seen by each nuclear spin. At low temperature, when the overlap of the LAM becomes large, the defects form a periodic structure, which extends over almost all the chains. In that regime, the density of bond-defects decreases linearly with T.

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