Non-magnetic Impurities in Spin Gap Systems

Abstract

The effect of non-magnetic impurities is discussed for both the two-leg Heisenberg ladder system and other spin liquids with excitation gap. It is shown that the random depletion of spins introduces a random Berry phase term to the non-linear sigma model. The classical nature of the antiferromagnetic correlation is enhanced by the topological decoherence, and the staggered susceptibility shows more singular behavior at low temperatures than the uniform antiferromagnetic Heisenberg chain.

4 pages, LaTeX, uses jpsj.sty, submitted to J. Phys. Soc. Jpn

References in corpus (7)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Random Quantum Spin Chains: A Real-Space Renormalization Group Study
• Low-Temperature Properties of the Randomly Depleted Heisenberg Ladder
• The Non Linear Sigma Model and Spin Ladders
• Semiclassical description of spin ladders
• Effects of Nonmagnetic Impurity Doping on Spin Ladder System
• Random Exchange Quantum Heisenberg Chains

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