Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials

Details Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials

1995-09-29

arxiv.org/abs/cond-mat/9509181v1

Physics

Condensed Matter

Review Article, Science, TeX file, 18 pages, 6 figures available upon request

Scientific paper

10.1126/science.271.5249.618

One way of making the transition between the quasi-long range order in a chain of S=1/2 spins coupled antiferromagnetically and the true long range order that occurs in a plane, is by assembling chains to make ladders of increasing width. Surprisingly this crossover between one and two dimensions is not at all smooth. Ladders with an even number of legs have purely short range magnetic order and a finite energy gap to all magnetic excitations. Predictions of this novel groundstate have now been verified experimentally. Holes doped into these ladders are predicted to pair, and possibly superconduct.

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