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Science 2 February 1996:
Vol. 271. no. 5249, pp. 618 - 623
DOI: 10.1126/science.271.5249.618
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Articles

Surprises on the Way from One- to Two-Dimensional Quantum Magnets: The Ladder Materials

Elbio Dagotto and T. M. Rice

To make the transition from the quasi-long-range order in a chain of antiferromagnetically coupled S = 1/2 spins to the true long-range order that occurs in a plane, one can assemble 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 ground state have now been verified experimentally. Holes doped into these ladders are predicted to pair and possibly superconduct.


E. Dagotto is in the Department of Physics and National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32306, USA. T. M. Rice is with AT&T Bell Laboratories, Murray Hill, NJ 07974, USA, and Theoretische Physik, Eidgenössische Technische Hochschule, 8093 Zürich, Switzerland.


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