Spin twists, domain walls, and the cluster spin-glass phase of weakly doped cuprates |
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Authors: | KSD Beach RJ Gooding |
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Institution: | (1) Department of Physics, Queen's University, Kingston, Ontario, Canada K7L 3N6, CA |
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Abstract: | We examine the role of spin twists in the formation of domain walls, often called stripes, by focusing on the spin textures
found in the cluster spin glass phases of and . To this end, we derive improved analytic expressions for the spin distortions produced by a frustrating bond, both near
the core region of the bond and in the far field, and then derive an improved expression for interaction energies between
such bonds. We critique our analytical theory by comparison to numerical solutions of this problem and find excellent agreement.
By looking at collections of small numbers of such bonds localized in some region of a lattice, we demonstrate the stability
of small “clusters” of spins, each cluster having its own orientation of its antiferromagnetic order parameter. Then, we display
a domain wall corresponding to spin twists between clusters of locally ordered spins showing how spin twists can serve as
a mechanism for stripe formation. Since the charges are localized in this model, we emphasize that these domain walls are
produced in a situation for which no kinetic energy is present in the problem.
Received 10 January 2000 |
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Keywords: | PACS 75 50 Lk Spin glasses and other random magnets - 74 72 -h High-Tc compounds |
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