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Incommensurate spin dynamics in underdoped cuprate perovskites

โœ Scribed by A. Sherman

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
168 KB
Volume
378-380
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

The incommensurate magnetic response observed in normal-state cuprate perovskites is interpreted based on Mori's projection operator formalism and the t-J model of Cu-O planes. In agreement with experiment, the calculated dispersion of maxima in the susceptibility has the shape of two parabolas with upward-and downward-directed branches which converge at the antiferromagnetic wave vector. The upper parabola reflects the dispersion of magnetic excitations of the localized Cu spins, while the lower parabola arises due to the weakness of the interaction between the spin excitations and holes near the hot spots. Also in conformity with experiment, the low-frequency incommensurability parameter d grows with the hole concentration x for xt0:12 and then saturates.

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