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Journal Article

Theory of the in-plane anisotropy of magnetic excitations in YBa2Cu3O6+y

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Yamase,  H.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Metzner,  W.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Yamase, H., & Metzner, W. (2007). Theory of the in-plane anisotropy of magnetic excitations in YBa2Cu3O6+y. Physica C, 460, 979-980.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B5F2-4
Abstract
A pronounced xy-anisotropy was observed in recent neutron scattering experiments for magnetic excitations in untwinned YBa2-Cu3O6+y (YBCO). The small anisotropy of the bare band structure due to the orthorhombic crystal symmetry seems to be enhanced by correlation effects. A natural possibility is that the system is close to a Pomeranchuk instability associated with a d-wave Fermi surface deformation (dFSD). We investigate this possibility in the bilayer t-J model within a self-consistent slave-boson mean-field theory. We show that the dFSD correlations drive a pronounced xy-anisotropy of magnetic excitations at low doping and at relatively high temperatures, providing a scenario for the observed xy-anisotropy in optimally doped as well as underdoped YBCO, including the pseudogap phase. (c) 2007 Elsevier B.V. All rights reserved.