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Structure of spin polarons in the spin-fermion model for CuO2 planes

Jan Bała*

Andrzej M. Oleś

  • Max-Planck-Institut für Physik komplexer Systeme, Noethnitzerstrasse 38, D-01187 Dresden, Federal Republic of Germany
  • Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland

  • Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland

  • *Permanent address.
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Phys. Rev. B 61, 6907 – Published 1 March, 2000

DOI: https://doi.org/10.1103/PhysRevB.61.6907

Abstract

We investigate the spectral functions and various spin-correlation functions relative to the position of the moving oxygen hole in the quantum Néel state formed by copper spins in CuO2 planes. Solving the problem in a self-consistent Born approximation we have found the spectral functions with the sector of Zhang-Rice states coexisting with higher energy oxygen states, which agree qualitatively with the experimental data in insulating Sr2CuO2Cl2. The antiferromagnetic correlations are reduced in the neighborhood of the hole but remain antiferromagnatic and the correlation functions can exhibit similar dipolar distortions as reported in the context of the t−J model. The spectral weight of the quasiparticle decreases as 1/L with increasing size of L×L clusters for the realistic parameters, but remains finite in the thermodynamic limit of CuO2 planes.

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Phys. Rev. B 61, 6907– Published 1 March, 2000
  • Received 1 April 1999

© 2000 American Physical Society

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