Magnetic order in lightly doped cuprates: Coherent versus incoherent hole quasiparticles and nonmagnetic impurities

Marijana Kirćan and Matthias Vojta
Phys. Rev. B 73, 014516 – Published 19 January 2006

Abstract

We investigate magnetic properties of lightly doped antiferromagnetic Mott insulators in the presence of nonmagnetic impurities. Within the framework of the tJ model we calculate the doping dependence of the antiferromagnetic order parameter using self-consistent diagrammatic techniques. We show that in the presence of nonmagnetic impurities the antiferromagnetic order is more robust against hole doping in comparison with the impurity-free host, implying that magnetic order can reappear upon Zn doping into lightly hole-doped cuprates. We argue that this is primarily due to the loss of coherence and reduced mobility of the hole quasiparticles caused by impurity scattering. These results are consistent with experimental data on Zn-doped La2xSrxCuO4.

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  • Received 22 August 2005

DOI:https://doi.org/10.1103/PhysRevB.73.014516

©2006 American Physical Society

Authors & Affiliations

Marijana Kirćan1,2 and Matthias Vojta2

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany
  • 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany

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Vol. 73, Iss. 1 — 1 January 2006

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