Magnetic correlations on the full chains of ortho-II YBa2Cu3O6.5

W. Chen and P. J. Hirschfeld
Phys. Rev. B 79, 064522 – Published 23 February 2009

Abstract

We propose that the NMR line shape on the chain Cu in the stoichiometric high-Tc superconductor ortho-II YBa2Cu3O6.5 is determined by the magnetization induced on Cu near O vacancies due to strong magnetic correlations in the chains. An unrestricted Hartree-Fock calculation of a coupled chain-plane Hubbard model with nearest-neighbor d-wave pairing interaction shows that the broadening of NMR lines is consistent with disorder-induced magnetization at low temperatures. In addition, we give a possible explanation of the anomalous bimodal line shape observed at high temperatures in terms of nonuniform Cu valence in the chains. The proximity between chains and CuO plane induces anisotropic magnetization on the planar Cu and broadens the plane NMR lines in accordance with that of the chain lines, in agreement with experiment. We discuss implications of the model for other experiments on underdoped YBa2Cu3O7δ.

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  • Received 26 November 2008

DOI:https://doi.org/10.1103/PhysRevB.79.064522

©2009 American Physical Society

Authors & Affiliations

W. Chen1 and P. J. Hirschfeld2

  • 1School of Physics, University of New South Wales, Sydney 2052, Australia
  • 2Department of Physics, University of Florida, Gainesville, Florida 32611, USA

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Issue

Vol. 79, Iss. 6 — 1 February 2009

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