Cu63-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy

T. Wu, R. Zhou, M. Hirata, I. Vinograd, H. Mayaffre, R. Liang, W. N. Hardy, D. A. Bonn, T. Loew, J. Porras, D. Haug, C. T. Lin, V. Hinkov, B. Keimer, and M.-H. Julien
Phys. Rev. B 93, 134518 – Published 28 April 2016

Abstract

We show that Cu63-NMR spectra place strong constraints on both the nature and the concentration of oxygen defects in ortho-II YBa2Cu3Oy. Systematic deviation from ideal ortho-II order is revealed by the presence of inequivalent Cu sites in either full or empty chains. The results can be explained by two kinds of defects: oxygen clustering into additional chains, or fragments thereof, most likely present at all concentrations (6.4<y<6.6), and oxygen vacancies randomly distributed in the full chains for y<6.50 only. Furthermore, the remarkable reproducibility of the spectra in different samples with optimal ortho-II order (y6.55) shows that chain-oxygen disorder, known to limit electronic coherence, is ineluctable because it is inherent to these compounds.

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  • Received 23 June 2014
  • Revised 30 March 2016

DOI:https://doi.org/10.1103/PhysRevB.93.134518

©2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Wu1,*, R. Zhou1, M. Hirata1, I. Vinograd1, H. Mayaffre1, R. Liang2,3, W. N. Hardy2,3, D. A. Bonn2,3, T. Loew4, J. Porras4, D. Haug4, C. T. Lin4, V. Hinkov4,†, B. Keimer4, and M.-H. Julien1,‡

  • 1Laboratoire National des Champs Magntiques Intenses, CNRS, Université Grenoble Alpes, EMFL, 38042 Grenoble, France
  • 2Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada, V6T 1Z1
  • 3Canadian Institute for Advanced Research, Toronto, Canada
  • 4Max-Planck-Institut for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany

  • *Present address: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China (USTC), Anhui, Hefei 230026, China.
  • Present address: Physikalisches Institut und Röntgen Center for Complex Materials Systems, Universität Würzburg, 97074 Würzburg, Germany.
  • marc-henri.julien@lncmi.cnrs.fr

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Vol. 93, Iss. 13 — 1 April 2016

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