63Cu and 89YNMR study of an optimally doped YBa2Cu3O6.94 single crystal

T. Auler, M. Horvatić, J. A. Gillet, C. Berthier, Y. Berthier, P. Ségransan, and J. Y. Henry
Phys. Rev. B 56, 11294 – Published 1 November 1997
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Abstract

We report 63Cu spin-spin and spin-lattice relaxation rates (63T21 and 63T11) and 89Y magnetic hyperfine shift (89K) in the normal state of an optimally doped single-crystalline sample YBa2Cu3O6.94 with Tc=93 K (which corresponds to the maximal Tc for the YBa2Cu3O6+x family). The comparison between (63T1T)1 and (63T2g)1 evidences that the spin pseudogap does not open above Tc at optimal doping, although the static spin susceptibility starts to decrease well above Tc, at T0=150 K. Comparing the NMR data of this optimally doped sample with those of two other “90 K” samples previously studied by our group, an underdoped YBa2Cu3O6.92 and an overdoped YBa2C3O7, strongly suggests that the crossover to the spin pseudogap regime occurs precisely at the optimal doping level. A phenomenological phase diagram based on the NMR results in the normal states is proposed. We discuss to which extent our data agree with the predictions of the magnetic scaling theory.

  • Received 3 March 1997

DOI:https://doi.org/10.1103/PhysRevB.56.11294

©1997 American Physical Society

Authors & Affiliations

T. Auler

  • Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970 São Carlos-SP, Brazil
  • Laboratoire de Spectromérie Physique, Université Joseph Fourier Grenoble I, B.P. 87, 38402 St.-Martin d’Hères, France

M. Horvatić

  • Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, B.P. 166, 38042 Grenoble Cedex 9, France

J. A. Gillet

  • Laboratoire de Spectromérie Physique, Université Joseph Fourier Grenoble I, B.P. 87, 38402 St.-Martin d’Hères, France

C. Berthier

  • Laboratoire de Spectromérie Physique, Université Joseph Fourier Grenoble I, B.P. 87, 38402 St.-Martin d’Hères, France
  • Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung
  • Centre National de la Recherche Scientifique, B.P. 166, 38042 Grenoble Cedex 9, France

Y. Berthier and P. Ségransan

  • Laboratoire de Spectromérie Physique, Université Joseph Fourier Grenoble I, B.P. 87, 38402 St.-Martin d’Hères, France

J. Y. Henry

  • Département de Recherche Fondamentale, Centre d’Etudes Nucléaires de Grenoble, B.P. 85X, 38041 Grenoble Cedex, France

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Vol. 56, Iss. 17 — 1 November 1997

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