Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δ Superconductor in an Intense Magnetic Field

Yayu Wang, Lu Li, M. J. Naughton, G. D. Gu, S. Uchida, and N. P. Ong
Phys. Rev. Lett. 95, 247002 – Published 5 December 2005

Abstract

In hole-doped cuprates, Nernst experiments imply that the superconducting state is destroyed by spontaneous creation of vortices which destroy phase coherence. Using torque magnetometry on Bi2Sr2CaCu2O8+δ, we uncover a field-enhanced diamagnetic signal M above the transition temperature Tc that increases with applied field to 32 Tesla and scales just like the Nernst signal. The magnetization results above Tc distinguish M from conventional amplitude fluctuations and strongly support the vortex scenario for the loss of phase coherence at Tc.

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  • Received 21 March 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.247002

©2005 American Physical Society

Authors & Affiliations

Yayu Wang1, Lu Li1, M. J. Naughton2, G. D. Gu3, S. Uchida4, and N. P. Ong1

  • 1Department of Physics, Princeton University, New Jersey 08544, USA
  • 2Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
  • 3Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 4School of Frontier Science, University of Tokyo, Tokyo 113-8656, Japan

Comments & Replies

Ong et al. Reply:

N. P. Ong, Yayu Wang, Lu Li, and M. J. Naughton
Phys. Rev. Lett. 98, 119702 (2007)

Comment on “Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δ Superconductor in an Intense Magnetic Field”

Lucía Cabo, Jesús Mosqueira, and Félix Vidal
Phys. Rev. Lett. 98, 119701 (2007)

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Vol. 95, Iss. 24 — 9 December 2005

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