Phys. Rev. Lett. 95, 247002 (2005) [4 pages]Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δ Superconductor in an Intense Magnetic FieldReceived 21 March 2005; published 5 December 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.247002
DOI:
10.1103/PhysRevLett.95.247002
PACS:
74.25.Dw, 74.25.Ha, 74.72.Hs
See AlsoComment: Lucía Cabo, Jesús Mosqueira, and Félix Vidal, Comment on “Field-Enhanced Diamagnetism in the Pseudogap State of the Cuprate Bi2Sr2CaCu2O8+δ Superconductor in an Intense Magnetic Field”, Phys. Rev. Lett. 98, 119701 (2007). Reply: N. P. Ong, Yayu Wang, Lu Li, and M. J. Naughton, Ong et al. Reply:, Phys. Rev. Lett. 98, 119702 (2007). |
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