Condensed Matter Physics Seminar

Thursday, October 19, 2000, 2 p.m.
Plant Sciences Building, Room 1130

Quantum Vortex Fluctuations and Vortex Superfluidity in Underdoped Cuprates

Hyok-Jon Kwon

(Department of Physics, University of Maryland)

Abstract:  Many of the exotic properties of underdoped cuprate superconducting materials may be attributed to the strong order parameter phase fluctuations, and there exist evidences for strong vortex fluctuations near or above the superconducting transition.  Most notably, the superconductor-insulator transition (SIT) in the underdoped cuprates is possibly driven by the quantum vortex proliferations.  In this scenario, the insulating state is characterised by the Bose-condensation of the vortex loops, which may lead to interesting phenomena such as superfluidity of the magnetic vortices.  I will argue that a broad enough phase fluctuation regime may exist for experimental observation of the vortex fluctuations near SIT, and discuss several experimental consequences.

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