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
(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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