A dual vortex lattice – from a phase fluctuating superconductor to a vibrating pair Wigner crystal
Mar 1, 2006
3:30PM to 4:30PM
Date(s) - 01/03/2006
3:30 pm - 4:30 pm
Title: A dual vortex lattice – from a phase fluctuating superconductor to a vibrating pair Wigner crystal
Speaker: Dr. Tami Pereg-Barnea
Institute: University of Texas
Location: ABB 102
The recent discovery of non-dispersing charge modulations in underdoped cuprate superconductors has been explained by the formation of a Cooper pair Wigner crystal . The crystallization is a result of strong phase fluctuations and appear close to and at the pseudogap phase. In this talk I will review the scenario of phase fluctuations and relate it to various experimental results, including dispersing and non-dispersing modulations in the local density of states seen in STM. Specifically, it will be shown how phase fluctuations may lead to crystallization of pairs. This is done by a duality transformation to a condensed state of vortices.
Based on this vortex-boson duality a theoretical picture is suggested to relate the charge modulations and the mysterious increase in the thermal conductivity  recently observed in the underdoped non-superconducting state of YBCO. This addition to the thermal conductivity has bosonic temperature dependence and is attributed within the model to the vibrational modes of the pair Wigner crystal.
 Z. Tesanovic, Phys. Rev. Lett. 93, 217004 (2004).
 L. Taillefer (unpublished).