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Richard T. Scalettar

Publications and source records attributed to Richard T. Scalettar.

93 records · Page 6Linked to original sources
arXiv1996

The Moving Glass Phase of Dirty Type II Superconductors

We study numerically the motion of vortices in dirty type II superconductors. In two dimensions at strong driving currents, vortices form highly correlated ``static channels''. The static structure factor exhibits convincing scaling behaviour, demonstrating quasi long range translational order in the transverse direction. However order in the longitudinal direction is only short range. We clearly establish the existence of a finite transverse critical current, suggesting strong barriers against small transverse driving forces. These results are most consistently interpreted in terms of the recently proposed moving glass picture, modified to account for the strong anisotropy.

cond-mat↗
arXiv1996

Theory for Quantum Spin and Vortex Glasses

We develop a theory for the quantum vortex glass, with both the coupling strengths and the site energies disordered. This model is closely related to XY spin glasses and bosons in random media. For properly chosen distributions of the site disorder the phase diagram consists of a superfluid phase, and Weak and Strong Glass regions, dominated by long range and local fluctuations, respectively. The most direct experimental manifestation of the Strong Glass transition is the lack of divergence of the corresponding non-linear susceptibility.

cond-mat↗
arXiv1995

Superconductor-Insulator Transition in a Disordered Electronic System

We study an electronic model of a 2D superconductor with onsite randomness using Quantum Monte Carlo simulations. The superfluid density is used to track the destruction of superconductivity in the ground state with increasing disorder. The non-superconducting state is identified as an insulator from the temperature dependence of its d.c. resistivity. The value of $σ_{\rm dc}$ at the superconductor-insulator transition appears to be non-universal.

cond-mat↗