Phase diagrams of flux lattices with disorder

We review the prediction, made in a previous work [Phys. Rev. B 52 (1995)], that the phase diagram of type II superconductors consists of a topologically ordered Bragg glass phase at low fields undergoing a transition at higher fields into a vortex glass or a liquid. We estimate the position of the phase boundary using a Lindemann criterion. We find that the proposed phenomenology is compatible with recent experiments on superconductors.Comment: 7 pages 2 figures, uses epsfi

London 2012 (Re)calling: Youth memories and Olympic ‘legacy’ ether in the hinterland

Engendering interest and support among young people was a key strategy for the organisers of the London 2012 Olympic Games. Part of the approach entailed promoting the event as a context and inspirational catalyst to propel young people's proclivities toward, and enduring participation in, sport and physical activity. Although a variety of participatory platforms were entertained, the discipline of physical education remained a favoured space in which enduring Olympic imperatives could be amalgamated with government policy objectives. In this paper data are presented taken from the initial three years of a longitudinal study on young people's engagement with the London 2012 Olympic Games, sport, physical activity and physical education within the UK's West Midlands region. Memory scholarship is brought together with Olympic critiques, legacy debates, youth work and discussions about physical education to conceptualise participants' anticipations and recollections of the London 2012 Olympic Games as a triptych of narrative fragments: each provides insights regarding youth experiences and the remnants of Olympic ether in the country's hinterland. The paper offers a means subsequently to think differently about how we might play with the qualitative sociological/historiographical moments (experiences, voices, accounts, stories, etc.) that we capture in and through our work

Threading dislocation lines in two-sided flux-array decorations

Two-sided flux decoration experiments indicate that threading dislocation lines (TDLs), which cross the entire film, are sometimes trapped in metastable states. We calculate the elastic energy associated with the meanderings of a TDL. The TDL behaves as an anisotropic and dispersive string with thermal fluctuations largely along its Burgers vector. These fluctuations also modify the structure factor of the vortex solid. Both effects can, in principle, be used to estimate the elastic moduli of the material