Irreversible Magnetization Deep in the Vortex-Liquid State of a 2D   Superconductor at High Magnetic Fields
  The remarkable phenomenon of weak magnetization hysteresis loops, observed recently deep in the vortex-liquid state of a nearly two-dimensional (2D) superconductor at low temperatures, is shown to reflect the existence of an unusual vortex-liquid state, consisting of collectively pinned crystallites of easily sliding vortex chains. 
T. Maniv, V. Zhuravlev, J. Wosnitza, and J. Hagel