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Of the many different kinds of glassy states found in nature, spin glassesand structural glasses (e.g. normal window glass) have probably received themost attention. One of the central questions concerning the glassy state iswhether the "glass" is a distinct thermodynamic phase from the "liquid" phase.It is believed that this may actually be the case for spin glasses, whereas theglass transition in structural glasses appears to be mostly kinetic in nature.Supercooled structural liquids, however, exhibit a wide range of behaviors,which can be classified using the "strong-fragile" scheme of Angell, where theterms "strong" and "fragile" refer to Arrhenius and highly non-Arrheniusrelaxation behaviors, respectively. For the extremely fragile liquids, athermodynamic origin of the glass transition cannot be ruled out. A microscopicunderstanding of the complexity leading to different degrees of fragility andaffecting the kinetic glass transition is, however, lacking. Also theconnection, if any, between the different kind of glass states (spin,structural, etc.) is unclear. Here we examine the glassy behavior of a noveltype of matter, namely the vortex matter in the high-temperature superconductor(HTSC) YBa2Cu3Ox

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ