Thermodynamic evidence for the Bose glass transition in twinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ crystals

D. J. Pérez-Morelo, E. Osquiguil, A. B. Kolton +4

We used a micromechanical torsional oscillator to measure the magnetic response of a twinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystal disk near the Bose glass transition. We observe a…