The pseudogap in YBa${}_2$Cu${}_3$O${}_{6+\delta }$ is not bounded by a line of phase transitions - thermodynamic evidence

J. R. Cooper, J. W. Loram, I. Kokanović +2

We discuss a recent resonant ultrasound spectroscopy (RUS) study of YBa${}_2$Cu${}_3$O${}_{6+\delta }$, which infers a line of phase transitions bounding the pseudogap phase and argue that thi…