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We present here high-precision magnetisation measurements in polycrystalline YBa2Cu3Ox samples, with oxygen content ranging from x=6.19 to x=7.00. By analysing the temperature derivative of the susceptibility, we found in the underdoped superconducting samples a singular point at a temperature corresponding to T mag, the temperature below which polarised neutrons experiments have evidenced a symmetry breaking. We believe that this is a thermodynamic indication for the existence of a phase transition in the pseudogap state of underdoped YBa2Cu3Ox.

europhysics letters

Thermodynamic signature of a phase transition in the pseudogap phase of YBa 2 Cu 3 O x high-T C superconductor