Thermodynamic signature of a phase transition in the pseudogap phase of YBa <sub>2</sub> Cu <sub>3</sub> O <sub>x</sub> high-T <sub>C</sub> superconductor
Brigitte LéridonLaboratoire Photons Et Matière, UPR5/CNRS, ESPCI - 10 rue Vauquelin, 75231 Paris cedex 05, France, EUP. MonodLaboratoire Photons Et Matière, UPR5/CNRS, ESPCI - 10 rue Vauquelin, 75231 Paris cedex 05, France, EUD. ColsonService de Physique de l'Etat Condensé, DSM/IRAMIS, CEA Saclay - 91191 Gif-sur-Yvette Cedex, France, EUA. ForgetService de Physique de l'Etat Condensé, DSM/IRAMIS, CEA Saclay - 91191 Gif-sur-Yvette Cedex, France, EU
2009en
ABI
Abstract
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 Tmag, 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.
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