Volume 87, Number 1, July 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 July 2009|
Thermodynamic signature of a phase transition in the pseudogap phase of YBa2Cu3Ox high-TC superconductor
Laboratoire Photons Et Matière, UPR5/CNRS, ESPCI - 10 rue Vauquelin, 75231 Paris cedex 05, France, EU
2 Service de Physique de l'Etat Condensé, DSM/IRAMIS, CEA Saclay - 91191 Gif-sur-Yvette Cedex, France, EU
Corresponding author: firstname.lastname@example.org
Accepted: 24 June 2009
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.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.72.Bk – Y-based cuprates / 74.25.Ha – Magnetic properties
© EPLA, 2009
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