Thermodynamic signature of a phase transition in the pseudogap phase of $YBa_2Cu_3O_{x}$ high-$T_C$ superconductor

B. Leridon; P. Monod; D. Colson

paper

Thermodynamic signature of a phase transition in the pseudogap phase of $Y B a_{2} C u_{3} O_{x}$ high- $T_{C}$ superconductor

arXiv:0806.2128

Abstract

We present here high precision magnetisation measurements in polycrystalline $Y B a_{2} C u_{3} O_{x}$ 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 $T_{ma g}$ , 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 $Y B a_{2} C u_{3} O_{x}$ .

12 pages, 6 figures, one bibliographic file

Thermodynamic signature of a phase transition in the pseudogap phase of YBa2​Cu3​Ox​ high-TC​ superconductor

Abstract

Thermodynamic signature of a phase transition in the pseudogap phase of $Y B a_{2} C u_{3} O_{x}$ high- $T_{C}$ superconductor