Phase Fluctuations and the Pseudogap inYBa2Cu3Ox

2000/12/12 by C. Meingast, V. Pasler, Volker Pasler +7 · 1 citation
Physics and Astronomy · #Anisotropy #Condensed matter physics #Cuprate #Doping #Magnetic properties of thin films #Monte Carlo method #Pairing #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Statistics #Superconductivity #Theoretical and Computational Physics #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.86.1606

9 pages, 3 Figures

arxiv created 2000/12/12 · openalex publication_date 2001/02/19 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The thermodynamics of the superconducting transition is studied as a function of doping using high-resolution expansivity data of YBa₂Cu₃O_x single crystals and Monte Carlo simulations of the anisotropic 3D- XY model. We directly show that T_c of underdoped YBa₂Cu₃O_x is strongly suppressed from its mean-field value (T_c^MF) by phase fluctuations of the superconducting order parameter. For overdoped YBa₂Cu₃O_x fluctuation effects are greatly reduced and T_c\ensuremath≈T_c^MF. We find that T_c^MF exhibits a similar doping dependence as the pseudogap energy, naturally suggesting that the pseudogap arises from phase-incoherent Cooper pairing.

Citations

• 3D-XY Critical Fluctuations of the Thermal Expansivity in Detwinned YBa2Cu3O7-δ Single Crystals Near Optimal Doping
• The pseudogap in high-temperature superconductors: an experimental survey

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