1998/04/03 by Volker Pasler, Peter Schweiss, P. Schweiss +9 · 1 citation
Engineering · Physics and Astronomy · #Acoustic Wave Phenomena Research #Condensed matter physics #Doping #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Thermal #Thermal fluctuations #Thermodynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.81.1094
11 pages including three figures
arxiv created 1998/04/03 · openalex publication_date 1998/08/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The strong coupling of superconductivity to the orthorhombic distortion in YBa2Cu3O_7\ensuremath-\ensuremathδ makes possible an analysis of the superconducting fluctuations without the necessity of subtracting any background. The present high-resolution capacitance dilatometry data unambiguously demonstrate the existence of critical, instead of Gaussian, fluctuations over a wide temperature region (\ifmmode±\else\textpm\fi10K) around Tc. The values of the amplitude ratio A+/A^\ensuremath-\phantom\rule0ex0ex=\phantom\rule0ex0ex0.9--1.1 and the leading scaling exponent |\ensuremathα|\ensuremath≤0.018, determined via a least-squares fit to the data, are consistent with the 3D\ensuremath-XY universality class. Small deviations from pure 3D\ensuremath-XY behavior are discussed.