2000/08/31 by L. Benfatto, S. Caprara, C. Castellani +4 · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.63.174513
published as Phys. Rev. B vol.63, p.174513 (2001). · Presentation improved, new references added (10 latex pages, 3 eps figures). submitted to PRB
arxiv created 2000/09/28 · openalex publication_date 2001/04/16 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the effect of dissipation on quantum- and thermal-phase fluctuations in d-wave superconductors. Dissipation, arising from a nonzero low-frequency optical conductivity that has been measured in experiments below Tc, has two effects: (1) a reduction of zero-point phase fluctuations, and (2) a reduction of the temperature at which one crosses over to classical thermal fluctuations. For parameter values relevant to the cuprates, we show that the crossover temperature is still too large for classical phase fluctuations to play a significant role at low temperature. Quasiparticles are thus crucial in determining the linear temperature dependence of the in-plane superfluid stiffness. Thermal phase fluctuations become important at higher temperatures and play a role near Tc.