caa a22 4500 467884463 CHVBK 20180406152730.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10948-006-0145-z doi (NATIONALLICENCE)springer-10.1007/s10948-006-0145-z Crossover Effects in the Nonlinear σ-Model with Damping [Elektronische Daten] [M. Crisan, I. Grosu] We study the behavior of the nonzero temperature quantum nonlinear sigma model in d = 2 dimensions at finite temperatures in the presence of the damping term. Using the renormalization group (RG) method we calculated the effect of the finite temperature on the magnetic coherence length and the damping of the fluctuations. The results have been used to calculate the relaxation rates from nuclear magnetic resonance, which have been analyzed phenomenologically by different authors in order to get the phase diagram in the doped cuprate superconductors. Our calculations showed a good agreement with the experimental data, but we also evaluated the corrections which appear due to a more accurate analysis performed using the RG method. Springer Science + Business Media, Inc., 2007 nonlinear sigma model nationallicence HTCS nationallicence NMR relaxation times nationallicence Crisan M. Department of Theoretical Physics, University of Cluj, 3400, Cluj-Napoca, Romania aut Grosu I. Department of Theoretical Physics, University of Cluj, 3400, Cluj-Napoca, Romania aut Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/6(2006-08-01), 489-495 1557-1939 19:6<489 2006 19 10948 https://doi.org/10.1007/s10948-006-0145-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-006-0145-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Crisan M. Department of Theoretical Physics, University of Cluj, 3400, Cluj-Napoca, Romania aut NATIONALLICENCE 700 1- Grosu I. Department of Theoretical Physics, University of Cluj, 3400, Cluj-Napoca, Romania aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 19/6(2006-08-01), 489-495 1557-1939 19:6<489 2006 19 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer