caa a22 4500 445380489 CHVBK 20180317143015.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10948-010-0822-9 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0822-9 Relevance of the Phonon-Coupling Mode on the Superconducting Pairing Interaction of La2− x Sr x CuO4 [Elektronische Daten] [H. Ruiz, A. Badía-Majós] Despite the intensive efforts for determining the mechanism that causes high-temperature superconductivity in copper oxide materials (cuprates), no consensus on the pairing mechanism has been reached. Recent advances in angle-resolved photoemission spectroscopies (ARPES) have suggested that a sizeable electron-phonon coupling exists as the principal cause for kinks in the dispersion relations (energy versus wavevector) of the electronic states. Here, we report on a systematic study of the influence of the electron-phonon-coupling parameter "λ” in the electronic quasiparticle dispersions along the nodal direction for La2−x SrxCuO4, covering the entire doping range over which the electron transport properties vary from insulating (0≲x≲0.03) to superconducting (0.05≲x≲0.25) and eventually non-superconducting metal (x>0.25). This includes our recently introduced theoretical model to adjust the experimental data on the fermionic band dispersion. The coupling constant λ, calculated consistently with the nodal kink dispersions, reproduces the observed critical temperatures T c, the gap ratio 2Δ 0/k B T c, and other parameters which have been studied from several equations. Our results suggest that, at least in La2−x SrxCuO4, electron-phonon coupling is the most relevant boson-coupling mode to influence the electron dynamics, and must therefore be included in any microscopic theory of superconductivity. Springer Science+Business Media, LLC, 2010 Kink nationallicence Electron-phonon interaction nationallicence Ruiz H. Departamento de Física de la Materia Condensada - I.C.M.A., Universidad de Zaragoza - C.S.I.C., María de Luna 3, 50018, Zaragoza, Spain aut Badía-Majós A. Departamento de Física de la Materia Condensada - I.C.M.A., Universidad de Zaragoza - C.S.I.C., María de Luna 3, 50018, Zaragoza, Spain aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/4(2011-05-01), 1273-1280 1557-1939 24:4<1273 2011 24 10948 https://doi.org/10.1007/s10948-010-0822-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0822-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ruiz H. Departamento de Física de la Materia Condensada - I.C.M.A., Universidad de Zaragoza - C.S.I.C., María de Luna 3, 50018, Zaragoza, Spain aut NATIONALLICENCE 700 1- Badía-Majós A. Departamento de Física de la Materia Condensada - I.C.M.A., Universidad de Zaragoza - C.S.I.C., María de Luna 3, 50018, Zaragoza, Spain aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/4(2011-05-01), 1273-1280 1557-1939 24:4<1273 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer