Academic
Publications
Relevance of the Phonon-Coupling Mode on the Superconducting Pairing Interaction of La 2− x Sr x CuO 4

Relevance of the Phonon-Coupling Mode on the Superconducting Pairing Interaction of La 2− x Sr x CuO 4,10.1007/s10948-010-0822-9,Journal of Supercondu

Relevance of the Phonon-Coupling Mode on the Superconducting Pairing Interaction of La 2− x Sr x CuO 4  
BibTex | RIS | RefWorks Download
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 Sr x CuO4, 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 Sr x CuO4, 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.
Journal: Journal of Superconductivity and Novel Magnetism - J SUPERCOND NOV MAGN , vol. 24, no. 4, pp. 1273-1280, 2011
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.