Optical conductivity of high- T c cuprate thin films deposited by multi-target laser ablation

Sandrine Pessaud , François Gervais , Domingos De Sousa , Ricardo Lobo (1) , Corinne Champeaux (2) , Pascal Marchet (3) , Alain Catherinot (2) , Jean Louis Longuet , Frédéric Ravel

1 LPEM - Laboratoire de Physique et d'Etude des Matériaux (UMR 8213)
2 Axe 2 : procédés de traitements de surface
3 Axe 3 : organisation structurale multiéchelle des matériaux

Superconducting cuprate thin films were grown upon MgO single crystals by alternating laser pulses in controlled sequences upon an insulating MCuO2 target (M = Ca, Sr) and a YBa2 Cu3 O7-delta (YBCO) target. The infrared conductivity of the series of films obtained by this multi-target laser ablation technique is deduced from the analysis of infrared reflectivity. The method of fitting by a `double-damping' Drude model is emphasized and applied to cuprate thin films in a situation in which current Kramers-Kronig analysis is hardly applicable. The agreement of experiment and model is found to be as good as for other conducting oxides investigated previously, including those without transition-metal elements. The concentration dependence of the infrared conductivity profile is discussed.

Domaines: Chimie; Matériaux; Sciences de l'ingénieur [physics]; Matériaux

Sandrine Pessaud, François Gervais, Domingos De Sousa, Ricardo Lobo, Corinne Champeaux, et al.. Optical conductivity of high- T c cuprate thin films deposited by multi-target laser ablation. Journal of Physics: Condensed Matter, 2000, 12 (7), pp.1517 - 1525. ⟨10.1088/0953-8984/12/7/332⟩. ⟨hal-01799317⟩