Electrodynamics of (Nd,Eu,Gd)Ba.sub.2./sub.Cu.sub.3./sub.O.sub.y./sub. single crystals

0387786 - FZÚ 2013 RIV NL eng J - Článek v odborném periodiku
Rameš, Michal - Železný, Vladimír - Ta Phuoc, V. - Gervais, F. - Wolf, T. - Jirsa, Miloš
Electrodynamics of (Nd,Eu,Gd)Ba₂Cu₃O_y single crystals.
Physics Procedia. Roč. 36, č. 2012 (2012), s. 532-537. ISSN 1875-3892
Grant CEP: GA MŠMT(CZ) ME10069
Výzkumný záměr: CEZ:AV0Z10100520
Klíčová slova: optical properties * pseudogap * two-component model * cuprates * memory function
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

ab-plane infrared spectra of two single-crystalline (Nd,Eu,Gd)Ba2Cu3Oy superconductors (NEG-123) with different Gd, Eu ratio were studied. Infrared reflectance was measured between 10 and 300 K at frequencies from 35 to 8000 cm-1. The experimental data were interpreted in terms of the two- and one-component models. The crystal with higher Gd content had more distinguished spectral features (phonons, the middle-infrared band) and about half concentration of charge carriers than the other crystal. We attribute this result to the fact that spectral features are screened by charge carriers and that the screening weakens with decreasing carrier concentration.
Trvalý link: http://hdl.handle.net/11104/0216717