PHYSICAL PROPERTIES OF NON-STOICHIOMETRIC OXIDES Superconducting oxides

A. CANEIRO; F. PRADO; A. SERQUIS

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

Akadémiai Kiadó, Budapest, Hungary

Lugar: Budapest; Año: 2006 vol. 83 p. 507 - 518

1388-6150

An important example of oxide materials exhibiting oxygen non-stoichiometry are the high temperature superconductors (HTSC).In this family of materials the variation of the oxygen content modifies the defect structure and the carrier concentration, causingphase transitions and structural distortions with the consequent change in their physical properties. In some systems, a continuousvariation of the physical properties as a function of the oxygen content is observed, while in others, small changes of the oxygencontent strongly modify the superconducting behavior of these materials. In this paper, we review an analysis of the influence of theoxygen content on the physical properties of three HTSC materials: the electron doped Nd?Ce?Cu?O superconductor, theR?Ba?Cu?O (R=Nd, Gd, Pr) 123 compounds and the (Hg, Re)-1201 material.