The Oxygen Deficency Effect of Laser Ablated La_1-xCa_xMnO_z Thin Films

Abstract

It is favorable for the bolometer material used as an uncooled infrared detector device to have large TCR (temperature coefficient of resistance) near room temperature. La_1-xCa_xMnO_z (LCMO) not only shows colossal magnetoresistance, but also has large TCR for the bolometer material. LCMO thin films deposited on LaA10₃ in several conditions by laser ablation method and were measured their resistivities to estimate TCR and analyzed their mechanism for the oxygen deficiency effect. As a result, we have got thin films which show large TCR by changing oxygen pressure in verger and anneal temperature. The oxygen deficiency effect clarifies to us that it is possible to apply LCMO thin films to bolometer materials.