TY - JOUR
T1 - Metal-insulator transition and ferromagnetism phenomena in La 0.7Ce0.3MnO3 thin films
T2 - Formation of Ce-rich nanoclusters
AU - Yanagida, Takeshi
AU - Kanki, Teruo
AU - Vilquin, Bertrand
AU - Tanaka, Hidekazu
AU - Kawai, Tomoji
N1 - Funding Information:
The authors would like to thank the Ministry of Education, Culture, Sports, Science and Technology of Japan for funding and supporting this project through the Center of Excellence (COE) program. Three of the authors (T.Y., T.K., and B.V.) acknowledge financial support from the Japan Society for the Promotion of Science (JSPS). The authors also acknowledge Dr. Kanai for fruitful suggestions.
PY - 2004/11
Y1 - 2004/11
N2 - The nature of metal-insulator transition and ferromagnetism phenomena of perovskite La0.7Ce0.3MnO3 thin films was investigated. In particular, the effects of post-annealing under oxidization and reduction atmospheres on the electrical transport and magnetic properties were systematically examined. The metal-insulator transition temperature and the Curie temperature of ferromagnetism were found to be significantly influenced by the post-annealing and increase with increasing the post-annealing temperature under both oxygen and argon atmospheres. In addition, the major carriers within the conductive films were identified to be holes. Structural and composition analysis clarified that cation deficiencies due to nanoclustering cerium oxides within the post-annealed films are responsible for the emergence of the metal-insulator transition and ferromagnetism phenomena.
AB - The nature of metal-insulator transition and ferromagnetism phenomena of perovskite La0.7Ce0.3MnO3 thin films was investigated. In particular, the effects of post-annealing under oxidization and reduction atmospheres on the electrical transport and magnetic properties were systematically examined. The metal-insulator transition temperature and the Curie temperature of ferromagnetism were found to be significantly influenced by the post-annealing and increase with increasing the post-annealing temperature under both oxygen and argon atmospheres. In addition, the major carriers within the conductive films were identified to be holes. Structural and composition analysis clarified that cation deficiencies due to nanoclustering cerium oxides within the post-annealed films are responsible for the emergence of the metal-insulator transition and ferromagnetism phenomena.
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U2 - 10.1103/PhysRevB.70.184437
DO - 10.1103/PhysRevB.70.184437
M3 - Article
AN - SCOPUS:12144249511
SN - 0163-1829
VL - 70
SP - 1
EP - 9
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 18
M1 - 184437
ER -