Unusual Transport Properties near the Insulator-Metal Transition in Colossal Magnetoresistive Manganites

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2005,（1）
• 页码范围: 207-210
• 页数: 4页
• 语种: 英文

摘要

It is argued that a combination of the Griffiths theory and the double-exchange mechanism predicts the random distribution of ferromagnetic metallic clusters above the Curie temperature TC in colossal magnetoresistive manganites. Along this line, we propose a model for the temperature dependence of resistivity that yields a quantitative agreement with experimental data obtained in a typical manganite La2/3Ca1/3MnO3. Our result indicates that the formation and growth of ferromagnetic metallic clusters are responsible for the observation of unusual transport properties near the insulator-metal transition.