科研之友
微信
新浪微博
Facebook
分享链接
摘要
Ultrasonic attenuation and phase velocity measurements have been carried out in the ferromagnetic perovskites La2/3Ca1/3MnO3 and La2/3Sr1/3MnO3. Data show that the transition at the Curie temperature T-C changes from first to second order as Sr replaces Ca in the perovskite. The compound with first-order transition shows also another transition at a temperature T-*>T-C. We interpret the temperature window T-C<T<T-* as a region of coexistence of a phase-separated regime of metallic and insulating regions, in the line of recent theoretical proposals.
- 出版日期2003-9-1
