کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1596017 | 1515719 | 2007 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites Weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites](/preview/png/1596017.png)
We have studied a weak charge-ordering behavior in phase separated (Ln1/3Sm2/3)2/3Ca1/3MnO3 (Ln=Pr and La) manganites with same hole doping but slightly different tolerance factors. The M(T)M(T) and ρ(T)ρ(T) curves of the Pr-sample showed an anomaly caused by a weak charge-order (CO) transition at ∼210 K, while that of La-sample did not. However, the La-sample displayed a weak anomaly related to the CO instability in the derivative curve of the temperature dependent magnetoresistance. This result is understood on the basis that the CO phase in La-sample is partly suppressed by a large magnetic field of ∼80 kOe, while in Pr-sample it is not collapsed in that field scale. Our data support the existence of charge-ordering, electronic phase separation and a field-induced reduction of weak CO instability for La-sample, which can contribute towards high MR especially at lower temperatures due to partial melting of CO phase and/or percolation behavior.
Journal: Solid State Communications - Volume 143, Issues 11–12, September 2007, Pages 522–526