کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1618609 | 1005708 | 2011 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electron spin resonance and resistivity studies of charge-ordered Bi(1âx)SrxMnO3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electron spin resonance and resistivity studies of charge-ordered Bi(1âx)SrxMnO3 Electron spin resonance and resistivity studies of charge-ordered Bi(1âx)SrxMnO3](/preview/png/1618609.png)
چکیده انگلیسی
⺠The temperature dependent electron spin resonance (ESR) and electrical resistivity studies on Bi(1âx)SrxMnO3 (x = 0.3, 0.4, 0.45, and 0.5) were carried out. ⺠The double integrated (DI) intensity of the ESR signal verses temperature and ln DI vs 1000/T plots have been used to get information about magnetic interactions. ⺠The Neel temperature (TN) of the sample is found to increase with increase in Sr content. ⺠In the temperature range T > TN domains of ferromagnetic (FM) and antiferromagnetic (AFM) correlations co-exist. ⺠The contribution of AFM correlations increase with the increase in Sr content. ⺠The observation of weak ESR signal in the temperature range below TN indicates the freezing of FM microdomains/inhomogeneities in the AFM long range ordered state. ⺠The resistivity data is analyzed in view of the polaron model and the Mott's and Efros-Shklovskii variable range hopping (VRH) model of electrical conduction. ⺠As per Motts VRH model, lnÂ Ï varies linearly with Tâ1/4 with a change in slope at TN. The estimated values of hopping distance and localization length are reasonable. ⺠It is also found that lnÂ Ï varies linearly with Tâ1/2 in according with the ES VRH model however the estimated values of the model parameters are unrealistic. ⺠The ESR and resistivity data are also analyzed in view of phase separation (PS) model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 16, 21 April 2011, Pages 5127-5136
Journal: Journal of Alloys and Compounds - Volume 509, Issue 16, 21 April 2011, Pages 5127-5136
نویسندگان
Joji Kurian, R. Singh,