کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8163585 | 1525232 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Resistive transition, polaron dynamics and scaling behavior in Fe doped SrTiO3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Temperature dependent electrical transport (ac and dc) and dielectric measurements have been performed with SrFexTi(1âx)O3 (0â¤xâ¤1.0) samples prepared by ceramic route. Metal-insulator like transition observed depending on doping concentration. High dc resistivity of the present system is due to localization of polaronic charge carriers and the dc resistivity data, above respective TMI, fit well with Mott's variable range hopping, Arrhenius conduction mechanism, while a power law nature is followed below TMI. The charge transport mechanism is also revealed from the scaled ac conductivity and dielectric modulus spectrum. The MI transition is considered to be associated with polaron dissociation occurring little below polaron ordering (PO) temperature, TPO. The samples also indicate a cross-over from universal dielectric response (UDR) (f<105 Hz) to second universality (SU) (f>105 Hz). This cross over as well as MI like transition temperature shift towards the lower temperature regime with increasing x.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 414, 1 April 2013, Pages 60-66
Journal: Physica B: Condensed Matter - Volume 414, 1 April 2013, Pages 60-66
نویسندگان
Arijit Ghosh, Md.G. Masud, Jhuma Sannigrahi, B.K. Chaudhuri,