Effect of Lattice Distortion and Cation Size Mismatch on Perovskite Manganites

الموضوعات

علوم بحتة وطبيعية

الملخص

i Based on different models we studied the interplay between thelattice distortion and resistivity in doped colossal magnetoresistancemanganites. The three dimensional La,,,_,Y,Ca0_3MnO6 wherex = 0,0.07,0.1,0.15 was prepared and studied under different magnetic fields upto 9 Tesla. The analysis of the data below the metal-insulator transitiontemperature (TM) showed that cation disorder 0’ played an important role inshifting the TM, towards low temperature on doping. TM, also showedproportional dependence on the ionic radii. Many conduction mechanismswere explored at temperature below 70 K and gave different power lowdependence. Down to 30K a dominant T’ contribution to resistivity wasobserved and which has been ascribed to electron-electron interaction andelectron one magnon interaction. Below 30K unconventional single magnonand two-magnon scattering process were observed. The unconventionalsingle magnon process was observed in samples with less disorder. Uponapplication of magnetic field the contribution of each process to electricalresistivity was observed to vary. The relative weights at different fields foreach sample were estimated.

روابط وملفات

التعريف والنوع

رقم الوثيقة

089eb50e-a805-426f-8e0d-ee608a5c069b

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

63496_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"خنسا أمين مهدي","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"عثمان علي ياسين","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Effect of Lattice Distortion and Cation Size Mismatch on Perovskite Manganites

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

عثمان علي ياسين

الإعداد

خنسا أمين مهدي

الاقتباسات الببليوغرافية