کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1594470 1515671 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of hole doping and antiferromagnetic coupling on the itinerant ferromagnetism of SrRuO3 through Cu substitution at Ru site
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Effect of hole doping and antiferromagnetic coupling on the itinerant ferromagnetism of SrRuO3 through Cu substitution at Ru site
چکیده انگلیسی

Systematic studies on the structural, transport and magnetic properties of SrRu1−xCuxO3 (x=0.0–0.2)(x=0.0–0.2) compounds have been performed. SrRu0.8Cu0.2O3 shows a tetragonal structure unlike the other compositions which exhibit a pseudo-cubic structure. Low temperature powder X-ray diffraction data of SrRu0.8Cu0.2O3 collected at a synchrotron beam line reveals that the tetragonal structure is stable down to 8 K. Ferromagnetic transition temperatures (Tc)(Tc) are significantly reduced from 160 to 34 K with Cu doping. All the compositions exhibit irreversibilities in MZFC(T) and MFC(T  ) curves ascribable to the presence of domain structures. Magnetic susceptibility measurements show that the copper ions are anti-ferromagnetically coupled for concentrations higher than x=0.16x=0.16. The antiparallel arrangement of Ru5+ ions with its neighboring cations also contributes to the large reduction in the observed magnetic moment. X-ray photoemission spectroscopy measurements show evidence for both tetravalent and pentavalent Ru ions while copper is in a divalent state. We conclude from our resistivity data that Cu2+ substitution promotes a polaronic type of conductivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 149, Issues 39–40, October 2009, Pages 1674–1678
نویسندگان
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