کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990663 | 1516130 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Metamagnetic transition in the system Eu1-xSrxMn0.5Co0.5O3 (0â¯â¤â¯xâ¯â¤â¯0.75)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Magnetic properties of orthorhombic (space group Pnma) perovskite EuMn0.54+Co0.52+O3 synthesized at various temperatures are studied up to 140â¯kOe. The sample obtained at 1500â¯Â°C shows a metamagnetic behavior irreversible below 40â¯K, whereas the sample obtained at 1200â¯Â°C exhibits purely ferromagnetic behavior. Both samples are ordered at Curie temperature TCâ¯=â¯123â¯K and reach equal magnetizations at high magnetic fields. The substitution of Eu3+ by Sr2+ within Eu1-xSrxMn0.5Co0.5O3 series of compounds leads to the increase in TC, but the magnetization of these compositions strongly decreases and the metamagnetic transition disappears at xâ¯>â¯0.3. The composition with xâ¯=â¯0.75 is a cubic (Pm3¯m) antiferromagnet with Neel temperature TNâ¯ââ¯210â¯K. It is assumed that the metamagnetic transition is associated with a transition from a noncollinear into a collinear ferromagnetic phase. A noncollinear phase is formed due to the competition between positive Co2+ - Mn4+ and negative Mn4+ - Mn4+ and Co2+ - Co2+ superexchange interactions in the presence of large magnetic anisotropy. It is suggested that Sr2+ doping leads to formation of mixed high/low spin state of Co3+ ions and enforces antiferromagnetic component.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 359-363
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 359-363
نویسندگان
I.O. Troyanchuk, M.V. Bushinsky, N.V. Tereshko, A.N. Vasiliev,