Metamagnetic transition in the system Eu^sub 1-x^Sr^sub x^Mn^sub 0.5^Co^sub 0.5^O^sub 3^ (0 = x = 0.75)

Magnetic properties of orthorhombic (space group Pnma) perovskite EuMn4+0.5Co2+0.5O3synthesized at various temperatures are studied up to 140 kOe. The sample obtained at 1500 °C shows a metamagnetic behavior irreversible below 40 K, whereas the sample obtained at 1200 °C exhibits purely ferromagneti...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-10, Vol.764, p.359
Main Authors: Troyanchuk, IO, Bushinsky, MV, Tereshko, NV, Vasiliev, AN
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cobalt
Composition
Curie temperature
Ferromagnetic phases
Ferromagnetism
Magnetic anisotropy
Magnetic fields
Magnetic properties
Magnetism
Neel temperature
Perovskites
Phase transitions
Trace elements
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Summary:Magnetic properties of orthorhombic (space group Pnma) perovskite EuMn4+0.5Co2+0.5O3synthesized at various temperatures are studied up to 140 kOe. The sample obtained at 1500 °C shows a metamagnetic behavior irreversible below 40 K, whereas the sample obtained at 1200 °C exhibits purely ferromagnetic behavior. Both samples are ordered at Curie temperature TC = 123 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 x > 0.3. The composition with x = 0.75 is a cubic (Pm3m) antiferromagnet with Neel temperature TN ≈ 210 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.
ISSN:0925-8388
1873-4669