Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990663 | Journal of Alloys and Compounds | 2018 | 18 Pages |
Abstract
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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
I.O. Troyanchuk, M.V. Bushinsky, N.V. Tereshko, A.N. Vasiliev,