期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 857, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158230
关键词
GdFeO3-type perovskites; Crystal structure; High-pressure synthesis; Neutron diffraction; Magnetic structure
资金
- Swiss Spallation Neutron Source SINQ, Paul Scherrer Institute, Switzerland [20180113]
- JSPS KAKENHI [JP20H05276]
- Nippon Sheet Glass Foundation for Materials Science and Engineering [40-37]
- Innovative Science and Technology Initiative for Security from Acquisition, Technology, and Logistics Agency (ATLA), Japan [JPJ004596]
High-pressure synthesis was used to prepare (Ho1-xMnx)MnO3 solid solutions with x = 0.2 and 0.3, showing unique magnetic and structural properties with magnetization reversal behavior below the compensation temperature.
A high-pressure synthesis method was employed to prepare (Ho1-xMnx)MnO3 solid solutions with x = 0.2 and 0.3 (at about 6 GPa and 1,670 K) and magnetic properties and structures were investigated by magnetic, dielectric and neutron diffraction measurements. Both samples crystallize in the GdFeO3-type Prima perovskite structure, and both samples show magnetization reversal behavior below the compensation temperature of about 35 K (at H = 100 Oe). The magnetization reversal phenomena are originated from a ferrimagnetic (FiM) structure which takes place below T-C = 76 K (x = 0.2) and 102 K (x = 0.3) and is built from ferromagnetic (FM) ordering of Mn' and Me cations at the B site which are antiferromagnetically (AFM) coupled with Ho3+ and Mn2+ cations at the A site. The magnetic moment of Ho3+ cations increases significantly with deceasing temperature, and it overcomes the saturated magnetic moment of Mn' and Me cations at the B site. Field-induced first-order transitions were found in both compounds below about 35 K. Neutron diffraction measurements on the x = 0.2 sample found a collinear FiM structure between 76 K and 40 K, and the development of spin canting at the A site below 40 K. The coexistence of Ho3+ and Mn2+ at the A-site gives rise to additional short-range magnetic ordering of Ho3+ and to strain effects along the a-direction which are stronger than in (R1-xMnx)MnO3 materials with heavier and smaller rare-earths cations. (C) 2020 Elsevier B.V. All rights reserved.
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