Structure, charge ordering, and magnetic properties of perovskite Sm 0.5 Ca 0.5 MnO 3 manganite
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Structure, charge ordering, and magnetic properties of perovskite Sm0.5Ca0.5MnO3 manganite Haiou Wang1 · Hui Zhang1 · Kunpeng Su1 · Shuai Huang1 · Weishi Tan2,3 · Dexuan Huo1 Received: 3 June 2020 / Accepted: 12 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Half-doped perovskite Manganese oxide has been widely studied because of its excellent properties such as colossal magnetoresistance (CMR) effect and charge-ordered (CO) phase separation. In this work, four S m0.5Ca0.5MnO3 samples with different particle sizes are prepared by high-temperature solid-state reaction and ball milling. The crystal structure of the samples is studied by X-ray diffraction (XRD). The Sm0.5Ca0.5MnO3 sample is single phase, which belongs to orthorhombic structure. The surface morphology and particle size of the samples are examined by scanning electron microscope (SEM). The average particle size of the sample without ball milling is about 4 μm. With ball milling time for 12 h, 24 h, and 36 h, the particle size decreases, and finally it reaches hundreds to tens of nanometers. This shows that ball milling is an effective way to control the particle size. The M–T curves and M–H hysteresis loops of the samples are measured by physical properties measurements systems (PPMS). The two M–T curves measured in the warming and cooling processes do not overlap for Sm0.5Ca0.5MnO3 without ball milling, and the phenomenon of thermal hysteresis appears. Meanwhile, the M–T curve has a significant protuberance peak near 270 K. All of these indicate the CO behavior, whereas the particle size of S m0.5Ca0.5MnO3 decreases with different milling times (12–36 h) and the CO phase is suppressed gradually, which leads to the decrease of CO temperature, magnetization, remanence, and coercivity.
1 Introduction In the past two decades, people have paid great attention to the attractive characteristics of perovskite manganese oxide such as colossal magnetoresistance (CMR) effect [1–4] and charge-ordered (CO) phenomenon [5–8]. Due to the great potential of CMR in the fields of sensors and hard-disk heads, researchers have done a lot of research on
* Haiou Wang [email protected] * Weishi Tan [email protected] 1
Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, China
2
All‑Solid‑State Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic Engineering, Hunan City University, Yiyang 413002, China
3
Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China
perovskite manganese oxides [9,10]. CO state is the ordered arrangement of M n3+ and M n4+, which is a very attractive characteristic of half-doped perovskite manganite. In general, for half-doped manganite with CO state, the resistivity increases sharply near CO transition temperature (TCO). External disturbances such as radiation, electric
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