Destruction of charge ordering phase in La0.4Ca0.6MnO3 induced by low Cr doping
来源期刊：Rare Metals2011年第3期
论文作者：PENG Zhenshenga, b, YANG Ganga, c, WANG Guiyinga, c, TANG Yongganga, c, GUO Huanyina, c, and MAO Qianga, c a Anhui Key Laboratory of Spintronic and Nanometric Materials Cultivating Base, Suzhou College, Suzhou , China b Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei , China c Department of Electronics and Electric Engineering, Suzhou College, Suzhou , China
文章页码：241 - 246
摘 要：Polycrystalline samples of La0.4Cao.6Mn1-xCrxO3 （x = 0.00, 0.02, 0.04, 0.06） were prepared by the solid state reaction method. The influence of Cr3+ substitution for Mn3+ on the magnetic property and charge ordering phase of La0.4Ca0.6MnO3 was studied through the measurements of X-ray diffraction （XRD）, magnetization-temperature （M-T） curves and electron spin resonance （ESR） spectra. The experimental results indicate that the mother’s body of La0.4Ca0.6MnO3 has very complicated magnetic structure, exhibits charge ordering phase at 258 K, and shows long-range strongly correlated charge ordering-antiferromagnetism （CO-AFM） phase from 175 to 50 K. Spin glass state appears when the temperature decreases to about 41 K. When the Cr substitution amount is x = 0.06, the charge ordering phase of the mother’s body is de-stroyed, because the Cr3+ substitution for Mn3+ destroys the spin order of CE-type antiferromagnetism, and thus leads to the melting of charge ordering. It is verified experimentally that the strong coupling between charge order and spin order exists in the charge order system of CE-type antiferromagnetism.
PENG Zhenshenga, b, YANG Ganga, c, WANG Guiyinga, c, TANG Yongganga, c, GUO Huanyina, c, and MAO Qianga, c a Anhui Key Laboratory of Spintronic and Nanometric Materials Cultivating Base, Suzhou College, Suzhou 234000, China b Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China c Department of Electronics and Electric Engineering, Suzhou College, Suzhou 234000, China
摘 要：Polycrystalline samples of La0.4Cao.6Mn1-xCrxO3 （x = 0.00, 0.02, 0.04, 0.06） were prepared by the solid state reaction method. The influence of Cr3+ substitution for Mn3+ on the magnetic property and charge ordering phase of La0.4Ca0.6MnO3 was studied through the measurements of X-ray diffraction （XRD）, magnetization-temperature （M-T） curves and electron spin resonance （ESR） spectra. The experimental results indicate that the mother’s body of La0.4Ca0.6MnO3 has very complicated magnetic structure, exhibits charge ordering phase at 258 K, and shows long-range strongly correlated charge ordering-antiferromagnetism （CO-AFM） phase from 175 to 50 K. Spin glass state appears when the temperature decreases to about 41 K. When the Cr substitution amount is x = 0.06, the charge ordering phase of the mother’s body is de-stroyed, because the Cr3+ substitution for Mn3+ destroys the spin order of CE-type antiferromagnetism, and thus leads to the melting of charge ordering. It is verified experimentally that the strong coupling between charge order and spin order exists in the charge order system of CE-type antiferromagnetism.
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