| Collapse of charge ordering in Bi0.5Sr0.5MnO3 by cation disorder： a magnetic and structural investigation |
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| 作者单位： | S. Savitha Pillai（Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai -600036） ;Rajasekhar Madugundo（Defence Metallurgical Research Laboratory, Hyderabad -500 058, India） ;Santhosh. P. Nagappan Nair（Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai -600036） ; |
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| 基金项目： | Project supported by the Ministry of Hunan Resources and Development (India) |
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| 摘 要： | The structure, transport, and magnetic properties of LaxBi0.5.xSr0.5MnO3 （LBSMO） （x=0.1 and 0.4） were studied through X-ray diffraction, magnetization, and electron spin resonance （ESR） measurements. The structural analysis showed that the LBSMO crystallized in an orthorhombic perovskite structure with Pbnm space group for x=-0.1 and Imma space group for x=0.4 and the highly polarizable 6s^2 lone pair of Bi^3＋ was the ttming factor for the structural variations. Magnetic studies revealed that the replacement of Bi ions by La ions resulted in the collapse high temperature charge ordering state of BSMO and it order Ferro Magnetically （FM） with Tc around 355 and 330 K for x=0.1 and 0.4, respectively. Both ESR, temperature and field dependant magnetization suggested that there was a coexistence of FM and the paramagnetic phases well below Tc and the FM and CO-AFM phases below 250 K of LBSMO.
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| 关 键 词： | 永磁发电机 稀土 Bi0.5Sr0.5MnO3 阳离子 |
| 收稿时间： | 2007-08-16 |
Collapse of charge ordering in Bi0.5Sr0.5MnO3 by cation disorder: a magnetic and structural investigation |
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| S. Savitha Pillai, Rajasekhar Madugundo,Santhosh. P. Nagappan Nair,. Collapse of charge ordering in Bi0.5Sr0.5MnO3 by cation disorder: a magnetic and structural investigation[J]. Journal of Rare Earths, 2008, 26(2): 237-240. DOI: 10.1016/S1002-0721(08)60072-1 |
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| Authors: | S. Savitha Pillai Rajasekhar Madugundo Santhosh. P. Nagappan Nair |
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| Affiliation: | [1]Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai -600036 [2]Defence Metallurgical Research Laboratory, Hyderabad -500 058, India |
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| Abstract: | The structure, transport, and magnetic properties of LaxBi0.5-xSr0.5MnO3 (LBSMO) (x=0.1 and 0.4) were studied through X-ray diffraction, magnetization, and electron spin resonance (ESR) measurements. The structural analysis showed that the LBSMO crystallized in an orthorhombic perovskite structure with Pbnm space group for x=0.1 and Imma space group for x=0.4 and the highly polarizable 6s2 lone pair of Bi3 was the tuning factor for the structural variations. Magnetic studies revealed that the replacement of Bi ions by La ions resulted in the collapse high temperature charge ordering state of BSMO and it order Ferro Magnetically (FM) with TC around 355 and 330 K for x=0.1 and 0.4, respectively. Both ESR, temperature and field dependant magnetization suggested that there was a coexistence of FM and the paramagnetic phases well below TC and the FM and CO-AFM phases below 250 K of LBSMO. |
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| Keywords: | charge ordering (CO) colossal magneto resistance (CMR) rare earths |
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