| Ag掺杂类钙钛矿Ca(Mn_2Cu_1)Mn_4O_(12)的电磁性能 |
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| 引用本文： | 吴坚. Ag掺杂类钙钛矿Ca(Mn_2Cu_1)Mn_4O_(12)的电磁性能[J]. 江西科学, 2005, 0(4) |
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| 作者姓名： | 吴坚 |
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| 作者单位： | 河海大学理学院 江苏南京210098 |
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| 摘 要： | 采用固相反应法制备了系列Ca(Mn2Cu1)Mn4O12/mAg2O多晶类钙钛矿锰氧化物。X射线衍射表明,m≤0.3的样品呈比较纯净的类钙钛矿相,而m>0.3的样品,是由类钙钛矿和金属Ag相组成的复合物。所有样品呈现半导体导电性质,电阻率低于未掺杂的Ca(Mn2Cu1)Mn4O12样品。居里温度测量表明,随着Ag掺杂量的增加,样品的居里温度逐渐升高。对于m=0.3和m=0.6的样品,120K温度和1T磁场下磁电阻比可达-10%左右。
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| 关 键 词： | 磁电阻效应 钙钛矿结构 自旋相关散射 |
Magnetic and Electronic Transport Properties in Ag Doped Ca(Mn_2Cu_1)Mn_4O_(12) Polycrystalline Perovskite Manganites |
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| WU Jian. Magnetic and Electronic Transport Properties in Ag Doped Ca(Mn_2Cu_1)Mn_4O_(12) Polycrystalline Perovskite Manganites[J]. Jiangxi Science, 2005, 0(4) |
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| Authors: | WU Jian |
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| Abstract: | Microstructure,magnetic and transport properties of the inhomogeneous system (Ca(Mn_2Cu_1)Mn_4O_(12) )/mAg_2O(1/m is molar ratio) have been studied.X-ray diffraction pattems show that the structure is a single perovskite phase for m<0.3 samples and there are two-phase composite (perovskite phase and a nonmagnetic metal Ag phase) for m>0.3 samples.The room temperature magnetoresistance (MR) effect is enhanced significantly due to the addition of Ag.For the m=0.3 and 0.6 samples the MR ratios reach-10% under a lower field of 1 T at the temperature of 120 K.The effect is discussed qualitatively by use of spin-dependent scattering effects at grain boundaries. |
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| Keywords: | Magnetoresistance Perovskite Spin-dependent scattering |
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