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Citation: Li Ya-Dong, Zhang Jian-Hui, Zhu Chang-Fei, Liu Wei, Xiong Cao-Shui, Zhou Yi, Qian Yi-Tai. Preparation and Pecuiar Magnetoresistance of La_0.67Sr_0.33Fe_xMn_1-xO₃[J]. Acta Physico-Chimica Sinica, ;1997, 13(12): 1079-1083. doi: 10.3866/PKU.WHXB19971205 shu

Preparation and Pecuiar Magnetoresistance of La_0.67Sr_0.33Fe_xMn_1-xO₃

1.
Structure Reaserch Laboratory,Academia Sinica,Hefei 230026

Received Date: 3 February 1997
Available Online: 15 December 1997

The Ln0.67Sr0.33Fe.Mn1-xO3(LSFMO)(0.05< x <0.33) systems have been synthesized by co-precipitation. The X-ray diffraction patterns indicates that these compounds are of single phase with rhombohedral structure. The resistivity of samples was measured in zero field and applied field (H=4000Oe) by a standard four-probe method. Large magnetoresistance (MR) was found in all samples. There is a resistivity transition peak in LSFMO (x ≦0.13) in which MR negative, the temperature (TP) at which the resistivity peak occurs decreases with the increasing of x. LSFMO (x=0.23) to which the large negative MR is still found is a semiconductor, It is unexpected that a peculiar alternative positive negative MR was found in LSFMO(x=0.33) which also is a semicondutor.
- Co-precipitation,
- Route,
- Rhombohedral structure
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Preparation and Pecuiar Magnetoresistance of La0.67Sr0.33FexMn1-xO3

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通讯作者: 陈斌, bchen63@163.com

Preparation and Pecuiar Magnetoresistance of La_0.67Sr_0.33Fe_xMn_1-xO₃