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The Role of Spin-Polarized Tunneling on Transport Properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 Nanocomposites (x = 0 ÷ 5wt%)

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Physics and Engineering of New Materials

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 127))

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Abstract

We have investigated the effect of artificial grain boundaries on the electromagnetic properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 nanocomposites (x x= 0 x÷ 5wt%). Based upon a spin-polarized tunneling mechanism we have proposed a phenomenological model to explain the observed electrical transport behavior over the whole temperature range (70 ÷ 300K), especially the gradual drop of metal-insulator transition temperature (Tp) as a function of increasing Al2O3 content, while the feromagnetic-paramagnetic transition temperature (TC) remains almost constant (TC x= 250K). A large low-field magneto-resistance was observed for all the composite samples and the largest magnetoresistance ratio was recorded for a composition with x x=0.01.

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Author information

Authors and Affiliations

  1. Ninhhoa Department of Education, Khanhhoa, Vietnam

    Pham Thanh Phong

  2. Institute of Material Science, Vietnamese Academy of Science and Technology Hanoi, Vietnam

    Pham Thanh Phong, Nguyen Xuan Phuc & Le Van Hong

  3. Hongduc University, Thanhhoa, Vietnam

    Nguyen Van Khiem

Authors
  1. Pham Thanh Phong
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  2. Nguyen Van Khiem
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  3. Nguyen Xuan Phuc
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  4. Le Van Hong
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Editor information

Editors and Affiliations

  1. Institute of Engineering Physics, Hanoi University of Technology, Dai Co Viet Road 01, Hanoi, Hai Ba Trung District, Vietnam

    Do Tran Cat

  2. Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, Heidelberg, 69120, Germany

    Annemarie Pucci (Fakultät Physik und Astronomie) (Fakultät Physik und Astronomie)

  3. Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, Bonn, 53115, Germany

    Klaus Wandelt

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© 2009 Springer-Verlag Berlin Heidelberg

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Phong, P.T., Khiem, N.V., Phuc, N.X., Hong, L.V. (2009). The Role of Spin-Polarized Tunneling on Transport Properties of (1–x)La0.7Ca0.3MnO3 + xAl2O3 Nanocomposites (x = 0 ÷ 5wt%). In: Cat, D.T., Pucci, A., Wandelt, K. (eds) Physics and Engineering of New Materials. Springer Proceedings in Physics, vol 127. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-88201-5_15

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