Magneto-transport properties of La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3 tunnel junction

Pramana

R Pinto²  C Mitra³  P Raychaudhuri1¹  K H Muller³  G Kobernik³  K Dorr³ 

[1] Department of Physics and Astronomy, University of Birmingham, B15 2TT, UK$$;Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$;Institut fur Festkorper und Wekstofforschung, Dresden, D-01069 Dresden, Germany$$

关键词: La0.7Ce0.3MnO3/SrTiO3/La0.7Ce0.3MnO3 tunnel junction;    magneto-transport properties;    magnetoresistance.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Hole-doped rare-earth manganite La0.7Ca0.3MnO3 and the electron-doped manganite La0.7Ce0.3MnO3 both show a metal–insulator transition around 250 K associated with a ferromagnetic transition and colossal magnetoresistance. In an earlier publication we have reported the rectifying characteristic of La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3 tunnel junction at room temperature, showing that it is possible to fabricate a diode out of the polaronic insulator regime of doped manganites. Here we report the magneto-transport properties of such a tunnel junction above and below the metal–insulator transition. We show, from the large positive magnetoresistance of the tunnel junction at low temperature, that La0.7Ce0.3MnO3 could be a minority spin carrier ferromagnet. The implication of this observation is discussed.

【 授权许可】

Unknown