Coulomb blockade and magnetoresistance in granular La1.32Sr1.68Mn2O7 under hydrostatic pressure

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:332

Article

Narjis, A.¹  El Kaaouachi, A.¹  Limouny, L.¹  Dlimi, S.¹  Errai, M.¹  Sybous, A.¹  Kumaresavanji, M.² 

[1] Univ Ibn Zohr, Res Grp ESNPS, Dept Phys, Hay Dakhla 80000, Agadir, Morocco

[2] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

关键词: La1.32Sr1.68Mn2O7 layered manganite;    Coulomb blockade;    Magnetoresistance;   

DOI  :  10.1016/j.jmmm.2012.12.002

来源: Elsevier

【 摘 要 】

The transport properties in the La1.32Sr1.68Mn2O7 layered manganite system have been studied in the presence of magnetic field up to 5 T. An analysis of the low temperature (T<45 K) dependence of the resistivity under hydrostatic pressure up to 25 kbars shows the spin-dependent Coulomb Blockade phenomenon. The surface phase and the link condition in grain boundaries are suggested to be responsible for the magnetoresistance data while influencing the charge transfer probability between grains. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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