Coulomb blockade and magnetoresistance in granular La_1.32Sr_1.68Mn₂O₇ under hydrostatic pressure

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• 作者：A. Narjis^a ; ^{narjis78@gmail.com} ; A. El kaaouachi^a ; L. Limouny^a ; S. Dlimi^a ; M. Errai^a ; A. Sybous^a ; M. Kumaresavanji^b
• 关键词：La1.32Sr1.68Mn2O7 layered manganite ; Coulomb blockade ; Magnetoresistance
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：332
• 期：Complete
• 页码：6-9
• 全文大小：303 K

文摘

The transport properties in the La_1.32Sr_1.68Mn₂O₇ 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.