首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Role of surface phenomena in the magnetoresistivity of polycrystalline manganites La1−x CaxMnO3
Authors:N I Solin  A A Samokhvalov  S V Naumov
Institution:(1) Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, 620219 Ekaterinburg, Russia
Abstract:The dc electrical resistivity and magnetoresistivity of polycrystalline manganites La1−x CaxMnO3 (x=0–0.3) are investigated as functions of the temperature, magnetic field and electric field, along with the microwave surface resistance. The investigations show that the dc electrical resistivity and magnetoresistivity are governed by the surface properties of the intergranular boundaries. The dc electrical resistivity is observed to decrease substantially (tenfold) for a comparatively small electric field (E⋟100 V/cm). Estimates are obtained for the internal electrical resistivity of the granules, the thickness of the contact layer (which depends on the temperature and the magnetic field), and the height of the potential barrier between the interfaces separating the surface layer and inner layer of a granule. Fiz. Tverd. Tela (St. Petersburg) 40, 1881–1884 (October 1998)
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号