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  Sci. Lett. J. 2013, 2: 31  
  Research Article
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Effect of nickel on the magnetic and magnetotransport properties of La0.7Bi0.3MnO3  
  V. K. Jhaa, Md. Motin Seikhb, R. Chatterjeec, Asish K. Kundua  
a Discipline of Physics, Indian Institute of Information Technology, Design & Manufacturing, Dumna Airport Road, Jabalpur–482005, India
b Department of Chemistry, Visva-Bharati University, Santiniketan, West Bengal –731235, India
c Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi-11016, India

  The substitution of manganese by nickel in the bismuth based perovskites La0.7Bi0.3Mn1-xNixO3 has allowed us the normal condition synthesis of magnetic insulators La0.7Bi0.3MnO3 and La0.7Bi0.3Mn0.7Ni0.3O3. Both phases are indeed ferromagnetic with Curie temperatures TC of 130 and 145 K, respectively. These materials are insulating in the ferromagnetic phase with activation energies of 75 and 80 meV, respectively. The B-site substituted phase is better insulator than the parent compound La0.7Bi0.3MnO3. In presence of an external magnetic field of 7 Tesla, they exhibit certain changes in the resistivity behaviours at low temperatures. For La0.7Bi0.3MnO3, the highest magnetoresistance (MR) value of -68% is obtained at 80 K (and -65% at 110 K). However, the MR value reduces in the Ni-substituted phase to about -42% at 110 K. The observed results can be explained on the basis of competing ferromagnetic and antiferromagnetic interactions as well as the electronic phase separation.  
  Perovskites; Ferromagnetism; Magnetoresistance; Electronic phase separation  
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