Physics – Condensed Matter – Materials Science
Scientific paper
2005-05-17
Physics
Condensed Matter
Materials Science
14 pages, 7 figures
Scientific paper
10.1088/0022-3727/39/17/003
Polycrystalline thin films of double layer manganite La_1.4Ca_1.6Mn_2O_7 (DLCMO) have been deposited by nebulized spray pyrolysis on single crystal LaAlO_3 substrates. These single phase films having grain size in the range 70-100 nm exhibit ferromagnetic transition at T_C ~ 107K. The short range ferromagnetic ordering due to in plane spin coherence is evidenced to occur at a higher temperature around 225 K. Insulator/semiconductor to metal transition occurs at a lower temperature T_P ~ 55K. The transport mechanism above T_C is of Mott`s variable range hopping type. Below T_C the current-voltage characteristics show non-linear behaviour that becomes stronger with decreasing temperature. At low temperatures below T_CA ~ 30K a magnetically frustrated spin canted state is observed. The DLCMO films exhibit resonable low field magnetoresistance and at 77K the magnetoresistance ratio is ~ 5% at 0.6 kOe and \~ 13% at 3 kOe.
Singh Hemant Kumar
Siwach P. K.
Srivastava O. N.
No associations
LandOfFree
Magneto-transport characteristics of La1.4Ca1.6Mn2O7 thin film deposited by spray pyrolysis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magneto-transport characteristics of La1.4Ca1.6Mn2O7 thin film deposited by spray pyrolysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-transport characteristics of La1.4Ca1.6Mn2O7 thin film deposited by spray pyrolysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-599463