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  Physics Express 2014, 4: 3
  Research Article
 
Structural, magnetic and transport properties of Gd0.7Ca0.3MnO3 and Gd0.7Ca0.3CrO3: A comparative study
  Sudipta Pala, Esa Boseb  
     
a Department of Physics, University of Kalyani, Kalyani, Nadia, W.B. 741235, India
b Department of Engineering Physics, B. P. Poddar Institute of Management & Technology, Kolkata -700052, India

   
  Abstract  
  The gadolinium-based perovskites Gd0.7Ca0.3MnO3 (GCMO) and Gd0.7Ca0.3CrO3 (GCCO) have been investigated and compared through their structural, magnetic and transport properties. It was found that both the compounds have completely different magnetic ground states but have similar crystallographic structures and exhibit negative magnetization at low temperatures in the field cooled (FC) process. Isothermal (2 K) magnetization values under applied magnetic field of 55 kOe recorded for GCMO and GCCO are 2.54 μB and 3.57μB, respectively. These low values indicate the antiparallel alignment of Mn / Cr and Gd sublattices. The conductivity data follows small polaron hopping (SPH) model for GCMO throughout the measured temperature range (5 - 400 K), while it shows a transition from SPH to variable range hopping (VRH) mechanism at low temperatures in case of GCCO.
     
  Keywords  
  Crystallographic structure; Negative magnetization ; Polaron hopping  
     
   
   
   
   
     

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