Enhancement of ferromagnetism and metallicity in Ru-doped layered manganite system La_(1.2)Ca_(1.8)Mn_(2-x)Ru_(x)O_(7) (x=0,0.1,0.5,1.0)

摘要

We report here the interesting magnetic and electrical transport properties of Ru-doped two-dimensional manganite system La_(1.2)Ca_(1.8)Mn_(2-x)Ru_(x)O_(7) (x=0,0.1,0.5,1.0). This work aims to investigate the nature of the magnetic phase especially at low temperatures and electrical transport in the light of metal insulator transition exhibited by similar systems. The Ru doping is found to affect the magnetic and electrical properties considerably. The ferromagnetic ordering temperature (T_(c)) increases from 264 K for x=0 to 285 K for x=0.5 sample.