Transition Insulator-Metal and Antiferromagnetic-Paramagnetic Cu Doped in La_(0.47)Ca_(0.53)MnO_3

摘要

The study of the perovskite manganites La_(0.47)Ca_(0.53)Mn_(1-x)Cu_xO_3 with x = 0, 0.06, 0.10, and 0.13 has been done. The magnetic structure was determined using high-resolution neutron scattering at room temperature and low temperature. All samples were paramagnetic at room temperature and antiferromagnetic at low temperature. Using the squid quantum design, the samples showed that the doping of the insulating antiferromagnetic phase La_(0.47)Ca_(0.53)MnO_3 with Cu doping resulted in the temperature transition from an insulator to metal state, and an antiferromagnetic to paramagnetic phase. The temperature transition from an insulator to metal state ranged from 23 to 100 K and from 200 to 230 K for the transition from an antiferromagnetic to paramagnetic phase.