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实验研究了La_(2/3)Ca_(1/3)MnO_3系统晶界上掺杂(YSZ)对其输运性能和磁电阻效应(MR)的影响。样品是由溶胶-凝胶法制成的。通过对样品的电输运特性的测量表明,在掺杂量(x)低于2％时,掺杂引起电阻的增大并降低了金属-绝缘体转变温度;当掺杂量高于2％时电阻逐渐减小,且转变温度增加。而低场磁电阻效应随掺杂量增加,在x=1％时达到最大。
The effects of doping (YSZ) on the grain boundary La (2/3) Ca_ (1/3) MnO_3 system on the transport properties and magnetoresistance (MR) were studied experimentally. Samples were made by sol-gel method. Measurement of the electrical transport properties of the samples shows that the doping increases the resistance and decreases the metal-insulator transition temperature when the doping amount (x) is less than 2%. When the doping amount is more than 2% The resistance decreases and the transition temperature increases. The low-field magnetoresistance effect increases with the doping amount, reaching the maximum at x = 1%.