【摘要】 实验研究了La_2/3Ca_1/3MnO₃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。更多还原

【Abstract】 The effect of YSZ doping level on transport properties and magnetoresistance in La2/3Ca1/3MnO3 has been experimentally studied. The samples are prepared by a standard sol-gel method. Through the measurement of the electronic properties of samples we can draw a conclusion that for x < 2%, the dopant cause the metal-insulator transition shift to low temperature and increase the resistance of samples. Then with the increase of doping level further, the resistance decreases and the metal-insulator transition temperature increase. Meanwhile , the YSZ dopant can increase the LFMR, it’s maximum at 1%.更多还原