CAJ | 학술논문

通过测量样品的磁化强度-温度曲线、电阻率-温度曲线及磁电阻-温度曲线,研究了Dy掺杂(0.00≤x≤0.30)对La0 7-xDyxSr0.3MnO3体系磁电性质的影响.实验发现,随Dy掺杂量的增加,体系磁结构从长程铁磁有序向自旋团簇玻璃态、反铁磁状态转变;x=0.20、0.30时的低温磁行为发生异常,电行为存在低温电阻率极小值现象.这些奇特现象不仅来源于掺杂引起的晶格效应,也来源于掺杂引起的额外磁性耦合.
통과측량양품적자화강도-온도곡선、전조솔-온도곡선급자전조-온도곡선,연구료Dy참잡(0.00≤x≤0.30)대La0 7-xDyxSr0.3MnO3체계자전성질적영향.실험발현,수Dy참잡량적증가,체계자결구종장정철자유서향자선단족파리태、반철자상태전변;x=0.20、0.30시적저온자행위발생이상,전행위존재저온전조솔겁소치현상.저사기특현상불부래원우참잡인기적정격효응,야래원우참잡인기적액외자성우합.
By measuring M-T curves, ρ-T curves and MR-T curves of the samples under different temperatures, the influence of Dy doping (0.00 ≤ x ≤0.30) on the magnetic and electric properties of La0.7-xDyxSr0.3MnO3 has been studied. The experimental results show that, with the increase of the Dy content, the system undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. For the samples with x=0.20 and 0.30, their magnetic behaviors are abnormal at low temperature, and their resistivities at low temperature have a minimum value. These peculiar phenomena not only come from the lattice effect induced by doping, but also from extra magnetic coupling induced by doping.