La(0.3)Ca(0.7)Mn(1–x)VxO3体系的电荷序和自旋序(英文)

CHARGE ORDER AND SPIN ORDER Of La_(0.3)Ca_(0.7)Mn_(1-x)V_xO_3 SYSTEM

通过对样品La0.3Ca0.7Mn1–xVxO3(x=0.05,0.10,0.134,0.20)的磁化强度–温度(magnetization–temperature,M–T)曲线、电阻率–温度(resistivity–temperature,ρ–T)曲线、电子自旋共振谱的测量,研究了Mn位V掺杂对La0.3Ca0.7MnO3体系电荷序和自旋序的影响。结果表明:当0.05≤x≤0.134时,体系存在电荷有序(CO)相,体系自旋序随温度降低发生顺磁(paramagnetism,PM)–电荷有序(charge ordering,CO)–反铁磁(antiferromagnetism,AFM)变化。当x=0.20时,电荷有序融化,体系出现再入型自旋玻璃行为。

Influence of V doping at Mn-site on charge order and spin order of the La0.3Ca0.7MnO3 system was studied by measurements of the magnetization-temperature （M-T） and resistivity-temperature （p-T） curves of La0.3Ca0.7Mn1-xVxO3 samples （x=0.05, 0.10, 0.134, and 0.20） and the electron spin resonance spectra. The results show that when 0.05≤x≤0.134, charge ordering （CO） phase exists in the system, and the spin order of the system exhibits the change of paramagnetism （PM）-charge ordering （CO）-antiferromagnetism （AFM） with decrease of temperature. When x=0.20, the charge ordering dissipates, and the system exhibits second-entering-type spin glass behavior.