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中文摘要：
研究了钙钛矿型半掺杂锰氧化物Pr0．5Ca0．5Mn1-xCrxO3（x=0、0．03、0．05、0．07、0．10）体系的输运性质、电荷有序和磁电阻效应。结果表明，Cr离子替代Mn位，增强了Pr0.5Ca0.5MnO3的铁磁性、金属电导和磁电阻值。在低掺杂情况下（x=0．03、0．05），Cr^3＋的掺杂使体系的铁磁性增强，当x〉0．05时（x=0．07、0．10），体系的铁磁性随x增大缓慢减弱。同时，随着掺杂量的增大，体系中的电荷有序相逐渐被抑制，磁电阻值也呈下降趋势，表明电荷有序相与磁电阻效应相关。Cr掺杂引起的各种磁耦合作用，包括Mn^3＋件与Cr^3＋的铁磁双交换作用，Cr^3＋-Cr^3＋、Mn^4＋-Mn^4＋、Cr^3＋-Mn^4＋之间的反铁磁超交换耦合作用及相分离现象是产生上述结果的主要原因。
英文摘要：
Systematic study of transport properties, charge ordering and the magnetoresistivity have been performed on the Cr-doped Pr0.5Ca0.5Mn1-xCrxO3（x=0, 0.03, 0.05, 0.07, 0.10） system. The results show that the doping of Cr ion on Mn site induces ferromagnetism, metallic conductivity and the magnetoresistance of the system. For the lower doping content （x=0. 03,0.05）, introduction of Cr^3＋ enhances ferromagnetism of the sample; while for x〉0.05（x=0.07,0.10）, the ferromagnetism decreases slowly with increase of Cr content. Meanwhile, as the Cr content increases, the charge-ordering phase is melted gradually and the magnetoresistance decreases, indicating that the charge ordering is correlated with the MR effect. These can be attributed to magnetic coupling interactions induced by doping Cr ions, including the ferromagnetic double exchange between Mn^3＋-Cr^3＋ , the superexchange of Cr^3＋ -Cr^3＋ , Mn^4＋-Mn^4＋ , Cr^3＋-Mn^4＋ and phase-separation phenomena.
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