【摘要】 介绍了LnMnO3(Ln=La3+,Pr3+,Nd3+等稀土离子)体系的结构、磁电特性及Ln位掺杂对其物性的影响。未掺杂的稀土锰氧化物多为反铁磁性绝缘体,而Ln位掺杂后的锰氧化物则由于双交换作用和Jahn-Teller畸变效应等,在一定掺杂范围内低温下显示铁磁性和金属导电性,在高温区则表现出非晶固体和掺杂半导体导电性,或因电子与晶格相互作用而呈现绝缘体特征。更多还原

【Abstract】 In this paper, the crystal structure, transport properties and effects of elemental substitutions were systematically studied for the strong correlation manganite LnMnO₃（Ln=La 3+,Pr 3+,Nd 3+ ,etc.） systems. Undoped LnMnO₃, as a typical perovskite compound, is an antiferromagnetic Mott insulator. When a part of trivalent Ln ions is substituted by divalent alkatine-earth ions, the compound ground state becomes metallic ferromagnetic, and a metal-insulator transition near the Curie temperature. It is ordinarily explained by the double-exchange model and Lahn-Teller distortions.更多还原