Transition-metal-only perovskite oxides can introduce additional magnetic functionality with robust magnetoelectric properties but are rare. In this work we prepared a new transition-metal-only perovskite Mn₂(Fe_0.8Mo_0.2)MoO₆ at high pressure and temperature. Uniquely, Mn₂(Fe_0.8Mo_0.2)MoO₆ was discovered as a line phase upon composition modulation that was motivated from the above-room-temperature multiferroic Mn₂FeMoO₆ corundum phase. It exhibits ferrimagnetic Fe–Mo sublattice (T_C = 194 K) and Mn sublattice antiferromagnetic (T_m ∼ 45 K) transitions. Below T_m the two sublattice orderings are coupled and give rise to canted components in both. A first-order field-induced transition is also observed below 45 K. Mn₂(Fe_0.8Mo_0.2)MoO₆ is a Mott variable range hopping semiconductor. These findings for the first time show that either an exotic perovskite or a corundum phase can be achieved by composition modulation besides the pressure effect.

中文翻译：

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Mn ₂（Fe _0.8 Mo _0.2）MoO ₆：具有多个过渡金属亚晶格磁性效应的双钙钛矿

仅有过渡金属的钙钛矿氧化物可以引入具有强大磁电性能的其他磁性功能，但很少见。在这项工作中，我们在高压和高温下制备了一种仅过渡金属的钙钛矿型Mn ₂（Fe _0.8 Mo _0.2）MoO ₆。独特地，发现了Mn ₂（Fe _0.8 Mo _0.2）MoO ₆作为组分调制的线相，其是由高于室温的多铁性Mn ₂ FeMoO ₆刚玉相激发的。它表现出铁磁性的Fe-Mo亚晶格（T _C = 194 K）和Mn亚晶格反铁磁（T_米〜45 K）的过渡。在T _m以下，两个子晶格顺序耦合，并在两个子晶格中产生倾斜分量。在45 K以下还观察到一阶场感应跃迁。Mn ₂（Fe _0.8 Mo _0.2）MoO ₆是莫特可变范围跳跃半导体。这些发现首次表明，除了压力作用外，还可以通过成分调制获得奇异的钙钛矿或刚玉相。