Giant coercivity and spin clusters in high pressure polymorphs of Mn 2 LiReO 6 .
Giant coercivity and spin clusters in high pressure polymorphs of Mn 2 LiReO 6 .
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Mn 2 LiReO 6 高压多晶型物中的巨大矫顽力和自旋团簇。
DOI：
10.1039/d2tc00451h
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发表时间：
2022
影响因子：
6.4
通讯作者：
Solana-Madruga E
中科院分区：
文献类型：
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作者：
Solana-Madruga E
我们提出了Mn 2LiReO 6在高压下合成的两种不同的多晶型。它们是唯一在B/B′位上具有理想+/7+电荷分布的A位锰氧化物。低压多晶型物以极性R3有序钛铁矿型结构（OIL）结晶，计算的极化率为26.9 μC cm−2。它显示了由于Li/Mn反位混合的团簇自旋玻璃行为。良好有序的高压双钙钛矿多晶型物（DPv，P21/n）开发弱铁磁性与巨磁矫顽力（HC = 6.9 T，2 K）由于磁晶各向异性增强的磁限制交换相互作用，但在没有自旋轨道耦合。
We present Mn2LiReO6 synthesised at high pressure in two different polymorphs. They are the only A-site manganites with an ideal +/7+ charge distribution over the B/B′ sites. The lower pressure polymorph crystallises in a polar R3 ordered-ilmenite type structure (OIL) with a calculated 26.9 μC cm−2 electrical polarisation. It shows a cluster spin glass behaviour due to Li/Mn anti-site mixing. The well-ordered higher-pressure double-perovskite polymorph (DPv, P21/n) develops weak-ferromagnetism with giant magnetic coercivity (HC = 6.9 T at 2 K) due to magnetocrystalline anisotropy enhanced by symmetry-restricted exchange interactions but in the absence of spin–orbit coupling.