Antiferromagnetic metal phase in an electron-doped rare-earth nickelate
Antiferromagnetic metal phase in an electron-doped rare-earth nickelate
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DOI：
10.1038/s41567-022-01907-2
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发表时间：
2023-01-30
期刊：
影响因子：
19.6
通讯作者：
Mundy，Julia A.
中科院分区：
文献类型：
--
作者：
Song，Qi;Doyle，Spencer;Mundy，Julia A.
反铁磁材料长期以来一直被视为被动元件，由于其对外场的不敏感性和高速开关的潜力，反铁磁材料已成为自旋电子器件的有希望的候选者。利用自旋和轨道效应的最新工作已经确定了电控制和探测金属反铁磁体中的自旋的方法，特别是在非共线或非中心对称的自旋结构中。稀土镍酸盐NdNiO3是一种非共线的反铁磁材料，其反铁磁有序化的发生伴随着向绝缘态的转变。在这里，我们发现，对于低电子掺杂，镍网站上的磁性秩序被保存，而电子，一个新的金属相诱导。我们发现，这种金属相的费米表面，主要是由键的重结晶驱动的电子重建间隙。此外，我们证明了通过一个大的零场平面霍尔效应写入和读取自旋结构的能力。我们的研究结果扩展了稀土镍酸盐已经丰富的相图，并可能使自旋电子学应用在这个家庭的相关氧化物。
Long viewed as passive elements, antiferromagnetic materials have emerged as promising candidates for spintronic devices due to their insensitivity to external fields and potential for high-speed switching. Recent work exploiting spin and orbital effects has identified ways to electrically control and probe the spins in metallic antiferromagnets, especially in non-collinear or non-centrosymmetric spin structures. The rare-earth nickelate NdNiO3is known to be a non-collinear antiferromagnet in which the onset of antiferromagnetic ordering is concomitant with a transition to an insulating state. Here we find that for low electron doping, the magnetic order on the nickel site is preserved, whereas electronically, a new metallic phase is induced. We show that this metallic phase has a Fermi surface that is mostly gapped by an electronic reconstruction driven by bond disproportionation. Furthermore, we demonstrate the ability to write to and read from the spin structure via a large zero-field planar Hall effect. Our results expand the already rich phase diagram of rare-earth nickelates and may enable spintronics applications in this family of correlated oxides.