We report for the first time the magnetic structure of the high entropy oxide (Mg_0.2Co_0.2Ni_0.2Cu_0.2Zn_0.2)O using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by direct current and alternating current magnetic susceptibility, neutron diffraction, and spectroscopy. The magnetic propagation wavevector is k = (1/2, 1/2, 1/2) based on the cubic structure Fm3̅m, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Neutron spectroscopy reveals strong magnetic excitations at 100 K that survive up to room temperature. This work demonstrates that entropy-stabilized oxides represent a unique platform to study long-range magnetic order with an extreme chemical disorder.

中文翻译：

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岩盐高熵氧化物中的远距离反铁磁有序

我们首次使用中子粉末衍射报告了高熵氧化物（Mg _0.2 Co _0.2 Ni _0.2 Cu _0.2 Zn _0.2）O的磁性结构。这种材料表现出缓慢的磁跃迁，但具有长程有序的反铁磁基态，如直流和交流磁化率，中子衍射和光谱学所揭示的那样。磁性传播波矢是ķ基于所述立方结构=（1/2，1/2，1/2）FM 3米，其磁性结构由（111）平面中的铁磁片组成，两个相邻平面之间的自旋反平行。中子光谱学揭示了在100 K的强磁激发能存活到室温。这项工作表明，熵稳定的氧化物代表了研究具有极端化学无序性的长距离磁有序的独特平台。