Rock salt-type HoO epitaxial thin film as a heavy rare-earth monoxide ferromagnetic semiconductor with a Curie temperature above 130 K
Rock salt-type HoO epitaxial thin film as a heavy rare-earth monoxide ferromagnetic semiconductor with a Curie temperature above 130 K
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DOI：
10.1063/5.0081040
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发表时间：
2022-02-21
影响因子：
4
通讯作者：
Fukumura, Tomoteru
中科院分区：
文献类型：
--
作者：
Amrillah, Tahta;Oka, Daichi;Fukumura, Tomoteru
HoPn（HoPn：Pn = N，P，As，Sb，and Bi）和单硫族化合物（HoCh：Ch = S，Se，and Te）具有非平凡的磁性结构，而固相HoO还没有被合成。在这项研究中，岩盐型HoO外延薄膜生长通过使用脉冲激光沉积方法，它具有0.11 eV的带隙和可调的导电通过其氧的非化学计量比。它的居里温度，高于130 K，是远远高于那些HoPn和HoCh，最有可能是由于增强的直接交换相互作用。类似于HoPn和HoCh，HoO薄膜在居里温度以下表现出变磁行为，尽管其占主导地位的铁磁有序。
Ho monopnictides (HoPn: Pn = N, P, As, Sb, and Bi) and monochalcogenides (HoCh: Ch = S, Se, and Te) are known to possess a nontrivial magnetic structure, while solid-phase HoO has not been synthesized yet. In this study, a rock salt-type HoO epitaxial thin film was grown by using the pulsed laser deposition method, which had a bandgap of 0.11 eV and tunable electrical conduction via its oxygen nonstoichiometry. Its Curie temperature, above 130 K, was much higher than those of HoPn and HoCh, most likely due to an enhanced direct exchange interaction. Similar to HoPn and HoCh, a HoO thin film showed a metamagnetic behavior below the Curie temperature in spite of its dominant ferromagentic ordering.