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中野 匡規*; Wang, Y.*; 吉田 訓*; 松岡 秀樹*; 真島 裕貴*; 池田 啓祐*; 平田 靖透*; 竹田 幸治; 和達 大樹*; 小濱 芳允*; et al.
Nano Letters, 19(12), p.8806 - 8810, 2019/12
被引用回数:56 パーセンタイル:92.05(Chemistry, Multidisciplinary)The discoveries of intrinsic ferromagnetism in atomically thin van der Waals crystals have opened a new research field enabling fundamental studies on magnetism at two-dimensional (2D) limit as well as development of magnetic van der Waals heterostructures. Here we demonstrate that VSe epitaxial thin films grown by molecular-beam epitaxy exhibit emergent 2D ferromagnetism with intrinsic spin polarization of the V 3d electrons although the bulk counterpart is originally antiferromagnetic. Moreover, thickness-dependence measurements reveal that this newly developed 2D ferromagnet could be classified as an itinerant 2D Heisenberg ferromagnet with weak magnetic anisotropy.
吉松 公平*; 石丸 純也*; 渡会 啓介*; 山本 航平*; 平田 靖透*; 和達 大樹*; 竹田 幸治; 堀場 弘司*; 組頭 広志*; 坂田 修身*; et al.
Physical Review B, 99(23), p.235129_1 - 235129_8, 2019/06
被引用回数:10 パーセンタイル:49.82(Materials Science, Multidisciplinary)We report on magnetic and electronic properties of the B-site-ordered double-perovskite LaCrMnO films grown by pulsed-laser deposition. The magnetic-field dependence of magnetization curves showed hysteresis at low temperatures regardless of the degree of Cr/Mn order and the saturation magnetization became smaller for the higher-Cr/Mn-ordered film. The X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements suggested antiferromagnetic coupling between Cr and Mn ions, resulting in ferrimagnetism of the B-site-ordered double-perovskite LaCrMnO. A band structure was established by combining these results together with the synchrotron-radiation photoemission and optical spectra. We discuss the magnetic states among the -site-ordered LaMnO ( transition-metal elements from V to Ni) being basically consistent with the Kanamori-Goodenough rule.
平田 靖透*; 小嶋 健児*; 内田 慎一*; 石角 元志; 伊豫 彰*; 永崎 洋*; 田島 節子*
Physica C, 470(Suppl.1), p.S44 - S46, 2010/12
被引用回数:2 パーセンタイル:12.12(Physics, Applied)多層系HgBaCaCuO ( = 2, 3, 4, and 5)多層系HgBaCaCuOの赤外反射率スペクトルを測定した。多層CuO面間のジョセフソン結合に付随した光学プラズマモードは、反射率スペクトルのc軸成分に以下で出現する。二層と三層化合物において、光学ジョセフソンプラズマモードはこれまでにないほど高い周波数、700-800cmに以下で出現する。プラズマ周波数は四層と五層化合物においてかなり減少する。これは、内側CuO面内の超伝導秩序の抑圧を示しており、NMR実験の結果と一致している。