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論文

Electronic structure of a (3$$times$$3)-ordered silicon layer on Al(111)

佐藤 祐輔*; 深谷 有喜; Cameau, M.*; Kundu, A. K.*; 志賀 大亮*; 湯川 龍*; 堀場 弘司*; Chen, C.-H.*; Huang, A.*; Jeng, H.-T.*; et al.

Physical Review Materials (Internet), 4(6), p.064005_1 - 064005_6, 2020/06

 被引用回数:3 パーセンタイル:51.8(Materials Science, Multidisciplinary)

本研究では、放射光角度分解光電子分光を用いて、Al(111)表面上の3$$times$$3周期を持つSi層の電子バンド構造を解明した。実験では、線形のエネルギー分散に起因する閉じたフェルミ面を観測した。ハニカム状のシリセンをモデル構造とした第一原理計算の結果、これは基板との混成状態を起源としたディラックコーン様の金属バンドと考えられる。Al(111)表面上のSi層は、基板との相互作用によりディラック電子を発現し、いわゆるXeneと呼ばれる2次元物質群のモデルシステムになりうることを示唆する。

論文

Magnetic and electronic properties of B-site-ordered double-perovskite oxide La$$_{2}$$CrMnO$$_{6}$$ thin films

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:5 パーセンタイル:51.19(Materials Science, Multidisciplinary)

We report on magnetic and electronic properties of the B-site-ordered double-perovskite La$$_{2}$$CrMnO$$_{6}$$ 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$$^{3+}$$ and Mn$$^{3+}$$ ions, resulting in ferrimagnetism of the B-site-ordered double-perovskite La$$_{2}$$CrMnO$$_{6}$$. 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 $$B$$-site-ordered La$$_{2}$$$$B'$$MnO$$_{6}$$ ($$B':3d$$ transition-metal elements from V to Ni) being basically consistent with the Kanamori-Goodenough rule.

論文

Investigation of the electronic structure and lattice dynamics of the thermoelectric material Na-doped SnSe

Wu, P.*; Zhang, B.*; Peng, K. L.*; 萩原 雅之*; 石川 喜久*; 古府 麻衣子; Lee, S. H.*; 組頭 広志*; Hu, C. S.*; Qi, Z. M.*; et al.

Physical Review B, 98(9), p.094305_1 - 094305_7, 2018/09

 被引用回数:5 パーセンタイル:39.54(Materials Science, Multidisciplinary)

熱電材料であるNaドープしたSnSeについて、ARPES, 中性子回折, 中性子非弾性散乱でその電子構造と格子ダイナミクスを測定した結果を報告する。

論文

Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO$$_{3}$$ thin films

石上 啓介*; 吉松 公平*; 豊田 大介*; 滝沢 優*; 吉田 鉄平*; 芝田 悟朗*; 原野 貴幸*; 高橋 文雄*; 門野 利治*; Verma, V. K.*; et al.

Physical Review B, 92(6), p.064402_1 - 064402_5, 2015/08

 被引用回数:29 パーセンタイル:80.07(Materials Science, Multidisciplinary)

Thin films of the ferromagnetic metal SrRuO$$_{2}$$ (SRO) show a varying easy magnetization axis depending on the epitaxial strain, and undergo a metal-to-insulator transition with decreasing film thickness. We have investigated the magnetic properties of SRO thin films with varying thicknesses fabricated on SrTiO$$_{3}$$(001) substrates by soft X-ray magnetic circular dichroism at the Ru M2,3 edge. Results have shown that, with decreasing film thickness, the film changes from ferromagnetic to nonmagnetic at around 3 monolayer thickness, consistent with previous magnetization and magneto-optical Kerr effect measurements. The orbital magnetic moment perpendicular to the film was found to be 0.1$$mu$$B/Ru, and remained nearly unchanged with decreasing film thickness while the spin magnetic moment decreases. A mechanism for the formation of the orbital magnetic moment is discussed based on the electronic structure of the compressively strained SRO film.

論文

Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_3$$ thin films studied by X-ray magnetic circular dichroism

芝田 悟朗*; 吉松 公平*; 坂井 延寿*; Singh, V. R.*; Verma, V.*; 石上 啓介*; 原野 貴幸*; 門野 利治*; 竹田 幸治; 岡根 哲夫; et al.

Physical Review B, 89(23), p.235123_1 - 235123_5, 2014/06

AA2015-0419.pdf:0.33MB

 被引用回数:12 パーセンタイル:53.39(Materials Science, Multidisciplinary)

Metallic transition-metal oxides undergo a metal-to-insulator transition (MIT) as the film thickness decreases across a critical thickness of several monolayers (MLs), but its driving mechanism remains controversial. We have studied the thickness-dependent MIT of the ferromagnetic metal La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_3$$ by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The results suggest that the ferromagnetic phase gradually and most likely inhomogeneously turns into the paramagnetic phase and both phases abruptly become insulating at the critical thickness.

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