論文

• Yasuhide Mochizuki, Yu Kumagai, Hirofumi Akamatsu, Fumiyasu Oba. Polar metallic behavior of strained antiperovskites ACNi3 (A = Mg, Zn, and Cd) from first principles, Physical Review Materials, American Physical Society, Vol. 2, Issue 12, Dec. 2018.
• Yasuhide Mochizuki, Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba. Strain-engineered Peierls instability in layered perovskite La3Ni2O7 from first principles, Physical Review Materials, American Physical Society, Vol. 2, No. 12, pp. 125001, Dec. 2018.
• K. Fujita, T. Kawamoto, I. Yamada, O. Hernandez, H. Akamatsu, Y. Kumagai, F. Oba, P. Manuel, R. Fujikawa, S. Yoshida, M. Fukuda, K. Tanaka. Perovskite-type InCoO3 with low-spin Co3+: Effect of In-O covalency on structural stabilization in comparison with rare-earth series, Inorganic Chemistry, vol. 56, pp. 11113-11122, Sept. 2017.  公式リンク  
  
• Yu Kumagai, Kou Harada, Hirofumi Akamatsu, Kosuke Matsuzaki, Fumiyasu Oba. Carrier-induced band-gap variation and point defects in Zn3N2 from first principles, Physical Review Applied, vol. 8, pp. 014015-1-12, July 2017.  公式リンク  
  
• Megan E. Strayer, Arnab Sen Gupta, Hirofumi Akamatsu, Shiming Lei, Nicole A. Benedek, Venkatraman Gopalan, Thomas E. Mallouk. Emergent Noncentrosymmetry and Piezoelectricity Driven by Oxygen Octahedral Rotations in n = 2 Dion–Jacobson Phase Layer Perovskites, Advanced Functional Materials, Feb. 2016.  公式リンク  
  
• Sun Woo Kim, Zheng Deng, Man-Rong Li, Arnab Sen Gupta, Hirofumi Akamatsu, Venkatraman Gopalan, Martha Greenblatt. PbMn(IV)TeO6: A New Noncentrosymmetric Layered Honeycomb Magnetic Oxide, Inorganic chemistry, American Chemical Society, 55, 3, pp. 1333–1338, Jan. 2016.
• Arnab Sen Gupta, Hirofumi Akamatsu, Megan E. Strayer, Shiming Lei, Toshihiro Kuge, Koji Fujita, Clarina dela Cruz, Atsushi Togo, I. Tanaka, Katsuhisa Tanaka, Thomas E. Mallouk, Venkatraman Gopalan. Improper Inversion Symmetry Breaking and Piezoelectricity through Oxygen Octahedral Rotations in Layered Perovskite Family, LiRTiO4 (R = Rare Earths), Advanced Electronic Materials, Vol. 2, No. 1, p. 1500196, Dec. 2015.  公式リンク  
  
• Takeshi Yajima, Fumitaka Takeiri, Kohei Aidzu, Hirofumi Akamatsu, Koji Fujita, Wataru Yoshimune, Masatoshi Ohkura, Shiming Lei, Venkatraman Gopalan, Katsuhisa Tanaka, Craig M. Brown, Mark A. Green, Takafumi Yamamoto, Yoji Kobayashi, Hiroshi Kageyama. A labile hydride strategy for the synthesis of heavily nitridized BaTiO3, Nature Chemistry, Nature Publishing Group, Vol. 7, No. 12, pp. 1017-1023, Oct. 2015.  公式リンク  
  
• Man-Rong Li, Mark Croft, Peter W. Stephens, Meng Ye, David Vanderbilt, Maria Retuerto, Zheng Deng, Christoph P. Grams, Joachim Hemberger, Joke Hadermann, Wen-Min Li, Chang-Qing Jin, Felix O. Saouma, Joon I. Jang, Hirofumi Akamatsu, Venkatraman Gopalan, David Walker, Martha Greenblatt. Mn2FeWO6: A New Ni3TeO6-Type Polar and Magnetic Oxide, Advanced Materials, Vol. 27, No. 13, pp. 2177--2181, Feb. 2015.  公式リンク  
  
• Takahiro Kawamoto, Koji Fujita, Ikuya Yamada, Tomohiko Matoba, Sung Joo Kim, Peng Gao, Xiaoqing Pan, Scott D. Findlay, Cédric Tassel, Hiroshi Kageyama, Andrew J. Studer, James Hester, Tetsuo Irifune, Hirofumi Akamatsu, Katsuhisa Tanaka. Room-Temperature Polar Ferromagnet ScFeO3 Transformed from a High-Pressure Orthorhombic Perovskite Phase, Journal of the American Chemical Society, American Chemical Society, Vol. 136, No. 43, pp. 15291-15299, Oct. 2014.  公式リンク  
  
• Hirofumi Akamatsu, Koji Fujita, Toshihiro Kuge, Arnab Sen Gupta, Atsushi Togo, Shiming Lei, Fei Xue, Greg Stone, James M. Rondinelli, Long-Qing Chen, Isao Tanaka, Venkatraman Gopalan, Katsuhisa Tanaka. Inversion Symmetry Breaking by Oxygen Octahedral Rotations in the Ruddlesden-Popper NaRTiO4 Family, Physical Review Letters, American Physical Society, Vol. 112, No. 18, pp. 187602, May 2014.  公式リンク  
  
• Yuko Nakatsuka, Hirofumi Akamatsu, Shunsuke Murai, Koji Fujita, Katsuhisa Tanaka. Superspin glass behavior of amorphous FeO-SiO2 thin films, Japanese Journal of Applied Physics, IOP Publishing, Vol. 53, No. 5S1, pp. 05FB11, Apr. 2014.
• Katsuhisa Tanaka, Koji Fujita, Yuya Maruyama, Yoshiro Kususe, Hideo Murakami, Hirofumi Akamatsu, Yanhua Zong, Shunsuke Murai. Ferromagnetism induced by lattice volume expansion and amorphization in EuTiO3 thin films, Journal of Materials Research, Cambridge University Press, Vol. 28, No. 08, pp. 1031--1041, Mar. 2014.
• Yasuhide Akizuki, Ikuya Yamada, Koji Fujita, Hirofumi Akamatsu, Tetsuo Irifune, Katsuhisa Tanaka. AgCu3V4O12: a Novel Perovskite Containing Mixed-Valence Silver ions, Inorganic chemistry, American Chemical Society, Vol. 52, No. 24, pp. 13824--13826, Dec. 2013.
• Takahiro Kawamoto, Koji Fujita, Hirofumi Akamatsu, Tetsuya Nakamura, Toyohiko Kinoshita, Masaichiro Mizumaki, Naomi Kawamura, Motohiro Suzuki, Yoshiro Kususe, Shunsuke Murai, Katsuhisa Tanaka. Ferromagnetic amorphous oxides in the EuO-TiO2 system studied by the Faraday effect in the visible region and the x-ray magnetic circular dichroism at the Eu M 4, 5 and L 2, 3 edges, Physical Review B, American Physical Society, Vol. 88, No. 2, pp. 024405, July 2013.  公式リンク  
  
• A Winterstein, H Akamatsu, D Möncke, K Tanaka, MA Schmidt, L Wondraczek. Magnetic and magneto-optical quenching in (Mn2+, Sr2+) metaphosphate glasses, Optical Materials Express, Optical Society of America, Vol. 3, No. 2, pp. 184--193, Jan. 2013.
• Hirofumi Akamatsu, Koji Fujita, Yuko Nakatsuka, Shunsuke Murai, Katsuhisa Tanaka. Magneto-optical properties of Eu2+-containing aluminoborosilicate glasses with ferromagnetic interactions, Optical Materials, North-Holland, Vol. 35, No. 11, pp. 1997--2000, Dec. 2012.
• Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba, Koji Fujita, Katsuhisa Tanaka, Isao Tanaka. Strong Spin-Lattice Coupling Through Oxygen Octahedral Rotation in Divalent Europium Perovskites, Advanced Functional Materials, WILEY-VCH Verlag, Vol. 23, No. 15, pp. 1864--1872, Nov. 2012.
• Hirofumi Akamatsu, Koji Fujita, Hiroyuki Hayashi, Takahiro Kawamoto, Yu Kumagai, Yanhua Zong, Koji Iwata, Fumiyasu Oba, Isao Tanaka, Katsuhisa Tanaka. Crystal and Electronic Structure and Magnetic Properties of Divalent Europium Perovskite Oxides EuMO3 (M= Ti, Zr, and Hf): Experimental and First-Principles Approaches, Inorganic chemistry, American Chemical Society, Vol. 51, No. 8, pp. 4560--4567, Apr. 2012.
• Hirofumi Akamatsu, Jun Kawabata, Koji Fujita, Shunsuke Murai, Katsuhisa Tanaka. Magnetic properties of oxide glasses containing iron and rare-earth ions, Physical Review B, APS, Vol. 84, No. 14, pp. 144408, Oct. 2011.
• Yanhua Zong, Koji Fujita, Hirofumi Akamatsu, Seisuke Nakashima, Shunsuke Murai, Katsuhisa Tanaka. Local Structure of Amorphous EuO-TiO2 Thin Films Probed by X-Ray Absorption Fine Structure, Journal of the American Ceramic Society, Vol. 95, No. 2, pp. 716--720, Sept. 2011.
• Hirofumi Akamatsu, Y. Kumagai, F. Oba, Koji Fujita, Hideo Murakami, Katsuhisa Tanaka, I. Tanaka. Antiferromagnetic superexchange via 3d states of titanium in EuTiO3 as seen from hybrid Hartree-Fock density functional calculations, Physical Review B, American Physical Society, Vol. 83, No. 21, pp. 214421, June 2011.
• Yanhua Zong, Koji Fujita, Hirofumi Akamatsu, Shunsuke Murai, Katsuhisa Tanaka. Ferromagnetic properties with reentrant spin-glass behavior in amorphous EuZrO3 thin film, physica status solidi (c), Wiley Online Library, Vol. 8, No. 11-12, pp. 3051--3054, Mar. 2011.
• Hirofumi Akamatsu, Koji Fujita, Yanhua Zong, Naohiro Takemoto, Shunsuke Murai, Katsuhisa Tanaka. Impact of amorphization on the magnetic properties of EuO-TiO2 system, Physical Review B, American Physical Society, Vol. 82, No. 22, pp. 224403, Dec. 2010.
• Yanhua Zong, Kazuma Kugimiya, Koji Fujita, Hirofumi Akamatsu, Kazuyuki Hirao, Katsuhisa Tanaka. Preparation and magnetic properties of amorphous EuTiO3 thin films, Journal of Non-Crystalline Solids, North-Holland, Vol. 356, No. 44, pp. 2389--2392, June 2010.
• Hirofumi Akamatsu, Koji Fujita, Shunsuke Murai, Katsuhisa Tanaka. Ferromagnetic Eu2+-based oxide glasses with reentrant spin glass behavior, Physical Review B, American Physical Society, Vol. 81, No. 1, pp. 014423, Jan. 2010.
• Hirofumi Akamatsu, Satoshi Oku, Koji Fujita, Shunsuke Murai, Katsuhisa Tanaka. Magnetic properties of mixed-valence iron phosphate glasses, Physical Review B, APS, Vol. 80, No. 13, pp. 134408, Oct. 2009.
• Yanhua Zong, Koji Fujita, Hirofumi Akamatsu, Shunsuke Murai, Katsuhisa Tanaka. Antiferromagnetism of perovskite EuZrO3, Journal of Solid State Chemistry, Academic Press, Vol. 183, No. 1, pp. 168--172, Oct. 2009.
• Yasuaki Tokudome, Kazuki Nakanishi, Kazuyoshi Kanamori, Koji Fujita, Hirofumi Akamatsu, Teiichi Hanada. Structural characterization of hierarchically porous alumina aerogel and xerogel monoliths, Journal of colloid and interface science, Elsevier, Vol. 338, No. 2, pp. 506--513, June 2009.
• Hirofumi Akamatsu, Yanhua Zong, Yosefu Fujiki, Kazuaki Kamiya, Koji Fujita, Shunsuke Murai, Katsuhisa Tanaka. Structural and Magnetic Properties of Thin Films Fabricated via Sputtering Method, Magnetics, IEEE Transactions on, IEEE, Vol. 44, No. 11, pp. 2796--2799, Dec. 2008.
• Hirofumi Akamatsu, Koji Fujita, Shunsuke Murai, Katsuhisa Tanaka. Magneto-optical properties of transparent divalent iron phosphate glasses, Applied Physics Letters, American Institute of Physics, Vol. 92, No. 25, p. 251908, June 2008.
• Hirofumi Akamatsu, Katsuhisa Tanaka, Koji Fujita, Shunsuke Murai. Magnetic phase transitions in Fe2O3-Bi2O3-B2O3 glasses, Journal of Physics: Condensed Matter, IOP Publishing, Vol. 20, No. 23, pp. 235216, May 2008.
• Hirofumi Akamatsu, Shunsuke Murai, Koji Fujita, Katsuhisa Tanaka. Magnetic Properties of Amorphous Fe2O3-R2O3 (R= La, Gd and Tb) Thin Films Fabricated by Sputtering Method, Advanced Materials Research, Vol. 39, pp. 207--212, Apr. 2008.
• Katsuhisa Tanaka, Hirofumi Akamatsu, Seisuke Nakashima, Koji Fujita. Magnetic properties of disordered oxides with iron and manganese ions, Journal of Non-Crystalline Solids, Elsevier, Vol. 354, No. 12, pp. 1347--1352, Nov. 2007.
• Hirofumi Akamatsu, Katsuhisa Tanaka, Koji Fujita, Shunsuke Murai. Spin dynamics in oxide glass of Fe 2O3-Bi2O3-B2O3 system, Journal of Magnetism and Magnetic Materials, North-Holland, Vol. 310, No. 2, pp. 1506--1507, Nov. 2006.
• Hirofumi Akamatsu, Katsuhisa Tanaka, Koji Fujita, Shunsuke Murai. Spin dynamics in Fe2O3-TeO2 glass: Experimental evidence for an amorphous oxide spin glass, Physical Review B, American Physical Society, Vol. 74, No. 1, pp. 012411, July 2006.

国際会議発表 (査読有り)

• Yasuhide Mochizuki, Yu Kumagai, Hirofumi Akamatsu, Fumiyasu Oba. Polar-Metal Phases in Strained Antiperovskites: A First-principles Study, The 6th International Symposium on Advanced Microscopy and Theoretical Calculations (AMTC-6), June 2019.

国際会議発表 (査読なし・不明)

• Yasuhide Mochizuki, Yu Kumagai, Hirofumi Akamatsu, Fumiyasu Oba. Polar metallic behavior in strained antiperovskites: A first-principles study, First Annual Symposium of the Tokyo Tech - UCL - McGill core-to-core collaboration Defect Functionalized Sustainable Energy Materials: From Design to Devices Application, Feb. 2019.
• Yasuhide Mochizuki, Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba. First-Principles Study of Compressive Strain-Induced Metal-Insulator Transition in La3Ni2O7, The 6th International Education Forum on Environment and Energy Science, Dec. 2017.
• Y. Mochizuki, H. Akamatsu, Y. Kumagai, F. Oba. Peierls instability of a layered perovskite La3Ni2O7 under biaxial compressive strain via first-principles calculations, Car-Parrinello Molecular Dynamics (CPMD) 2017, Oct. 2017.
• Y. Mochizuki, H. Akamatsu, Y. Kumagai, F. Oba. Metal-insulator transition with structural distortion in a layered perovskite La3Ni2O7: A first-principles study, Frontiers in Materials Science 2017, Sept. 2017.
• Y. Mochizuki, H. Akamatsu, Y. Kumagai, F. Oba. First-principles study of strain-induced metal-insulator transition in a lanthanum nickelate layered perovskite, International Conference on Materials and Systems for Sustainability (ICMaSS) 2017, Sept. 2017.
• Y. Mochizuki, H. Akamatsu, Y. Kumagai, F. Oba. Metal-insulator phase transition induced by biaxial compressive strain in La3Ni2O7: A first-principles study, The Tenth International Conference on the Science and Technology for Advanced Ceramics (STAC-10), Aug. 2017.
• N. Nishiya, K. Harada, Y. Kumagai, H. Akamatsu, F. Oba. Theoretical study of doping limits in semiconductors, The Tenth International Conference on the Science and Technology for Advanced Ceramics (STAC-10), Aug. 2017.
• Y. Mochizuki, H. Akamatsu, Y. Kumagai, F. Oba. First-principles study of structural distortion in a layered perovskite La3Ni2O7, The International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation, Oct. 2016.

国内会議発表 (査読なし・不明)

• 望月 泰英, 赤松 寛文, 熊谷 悠, Ha-Jun Sung, 高橋 亮, 永井 隆之, 谷口 博基, 大場 史康. 第一原理格子動力学計算を用いたペロブスカイト物質の構造探索, 第40回電子材料研究討論会, Nov. 2020.
• 望月 泰英, 熊谷 悠, 赤松 寛文, 大場 史康. 第一原理計算によるアンチペロブスカイトの歪誘起ポーラーメタル相の理論予測, 日本金属学会2020年春期講演大会, Mar. 2020.
• Yasuhide Mochizuki, Yu Kumagai, Hirofumi Akamatsu, Fumiyasu Oba. Strain-induced Peierls transition and polar-metal phases in Ni-based perovskites, 第3回動的平均場近似計算に関する情報交流会, Dec. 2019.
• 望月 泰英, 熊谷 悠, 赤松 寛文, 大場 史康. 第一原理計算によるアンチペロブスカイトのポーラーメタル相の予測, 第28回日本MRS年次大会, Dec. 2018.
• Yasuhide Mochizuki, Hirofumi Akamatsu, Yu Kumagai, Fumiyasu Oba. Peierls Instability of Layered Perovskite La3Ni2O7 under Epitaxial Strain from First Principles, 第56回セラミックス基礎科学討論会, Jan. 2018.
• 望月 泰英, 赤松 寛文, 熊谷 悠, 大場 史康. 第一原理計算によるLa3Ni2O7の圧縮面内歪誘起金属絶縁体転移, 第27回日本MRS年次大会, Dec. 2017.
• 西谷宣彦, 原田航, 熊谷悠, 赤松寛文, 大場史康. 化合物半導体における点欠陥形成とドーピング限界の理論的検討, 日本金属学会2017年春期講演大会, Mar. 2017.
• 望月泰英, 赤松寛文, 熊谷悠, 大場史康. 第一原理計算による層状ペロブスカイトLa3Ni2O7の面内歪下における安定結晶構造探, 日本金属学会2017年春期講演大会, Mar. 2017.
• 望月 泰英, 赤松 寛文, 熊谷 悠, 大場 史康. 第一原理計算による層状ペロブスカイトLa3Ni2O7の構造不安定性, 第26回日本MRS年次大会, Dec. 2016.
• 赤松 寛文, B. K. VanLeewen, I. Dabo, 熊谷 悠, 大場 史康, L.-Q. Chen, V. Gopalan. 表現理論と第一原理計算に基づいたPbTiO3における180°強誘電ドメイン壁移動パスの探索, 第26回日本MRS年次大会, Dec. 2016.
• 西谷 宣彦, 原田 航, 熊谷 悠, 赤松寛文, 大場 史康. 半導体におけるドーピング限界の理論的研究, 第26回日本MRS年次大会, Dec. 2016.
• 望月泰英, 赤松寛文, 熊谷悠, 大場史康. 第一原理計算による層状ペロブスカイト酸化物の基底状態構造探索, 日本金属学会2016年（第159回）秋期講演大会, Sept. 2016.
• 西谷宣彦, 原田航, 熊谷悠, 赤松寛文, 大場史康. 第一原理計算による化合物半導体のドーピング限界の検討, 日本金属学会2016年（第159回）秋期講演大会, Sept. 2016.

学位論文

• Magnetic Properties of Amorphous Oxides and Related Materials,  Thesis,  Doctor (Engineering),  Kyoto University,  2009/03/24, 

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