論文

• S. Okubo, K. Segawa, K. Naka, T. Suzuki, S. Hara, T. Sakurai, H. Ohta, M. Matsumoto, N. Kurita, H. Tanaka. High Frequency ESR Measurements of S=1 Spin Gap System CsFeCl3, JPS Conference Proceedings, Vol. 38, pp. 011137, July 2023.
• R. Okuto, E. Ohki, Takahiro Sakurai, K. Hijii, H. Takahashi, Eiji Ohmichi, S. Okubo, H. Ohta, HIDEKAZU TANAKA. Development of High‑Field and High‑Pressure ESR System and Application to Triangular Antiferromagnet CsCuCl3, Appl. Magn. Res., Vol. 50, p. 1059-1065, May 2019.  公式リンク  
  
• T. Sakurai, K. Fujimoto, R. Matsui, K. Kawasaki, S. Okubo, H. Ohta, K. Matsubayashi, Y. Uwatoko, H. Tanaka. Development of multipfrequency ESR system for high-pressure measurements up to 2.5 GPa, J. Magn. Reson., 259, 108-113, Aug. 2015.  公式リンク  
  
• K. Matsui, M. Fujisawa, K. Hagiwara, Y. Hoshino, T. Goto, T. Sasaki, H. Tanaka, S. Okubo, H. Ohta. Ground State of the Spin-1/2 Chain of Green Dioptase at High Fields, JPS Conf. Proc., 3, 014011 (1-6), June 2014.  公式リンク  
  
• S. Okubo, Tomonari Ueda, H. Ohta, Weimin Zhang, T. Sakurai, Nozomi Onishi, Masaki Azuma, Yuichi Shimakawa, Hiroki Nakano, T. Sakai. Dzyaloshinsky-Moriya interaction and field-induced magnetic order in an antiferromagnetic honeycomb lattice compound Bi3Mn4O12(NO3) studied by high-field electron spin resonance, PHYSICAL REVIEW B, Vol. 86, No. 140401, pp. 1-4, Oct. 2012.
• Sonia Sharmin, I. Umegaki, H. Tanaka, T. Ono, G. Tanaka, H. Nojiri, M. Fujisawa, N. Matsumi, M. Tomoo, S. Okubo, H. Ohta, T. Sakurai. Antiferromagnetic resonance modes for the S =1/2 kagome antiferromagnet Cs2Cu3SnF12, J. Phys: Conf. Ser., 302, 012011 (1-4), July 2011.  公式リンク  
  
• T. Sakurai, T. Horie, M. Tomoo, K. Kondo, N. Matsumi, S. Okubo, H. Ohta, Y. Uwatoko, K. Kudo, Y. Koike, H. Tanaka. Development of high-pressure, high-field and multi-frequency ESR apparatus and its application to quantum spin system, J. Phys: Conf. Ser., 215, 012184 (1-4), Mar. 2010.  公式リンク  
  
• M. Fujisawa, K. Shiraki, S. Okubo, H. Ohta, M. Yoshida, H. Tanaka, T. Sakai. Dzyaloshinsky-Moriya interaction in the S=1/2 quasi one-dimensional antiferromagnet Cu₂Cl₄•H₈C₄SO₂ as determined via high frequency ESR, Phys. Rev. B, Vol. 80, pp. 012408 (1-4), 2009.
• H. Ohta, M. Fujisawa, N. Souda, S. Okubo, E. Ohmichi, T. Sakurai, H. Kikuchi, Toshio Ono, H. Tanaka, K. Matsubayashi, Y. Uwatoko. Magnetic Susceptibility Measurement Under High Pressure and Magnetization Measurement of S=1/2 Dioptase Lattice Antiferromagnet, J. Phys: Conf. Ser., Vol. 150, pp. 042151 (1-4), 2009.
• H. Ohta, S. Okubo, N. Souda, M. Tomoo, T. Sakurai, T. Yoshida, E. Ohmichi, M. Fujisawa, H. Tanaka, R. Kato. Development and Applications of High-Frequency ESR up to 55 T, Appl. Magn. Reson., Vol. 35, pp. 399-410, 2009.
• H. Ohta, S. Okubo, K. Shiraki, Makoto Yoshida, A. A. Belik, M. Azuma, M. Takano. High field ESR measurements on one dimensional antiferromagnetic zigzag chain systems., J. Korean Phys. Soc, Vol. 53, pp. 999-1005, 2008.
• Shojiro Kimura, Hirofumi Ishikawa, Y. Inagaki, M. Yoshida, S. Okubo, H. Ohta, H. nojiri, A.A. Belik, M. Azuma, M. Takano. ESR Measurements on One-Dimensional Quantum Ferrimagnets A3Cu3(PO4)4 with A=Sr and Ca in Submillimeter-Wave Region, J. Phys. Soc. Jpn., Vol. 75, No. 9, pp. 094718-1-094718-7, 2006.
• A.A. Belik, M. Azuma, A. Matsuo, S. Okubo, H. Ohta, K. Kindo, M. Takano, Kaji. Crystal Structure and Properties of Phosphate PbCu2(PO4)2 with Spin-Singlet Ground State, Phys. Rev., 73, Vol. 73, No. 2, pp. 024429-1-024429-7, 2006.
• Y. Inagaki, Y. Narumi, K. Kindo, H. Kikuchi, T. Kamikawa, T. Kunimoto, S. Okubo, H. Ohta, T. Saito, M. Azuma, M. Takano, H. Nojiri, M Kaburagi, Takashi Tonegawa. Ferro-Antiferromagnetic Delta-Chain System Studied by High Field Magnetization Measurements, J. Phys. Soc. Jpn., Vol. 74, No. 10, pp. 2831-283, 2005.
• S. Okubo, Akio Taketani, H. Ohta, T. Kunimoto, Y. Inagaki, T. Saito, M. Azuma, M. Takano, H. Kikuchi. High Field ESR Measurements of S=1/2 Diamond Chain Substance Cu3(CO3)2(OH)2 at the Magenetization Plateau Region, Progress of Theoretical Physics Supplement, No. 159, pp. 11-16, 2005.
• K. Shiraki, M. Yoshida, S. Okubo, H. Ohta, A.A. Belik, M. Azuma, M. Takano. High Field ESR Measurements of MCuP2O7 (M=Sr, Pb), Progress of Theoretical Physics Supplement, No. 159, pp. 168-172, 2005.
• Kaji, S. Okubo, H. Ohta, Yuhji Inagaki, A.A. Belik, M. Azuma, M. Takano. High Field ESR Measurements of Spin Gap System MCu2(PO4)2, J. Phys. & Chem. Solids,, Vol. 66, No. 11, pp. 2068-2071, 2005.
• A.A. Belik, M. Azuma, A. Matsuo, Whangbo M.-H., Koo H.-J., Kikuchi J., Tomoyuki Kaji, S. Okubo, H. Ohta, K. Kindo, M. Takano. Investigation of the Crystal Structure and the Structural and Magnetic Properties of SrCu2(PO4)2, Inorg. Chem., Vol. 44, No. 19, pp. 6632-6640, 2005.
• Kensaku Hiraka, Yuta Nagasaka, T. Kunimoto, Y. Inagaki, S. Okubo, H. Ohta, T. Saito, M. Azuma, M. Takano. Magnetic Phase Transition of High-Pressure Phase (VO)2P2O7 Studied by High-Field ESR Measurements, J. Mag. Mag. Mat., Vol. 272-276, No. 1, pp. e1675-e1676, 2004.
• H. Ohta, S. Okubo, Tomohisa Kamikawa, Takashi Kunimoto, Y. Inagaki, H. Kikuchi, T. Saito, M. Azuma, M. Takano. High Field ESR Study of the S=1/2 Diamond-Chain Substance Cu3(CO3)2(OH)2 up to the Magnetization Plateau Region, J. Phys. Soc. Jpn., Vol. 72, No. 10, pp. 2464-2467, 2003.
• T. Kamikawa, S. Okubo, T. Kunimoto, H. Ohta, Y. Inagaki, H. Kikuchi, T. Saito, M. Azuma, M. Takano. High Field ESR Measurement of Diamond Chain Substance Cu3(OH)2(CO3)2, Physica B, Vol. 329-333, No. 2, pp. 988-989, 2003.
• T. Kunimoto, T. Kamikawa, Y. Inagaki, S. Okubo, H. Ohta, H. Kikuchi, T. Saito, M. Azuma, M. Takano. ESR Study of Frustrared Δ-Chain System, Physica B, Vol. 329-333, No. 2, pp. 1057-1058, 2003.
• H. Ohta, S. Okubo, T. Sakurai, T. Goto, K. Kirita, K. Ueda, Y. Uwatoko, T. Saito, M. Azuma, M. Takano, J. Akimitsu. High-Frequency ESR Measurements Using Pulsed Magnetic Fields in Kobe, Physica B, Vol. 294-295, pp. 624-629, 2001.

著書

• S. Okubo, K. Hazuki, T. Sakurai, H. Ohta, H. Yoshida, M. Azuma, M. Takano. Millimeter and Submillimeter wave ESR Measurement of Spin Ladder System Sr(Cu1-xZnx)2O3, EPR in the 21st Century, Elsevier Science B.V, pp. 747-750, 2002.

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