1. High-field electron spin resonance (ESR) study of low-dimensional quantum spin systems
2. Magneto-optical study of low-dimensional organic conductors
3. Instrumentations for the generation of pulsed high magnetic fields
4. ESR study of diluted magnetic semiconductors
5. Millimeter wave spectroscopy of electrode materials for Li secondary battery

Main Publications

1. "High Field Phase Transitions of Quasi One Dimensional S=1/2 Heisenberg Antiferromagnet Cu2(1,4-diazacycloheptane)2Cl4 Observed by Submillimeter Wave ESR," H. Ohta, T. Tanaka, S. Okubo, S. Kimura, H. Kikuchi and H. Nagasawa, J. Phys. Soc. Jpn. 68(3) (1999) 732-735.
2. "Observation of High Order Harmonic Resonances in Magneto-optical Measurements of (BEDT-TTF)2Br(DIA)," Y. Oshima, H. Ohta, K. Koyama, M. Motokawa, H. M. Yamamoto and R. Kato, J. Phys. Soc. Jpn. 71(4) (2002) 1031-1034.
3. "High Frequency ESR Measurements Using Pulsed Magnetic Fields in Kobe," H. Ohta, S. Okubo, T. Sakurai, T. Goto, K. Kirita, K. Ueda, Y. Uwatoko, T. Saito, M. Azuma, M. Takano and J. Akimitsu, Physica B 294-295 (2001) 624-629.
4. "ESR Study of GaAs:Er codoped with Oxygen Grown by Organometallic Vapor Phase Epitaxy," J. Yoshikawa, C. Urakawa, H. Ohta, T. Koide, T. Kawamoto, Y. Fujiwara and Y. Takeda, Physica E 10 (2001) 395-398.
5. "Millimeter Wave Reflection Measurement of Secondary Battery Substance LiNiO2," H. Ohta, A. Ueda, S. Ono, Y. Ikeuchi, T. Nanba, A. Hirano and R. Kanno, Jpn. J. Applied Phys. 39 (2000) Suppl. 39-1, 409-410.