Mario OKAWA

Ph.D. Student, Shin Group
Institute for Solid State Physics and
Department of Advanced Materials Science, Graduate School of Frontier Sciences,
University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

m-okawa(at)issp.u-tokyo.ac.jp
(Replace "(at)" with "@")

Supervisor: Prof. Shik Shin

Education

M.S., Advanced Materials Science, University of Tokyo, 2008
B.S., Applied Physics, Tokyo University of Science, 2006

Research Interests

Photoemission spectroscopy of correlated materials, especially high-temperature superconductors and heavy-fermion materials

Publications

Strong valence fluctuation in the quantum critical heavy fermion superconductor β-YbAlB₄: A hard x-ray photoemission study
M. Okawa, M. Matsunami, K. Ishizaka, R. Eguchi, M. Taguchi, A. Chainani, Y. Takata, M. Yabashi, K. Tamasaku, Y. Nishino, T. Ishikawa, K. Kuga, N. Horie, S. Nakatsuji, and S. Shin
Phys. Rev. Lett. 104, 247201 (2010)

Orbital-dependent modifications of electronic structure across the magnetostructural transition in BaFe₂As₂
T. Shimojima, K. Ishizaka, Y. Ishida, N. Katayama, K. Ohgushi, T. Kiss, M. Okawa, T. Togashi, X.-Y. Wang, C.-T. Chen, S. Watanabe, R. Kadota, T. Oguchi, A. Chainani, and S. Shin
Phys. Rev. Lett. 104, 057002 (2010)

Superconducting electronic state in optimally doped YBa₂Cu₃O_7-δ observed with laser-excited angle-resolved photoemission spectroscopy
M. Okawa, K. Ishizaka, H. Uchiyama, H. Tadatomo, T. Masui, S. Tajima, X.-Y. Wang, C.-T. Chen, S. Watanabe, A. Chainani, T. Saitoh, and S. Shin
Phys. Rev. B 79, 144528 (2009)

Electronic structure of superconducting FeSe studied by high-resolution photoemission spectroscopy
R. Yoshida, T. Wakita, H. Okazaki, Y. Mizuguchi, S. Tsuda, Y. Takano, H. Takeya, K. Hirata, T. Muro, M. Okawa, K. Ishizaka, S. Shin, H. Harima, M. Hirai, Y. Muraoka, and T. Yokoya
J. Phys. Soc. Jpn. 78, 034708 (2009)

Superconducting gap and valence band of Mg₁₀Ir₁₉B₁₆ studied by laser and synchrotron photoemission spectroscopy
R. Yoshida, H. Okazaki, K. Iwai, K. Noami, T. Muro, M. Okawa, K. Ishizaka, S. Shin, Z. Li, J. Luo, G.-q. Zheng, T. Oguchi, M. Hirai, Y. Muraoka, and T. Yokoya
J. Phys. Soc. Jpn. 78, 034705 (2009)

Temperature-dependent pseudogap in the oxypnictides LaFeAsO_1-xF_x and LaFePO_1-xF_x seen via angle-integrated photoemission
Y. Ishida, T. Shimojima, K. Ishizaka, T. Kiss, M. Okawa, T. Togashi, S. Watanabe, X.-Y. Wang, C.-T. Chen, Y. Kamihara, M. Hirano, H. Hosono, and S. Shin
Phys. Rev. B 79, 060503(R) (2009)

Doping-dependence of nodal quasiparticle properties in high-T_c cuprates studied by laser-excited angle-resolved photoemission spectroscopy
K. Ishizaka, T. Kiss, S. Izumi, M. Okawa, T. Shimojima, A. Chainani, T. Togashi, S. Watanabe, C.-T. Chen, X. Y. Wang, T. Mochiku, T. Nakane, K. Hirata, and S. Shin
Phys. Rev. B 77, 064522 (2008)

Proceedings:

Bulk-sensitive laser-ARPES study on the cuprate superconductor YBa₂Cu₃O_7-δ
M. Okawa, K. Ishizaka, H. Uchiyama, H. Tadatomo, T. Masui, S. Tajima, X.-Y. Wang, C.-T. Chen, S. Watanabe, A. Chainani, T. Saitoh and S. Shin
Physica C (in press)

Bulk-sensitive spectroscopic studies on noncentrosymmetric superconducting system of Mg-Ir-B
R. Yshida, H. Okazaki, K. Iwai, K. Noami, T. Muro, M. Okawa, K. Ishizaka, S. Shin, Z. Li, J. L. Luo, G.-Q. Zheng, T. Oguchi, M. Hirai, Y. Muraoka, and T. Yokoya
Physica C 469, 1034 (2009)

Momentum dependence of the energy gap in the superconducting state of optimally doped Bi₂(Sr,R)₂CuO_y (R = La and Eu)
Y. Okada, T. Takeuchi, M. Ohkawa, A. Shimoyamada, K. Ishizaka, T. Kiss, S. Shin, and H. Ikuta
J. Phys.: Conf. Ser. 150, 052197 (2009)

Unusual pseudogap features observed in iron oxypnictide superconductors
Y. Ishida, T. Shimojima, K. Ishizaka, T. Kiss, M. Okawa, T. Togashi, S. Watanabe, X.-Y. Wang, C.-T. Chen, Y. Kamihara, M. Hirano, H. Hosono, and S. Shin
J. Phys. Soc. Jpn. 77, Suppl. C, 61 (2008)

Oral Presentation

VUV laser-excited angle-resolved photoemission study on the superconducting state in YBa₂Cu₃O_7-δ
M. Okawa, K. Ishizaka, T. Kiss, T. Shimojima, T. Togashi, S. Watanabe, H. Uchiyama, T. Masui, S. Tajima, T. Saitoh, and S. Shin
15th International Conference on Vacuum Ultraviolet Radiation Physics (Berlin, July 29-Aug. 3, 2007)

Poster Presentations

Bulk-sensitive laser-ARPES study on the cuprate superconductor YBa₂Cu₃O_7-δ
M. Okawa, K. Ishizaka, T. Kiss, T. Shimojima, T. Togashi, S. Watanabe, H. Uchiyama, T. Masui, S. Tajima, A. Chainani, T. Saitoh, and S. Shin
9th International Conference on Materials and Mechanisms of Superconductivity (Tokyo, Sep. 7-12, 2009)

Strong Kondo screening near the quantum critical point in heavy fermion superconductor β-YbAlB₄ studied by hard x-ray photoemission spectroscopy
M. Okawa, M. Matsunami, K. Ishizaka, R. Eguchi, M. Taguchi, A. Chainani, Y. Takata, M. Yabashi, K. Tamasaku, Y. Nishino, T. Ishikawa, K. Kuga, N. Horie, S. Nakatsuji, and S. Shin
9th International Conference on Materials and Mechanisms of Superconductivity (Tokyo, Sep. 7-12, 2009)