原著論文
Paper
筆頭論文、共著論文ともに記載しています。
【2024年】
45. Yuki K. Wakabayashi, Masaki Kobayashi, Yuichi Seki, Yoshinori Kotani, Takuo Ohkochi, Kohei Yamagami, Miho Kitamura, Yoshitaka Taniyasu, Yoshiharu Krockenberger, and Hideki Yamamoto, "Magnetic anisotropy driven by ligand in 4d transition-metal oxide SrRuO3", APL Mater. 12. 041119 (2024).
44. Kohei Yamagami, Hiroki Ueda, Urs Staub, Yujun Zhang, Kohei Yamamoto, Sang Han Park, Soonnam Kwon, Akihiro Mitsuda, Hirofumi Wada, Takayuki Uozumi, Kojiro Mimura, and Hiroki Wadati, "4f electron temperature driven ultrafast electron localization", Phys. Rev. Research, accepted (2024).
43. Hiroaki Tanaka, Shota Okazaki, Masaru Kobayashi, Yuto Fukushima, Yosuke Arai, Takushi Iimori, Mikk Lippmaa, Kohei Yamagami, Yoshinori Kotani, Fumio Komori, Kenta Kuroda, Takao Sasagawa, and Takeshi Kondo, "Broken Screw Rotational Symmetry in the Near-Surface Electronic Structure of AB-Stacked Crystals", Phys. Rev. Lett. 132. 136402 (2024).
【2023年】
42. H. Fujiwara, Y. Nakatani, H. Aratani, Y. Kanai-Nakata, K. Yamagami, S. Hamamoto, T. Kiss, A. Sekiyama, A. Tanaka, T. Ebihara, and Y. Saitoh, "Polarization dependence of soft x-ray absorption spectroscopy on the heavy fermion superconductor CeNi2Ge2" New Physics: Sae Mulli, 73, 1062 (2023).
41. H. Fujiwara, Y. Nakatani, H. Aratani, Y. Kanai-Nakata, K. Yamagami, S. Hamamoto, T. Kiss, A. Yamasaki, A. Higashiya, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Yasui, H. Yamagami, J. Miyawaki, A. Miyake, T. Ebihara, Y. Saitoh, and A. Sekiyama, "Impact of the ground-state 4 f symmetry for anisotropic c f hybridization in the heavy-fermion superconductor CeNi2Ge2", Phys Rev B 108, 165121 (2023). [Editor's suggestion]
40. Masahiro Kouno, Naoto Kuwamura, Nobuto Yoshinari, Tatsuhiro Kojima, Malcolm A. Halcrow, Kohei Yamagami, Akira Sekiyama, and Takumi Konno, "Jahn–Teller Switching of a Redox-Active Nickel(III) Center in a Homoleptic Thiolato Metalloligand Environment", Inorg. Chem. 62, 9463 (2023).
39. Kouta Kazama, Masato Sakano, Kohei Yamagami, Takuo Ohkochi, Kyoko Ishizaka, Terumasa Tadano, Yusuke Kozuka, Hidetoshi Yoshizawa, Yoshihiro Tsujimoto, Kazunari Yamaura, and Jun Fujioka, "Charge transport and thermopower in the electron-doped narrow gap semiconductor Ca1−xLaxPd3O4", Phys. Rev. Materials 7, 085402 (2023).
38. Yujun Zhang, Ji Ma, Keisuke Ikeda, Yasuyuki Hirata, Kohei Yamagami, Christian Schüßler-Langeheine, Niko Pontius, Haojie Han, Yuanhua Lin, Cewen Nan, and Hiroki Wadati, "Photocarrier transport of ferroelectric photovoltaic thin films detected by the magnetic dynamics of adjacent ferromagnetic layers", Phys. Rev. B 107, L220303 (2023).
37. Tomoharu Ohta, Kaito Kurokawa, Nan Jiang, Kohei Yamagami, Yoshinori Okada, and Yasuhiro Niimi, "Enhancement of spin–flop-induced magnetic hysteresis in van der Waals magnet (Fe1−xCox)5GeTe2", Appl. Phys. Lett. 122. 152402 (2023).
36. Y. Fujisawa, M. Pardo-Almanza, C. H. Hsu, A. Mohamed, K. Yamagami, A. Krishnadas, F. C. Chuang, K. H. Khoo, J. Zang, A. Soumyanarayanan, and Y. Okada, "Widely tunable Berry curvature in the Magnetic Semimetal Cr1+δTe2", Adv. Mater. 35. 2207121 (2023).
34. Amina A. Abozeed, Denis I. Gorbunov, Toshiharu Kadono, Yuina Kanai-Nakata, Kohei Yamagami, Hidenori Fujiwara, Akira Sekiyama, Atsushi Higashiya, Atsushi Yamasaki, Kenji Tamasaku, Makina Yabashi, Tetsuya Ishikawa, Hirofumi Wada, Alexander V. Andreev, Shin Imada, "Anisotropic magnetization and electronic structure of the first-order ferrimagnet ErCo2 studied by polarization dependent hard X-ray photoemission spectroscopy", Physica B 649. 414465 (2023).
【2022年】
34. Yue Wang, Shun Kajihara, Hideki Matsuoka, Bruno Kenichi Saika, Kohei Yamagami, Yukiharu Takeda, Hiroki Wadati, Kyoko Ishizaka, Yoshihiro Iwasa, and Masaki Nakano, "Layer-Number-Independent Two-Dimensional Ferromagnetism in Cr3Te4", Nano Lett. 22. 9964 (2022).
33. Y. Zhang, J. Chen, K. Ikeda, K. Yamagami, Y. Wang, Y. Choi, A. Yasui, J. Mad, Y. Lin, C. Nan, H.Wadati, "Synchrotron X-ray spectroscopic study of the antiferromagnetic-ferromagnetic transition in Ni-doped FeRh epitaxial thin films", J. Alloys Compd., 921, 166080 (2022).
32. K. Yamagami, Y. Fujisawa, M. Pardo-Almanza, B. R. M. Smith, K. Sumida, Y. Takeda, and Y. Okada, "Enhanced d-p hybridization intertwined with anomalous ground state formation in the van der Waals itinerant magnet Fe5GeTe2", Phys. Rev. B 106, 045137 (2022).
31. K. Yamagami, H. Yoshino, H. Yamagishi, H. Setoyama, A. Tanaka, R. Ohtani, M. Ohba, and H. Wadati, “The ligand field in low-crystallinity metal–organic frameworks investigated by soft X-ray core-level absorption spectroscopy”, Phys. Chem. Chem. Phys. 24, 16680 (2022).
30. Y. Zhang, T. Katayama, A. Chikamatsu, C. S.-Langeheine, N. Pontius, Y. Hirata, K. Takubo, K. Yamagami, K. Ikeda, K. Yamamoto, T. Hasegawa, and H. Wadati, "Photo-induced Antiferromagnetic-ferromagnetic and Spin-state Transition in GdBaCo2O5.5 Thin Film", Comm. Phys. 5, 50 (2022).
【2021年】
29. Y. Fukuda, N. Yoshinari, K. Yamagami, and T. Konno, "Transformations of empty CuI4 core to CuI2CuII2O and CuI6S cores via oxide and sulfide insertions", Chem. Comm. 57. 5386 (2021).
28. K. Yamagami, K. Ikeda, A. Hariki, Y. Zhang, A. Yasui, Y. Takagi, Y. Hotta, T. Katase, T. Kamiya, and H. Wadati, "Hard x-ray photoemission study on strain effect in LaNiO3 thin films", Appl. Phys. Lett. 118, 161601 (2021).
27. Y. Uemura, A. Ismail, S. H. Park, S. Kwon, M. Kim, Y. Niwa, H. Wadati, H. Elnaggar, F. Frati, T. Haarman, N. Höppel, N. Huse, Y. Hirata, Y. Zhang, K. Yamagami, S. Yamamoto, I. Matsuda, T. Katayama, T. Togashi, S. Owada, M. Yabashi, U. Halisdemir, G. Koster, T. Yokoyama, B. Weckhuysen, and F. de Groot, "Femtosecond Charge Density Modulations in Photoexcited CuWO4", J. Chem. Phys. C 125. 7329 (2021).
26. H. Yoshino, K. Yamagami, H. Wadati, H. Yamagishi, H. Setoyama, S. Shimoda, A. Mishima, B. Le Ouay, R. Ohtani, and M. Ohba, "Coordination Geometry Changes in Amorphous Cyanide-Bridged MOFs upon Water Adsorption", Inorg. Chem. 60, 3338 (2021).
25. K. Yamagami, Y. Fujisawa, B. Driesen, C. H. Hsu, K. Kawaguchi, H. Tanaka, T. Kondo, Y. Zhang, H. Wadati, K. Araki, T. Takeda, Y. Takeda, T. Muro, F. C. Chuang, Y. Niimi, K. Kuroda, M. Kobayashi, and Y. Okada, "Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2", Phys. Rev. B 103. L060403 (2021).
【2020年】
24. K. Yamagami, K. Ishii, Y. Hirata, K. Ikeda, J. Miyawaki, Y. Harada, M. Miyazaki, S. Asano, M. Fujita, and H. Wadati, "Localized character of charge excitations for La2−xSrxNiO4+δ revealed by oxygen K-edge resonant inelastic x-ray scattering", Phys. Rev. B 102, 165145 (2020).
23. Y. Zhang, Y. Z. Luo, L. Wu, M. Suzuki, Q. Zhang, Y. Hirata, K. Yamagami, K. Takubo, K. Ikeda, K. Yamamoto, A Yasui, N. Kawamura, C. Lin, K. Koshiishi, X. Liu, J. Zhang, Y. Hotta, X. R. Wang, A. Fujimori, Y. Lin, C. Nan, L. Shen, and H. Wadati, "Interfacial-hybridization-modified Ir ferromagnetism and electronic structure in LaMnO3/SrIrO3 superlattices", Phys. Rev. Research 2, 033496 (2020).
22. Y. Fujisawa, M. Pardo-Almanza, J. Garland, K. Yamagami, X. Zhu, X. Chen, K. Araki, T. Takeda, M. Kobayashi, Y. Takeda, C. -H. Hsu, F. -C. Chuang, R. Laskowski, K. H. Khoo, A. Soumyanarayanan, and Y. Okada, "Tailoring magnetism in self-intercalated Cr1+δTe2 epitaxial films", Phys, Rev. Materials 4, 114001 (2020).
21. S. Asano, K. Ishii, K. Yamagami, J. Miyawaki, Y. Harada, and M. Fujita, "Revisit the phase diagram of T*-type La1-x/2Eu1-x/2SrxCuO4 using O K-edge X-ray absorption spectroscopy", J. Phys. Soc. Jpn. 89, 075002 (2020).
20. K. Yamagami, S. Imada, K. Yamanaka, T. Yaji, A. Tanaka, M. Kouno, N. Yoshinari, T. Konno, and A. Sekiyama, "Local 3d electronic states of sulfur-coordinating Ni complexes probed by soft X-ray absorption spectroscopy", JPS Conf. Proc. 30, 011176 (2020).
19. S. Hamamoto, S. Fujioka, Y. Kanai-Nakata, K. Yamagami, K. Kuga, H. Fujiwara, T. Kiss, H. S. Suzuki, A. Higashiya, A. Yamasaki, S. Imada, A. Tanaka, Y. Takeda, Y. Saitoh, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Sekiyama, "Local 4f Electronic Structure in PrAg2In Studied by Polarized X-Ray Absorption and Photoemission Spectroscopy" JPS Conf. Proc. 30, 011113 (2020).
18. A. S. M. Ismail, Y. Uemura, S. H. Park, S. Kwon, M. Kim, H. Elnaggar, F. Frati, Y. Niwa, H. Wadati, Y. Hirata, Y. Zhang, K. Yamagami, S. Yamamoto, I. Matsuda, U. Halisdemir, G. Koster, B. M. Weckhuysen, and F. M. F. de Groot, "Direct observation of the electronic states of photoexcited hematite with ultrafast 2p3d X-ray absorption spectroscopy and resonant inelastic X-ray scattering", Phys. Chem. Chem. Phys. 22, 2685 (2020).
【2019年】
17. K. Yamagami, S. Imada, K. Yamanaka, T. Yaji, A. Tanaka, M. Kouno, N. Yoshinari, T. Konno, and A. Sekiyama, "The prominent charge-transfer effects of trinuclear complexes with nominally high nickel valences", J. Phys. Commun. 3, 125008 (2019).
16. K. Kuga, Y. Kanai H. Fujiwara, K. Yamagami, S. Hamamoto, Y. Aoyama, A. Sekiyama, A. Higashiya, T. Kadono, S. Imada, A. Yamasaki, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Nakatsuji, and T. Kiss, "Linear polarization-dependent core-level photoemission spectroscopy in Yb-based valence fluctuating system", J. Electron Spectrosc. Relat. Phenom. 238, 146889 (2019).
15. K. Kuga, Y. Kanai, H. Fujiwara, K. Yamagami, S. Hamamoto, Y. Aoyama, A. Sekiyama, A. Higashiya, T. Kadono, S. Imada, A. Yamasaki, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, S. Nakatsuji, and T. Kiss, "Effect of Anisotropic Hybridization in YbAlB4 Probed by Linear Dichroism in Core-Level Hard X-Ray Photoemission Spectroscopy", Phys. Rev. Lett. 123, 036404 (2019).
【2018年】
14. H. Aratani, Y. Nakatani, H. Fujiwara, M. Kawada, Y. Kanai, K. Yamagami, S. Fujioka, S. Hamamoto, K. Kuga, T. Kiss, A. Yamasaki, A. Higashiya, T. Kadono, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, A. Yasui, Y. Saitoh, Y. Narumi, K. Kindo, T. Ebihara, and A. Sekiyama, "Revising the 4 f symmetry in CeCu2Ge2: Soft x-ray absorption and hard x-ray photoemission spectroscopy", Phys. Rev. B 98, 121113(R) (2018).
13. A. A. Abozeed, T. Kadono, A. Sekiyama, H. Fujiwara, A. Higashiya, A. Yamasaki, Y. Kanai, K. Yamagami, K. Tamasaku, M. Yabashi, T. Ishikawa, A. V. Andreev, H. Wada, S. Imada, "Rare-earth Fourth Order Multipole Moment in Cubic ErCo2 Probed by Linear Dichroism in Core-Level Photoemission", J. Phys. Soc. Jpn. 87, 033710 (2018).
12. K. Yamagami, Y. Kanai, S. Naimen, H. Fujiwara, T. Kiss, A. Tanaka, A. Higashiya, S. Imada, T. Kadono, K. Tamasaku, T. Muro, M. Yabashi, T. Ishikawa, H. Eisaki, S. Miyasaka, S. Tajima, and A. Sekiyama, “Polarization-dependent X-ray photoemission spectroscopy for High-Tc cuprate superconductors”, Physica B: Condens. Matter 536, 843 (2018).
【2017年】
11. S. Hamamoto, S. Fujioka, Y. Kanai, K. Yamagami, Y. Nakatani, K. Nakagawa, H. Fujiwara, T. Kiss, A. Higashiya, A. Yamasaki, T. Kadono, S. Imada, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, K. T. Matsumoto, T. Onimaru, T. Takabatake, and A. Sekiyama, “Linear Dichroism in Angle-Resolved Core-Level Photoemission Spectra Reflecting 4f Ground-State Symmetry of Strongly Correlated Cubic Pr Compounds”, J. Phys. Soc. Jpn. 86, 123703 (2017).
10. M. Kouno, N. Yoshinari, N. Kuwamura, K. Yamagami, A. Sekiyama, M. Okumura and T. Konno, “Valence Interconversion of Octahedral Nickel(II/III/IV) Centers”, Angew. Chem. Int. Ed. 56, 13762 (2017).
9. K. Yamagami, H. Fujiwara, S. Imada, T. Kadono, K. Yamanaka, T. Muro, A. Tanaka, T. Itai, N. Yoshinari, T. Konno, and A. Sekiyama, “Local 3d Electronic Structures of Co-based Complexes with Medicinal Molecules Probed by Soft X-ray Absorption”, J. Phys. Soc. Jpn. 86, 074801 (2017).
8. Y. Kanai, T. Mori, S. Naimen, K. Yamagami, S. Kitayama, H. Fujiwara, A. Higashiya, T. Kadono, S. Imada, T. Kiss, A. Tanaka, T. Muro, K. Tamasaku, M. Yabashi, T. Ishikawa, F. Iga, T. Ebihara, F. Honda, Y. Onuki, and A. Sekiyama, “Linear dichroism in 3d core-level and 4f valence-band photoemission spectra of strongly correlated rare-earth compounds”, J. Electron Spectrosc. Relat. Phenom. 220, 61 (2017).
7. A. Higashiya, K. Nakagawa, A. Yamasaki, K. Nagai, S. Fujioka, Y. Kanai, K. Yamagami, H. Fujiwara, A. Sekiyama, A. Abozeed, T. Kadono, S. Imada, K. Kuga, M. Yabashi, K. Tamasaku, T. Ishikawa, S. Toyama, and K. Takase, “Hole doping effect on the electronic structure of layered oxypnictide LaOMnAs”, J. Electron Spectrosc. Relat. Phenom. 220, 58 (2017).
6. M. Yamada, N. Yoshinari, N. Kuwamura, T. Saito, S. Okada, S. P. Maddal, K. Harano, E. Nakamura, K. Yamagami, K. Yamanaka, A. Sekiyama, T. Suenobu, Y. Yamada and T. Konno, “Heterogeneous catalase-like activity of gold(I)-cobalt(III) metallosupramolecular ionic crystals”, Chem. Sci. 8, 2671 (2017).
【2016年】
5. A. Yamasaki, H. Fujiwara, S. Tachibana, D. Iwasaki, Y. Higashino, C. Yoshimi, K. Nakagawa, Y. Nakatani, K. Yamagami, H. Aratani, O. Kirilmaz, M. Sing, R. Claessen, H. Watanabe, T. Shirakawa, S. Yunoki, A. Naitoh, K. Takase, J. Matsuno, H. Takagi, A. Sekiyama, and Y. Saitoh, “Three-dimensional electronic structures and the metal insulator transition in Ruddlesden-Popper iridates”, Phys. Rev. B 94, 115103 (2016).
4. H. Fujiwara, S. Naimen, A. Higashiya, Y. Kanai, H. Yomosa, K. Yamagami, T. Kiss, T. Kadono, S. Imada, A. Yamasaki, K. Takase, S. Otsuka, T. Shimizu, S. Shingubara, S. Suga, M. Yabashi, K. Tamasaku, T. Ishikawa, and A. Sekiyama, “Polarized Hard X-ray Photoemission System with Micro-positioning Technique for Probing Ground State Symmetry of Strongly Correlated Materials”, J. Synchrotron Rad. 23, 735 (2016).
【2015年】
3. Y. Kanai, T. Mori, S. Naimen, K. Yamagami, H. Fujiwara, A. Higashiya, T. Kadono, S. Imada, T. Kiss, A. Tanaka, K. Tamasaku, M. Yabashi, T. Ishikawa, F. Iga, and A. Sekiyama, “Evidence for Γ8 Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission”, J. Phys. Soc. Jpn. 84, 073705 (2015).
【2014年】
2. T. Mori, S. Kitayama, Y. Kanai, S. Naimen, H. Fujiwara, A. Higashiya, K. Tamasaku, A. Tanaka, K. Terashima, S. Imada, A. Yasui, Y. Saitoh, K. Yamagami, K. Yano, T. Matsumoto, T. Kiss, M. Yabashi, T. Ishikawa, S. Suga, Y. Onuki, T. Ebihara, and A. Sekiyama, “Probing Strongly Correlated 4f-Orbital Symmetry of the Ground State in Yb Compounds by Linear Dichroism in Core-Level Photoemission”, J. Phys. Soc. Jpn. 83, 123702 (2014).
1. L-P Oloff, M. Oura, K. Rossnagel, A. Chainani, M. Matsunami, R. Eguchi, T. Kiss, Y. Nakatani, T. Yamaguchi, J. Miyawaki, M. Taguchi, K. Yamagami, T. Togashi, T. Katayama, K. Ogawa, M. Yabashi and T. Ishikawa, “Time-resolved HAXPES at SACLA: probe and pump pulse-induced space-charge effects”, New J. Phys. 16, 123045 (2014).