Thesis High-Resolution Photoemission Study of Kondo Insulators ...

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130 Chapter 9. Conclusion (a) FeSi (7 K) (b) - 5 eV FeSi Al (7 K) 1-x x - 300 meV (c) FeSi - 50 meV FeSi Al 1-x x - 50 meV ~ 8 k T B max E F E F E F FeSi Al (7 K) 1-x x FeSi (7 K) E F 295 K 7 K 295 K 7 K Figure 9.2: Schematic summary of the photoemission spectra of FeSi1−xAlx, which was studied in the wide x range compared with Fe1−xCoxSi: The entire valence band which has a broad peak (a), the substitution dependence near EF (b), and the temperature dependence of the pseudogap around EF (c).
Acknowledgments The present Thesis is a fruitful result of the continuous collaboration with the supervisor A. Fujimori and the following excellent co-workers. Long-years discussion with the supervisor A. Fujimori, who has read the Thesis carefully and has given numerous valuable comments, is the backbone of this Thesis. T. Mizokawa and K. Kobayashi have instructed the author the photoemission spectroscopy and have given him continuous advice since he started the present work. He thanks the colleagues in the laboratory: J.-Y. Son, J. Okamoto, J. Matsuno, J. Okabayashi, T. Yoshida, Y. Ishikawa, K. Okazaki, H. Ishii, T. Nambu, N. Harima, H. Wakazono, A. Ino, M. Satake, O. Rader, T. Tsujioka, A. E. Bocquet, T. Saitoh, and K. Morikawa. The Yb1−xLuxB12 polycrystals were grown by F. Iga and M. Kasaya at Tohoku University. The Yb1−xLuxB12 single crystals were grown by N. Shimizu, S. Hiura, F. Iga, and T. Takabatake at Hiroshima University. Correspondence with F. Iga has often been crucial to proceed the present study. Fe1−xCoxSi and FeSi1−xAlx polycrystals were developed by A. Ohno, T. Tonogai, and H. Takagi at University of Tokyo. The photoemission set up at the Photon Factory, which was used in the study of Chapters 3, 4, and 5, was constructed by S. Suga, A. Kimura, T. Matsushita, M. Tsunekawa (Osaka University), A. Sekiyama (University of Tokyo), H. Namatame (Hiroshima University), H. Ishii, T. Miyahara, and T. Hanyu (Tokyo Metropolitan University). On measurement, the above members and T. Muro, S. Ueda, T. Iwasaki, S. Imada (Osaka University), K. Mamiya (Hiroshima University), E. Shigemasa, A. Kakizaki, K. V. Kaznacheyev (Photon Factory), J. Matsuno, T. Konishi, T. Yoshida (University of Tokyo), and M. Nakamura (Nara University of Education) supported the author. The high-resolution measurements (Chapters 5 and 6) were performed at Hiroshima University, using the set up improved by Y. Takeda, M. Arita, K. Shimada, H. Namatame, and M. Taniguchi. Highest-level photoemission measurements and stimulating discussion day after day at Hiroshima University, which leads in the physics of Kondo insulators, were the highlights of the present research. The set up for the measurements in Chapters 3, 4, 7, and 8 was constructed and has been improved at University of Tokyo by M. Nakamura, A. Sekiyama, and K. Kobayashi. The newly 131
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Thesis High-Resolution Photoemissio
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ii CONTENTS 5.2 Experimental . . .
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2 Chapter 1. Introduction Figure 1.
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4 Chapter 1. Introduction Figure 1.
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6 Chapter 1. Introduction peaks, wh
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8 Chapter 1. Introduction only the
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10 Chapter 1. Introduction directio
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12 Chapter 1. Introduction activati
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14 References [1.14] F. Iga, M. Kas
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Chapter 2 Photoemission Spectroscop
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2.1. General Principles 19 Photoele
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2.1. General Principles 21 where R(
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2.2. Experimental 23 DOS Intensity
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2.2. Experimental 25 Figure 2.5: Il
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2.2. Experimental 27 baking out the
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References [2.1] O. Gunnarsson and
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32 Chapter 3. Photoemission Study o
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44 References the Kondo peak positi
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46 Chapter 4. Evolution of Electron
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References [4.1] G. Aeppli and Z. F
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References 61 [4.25] P. Weibel,M. G
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64 Chapter 5. Temperature Dependenc
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74 References [5.10] N. Shimizu, F.
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Chapter 6 Substitution and Temperat
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