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

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110 References [7.12] H. Ohta, S. Kimura, E. Kulatov, S. V. Halilov, T. Nanba, M. Motokawa, M. Sato, and K. Nagasaka, J. Phys. Soc. Jpn. 63, 4206 (1994). [7.13] A. Damascelli, K. Schulte, D. van der Marel, and A. A. Menovsky, Phys. Rev. B 55, R4863 (1997). [7.14] P. Nyhus, S. L. Cooper, and Z. Fisk, Phys. Rev. B 51, 15626 (1995). [7.15] L. F. Mattheiss and D. R. Hamann, Phys. Rev. B 47, 13114 (1993). [7.16] C. Fu, M. P. C. M. Krijin, and S. Doniach, Phys. Rev. B 49, 2219 (1994). [7.17] H. Watanabe, H. Yamamoto, and K. Ito, J. Phys. Soc. Jpn. 18, 995 (1963). [7.18] J. Beille, D. Bloch, V. Jaccarino, J. H. Wernick, and G. K. Wertheim, J. Phys. (Paris) 38, 339 (1977). [7.19] A. Ohno, T. Tonogai, and H. Takagi, unpublished. [7.20] T. Greber, T. J. Kreutz, and J. Osterwalder, Phys. Rev. Lett. 79, 4465 (1997). [7.21] M. A. Chernikov, L. Degiorgi, E. Felder, S. Paschen, A. D. Bianchi, H. R. Ott, J. L. Sarrao, Z. Fisk, and D. Mandrus, Phys. Rev. B 56, 1366 (1997). [7.22] J. J. Yeh and I. Lindau, At. Data Nucl. Data Tables 32, 1 (1985). [7.23] J. Y. Son, A. Fujimori, and T. Kanomata, unpublished.
Chapter 8 Temperature and Al-Substitution Dependence of the Photoemission Spectra of FeSi We have performed temperature-dependent high-resolution photoemission measurements on FeSi1−xAlx (x = 0.00, 0.02, 0.05, 0.10, and 0.30) and have identified three different energy regions near the Fermi level (EF ) from the different responses of the spectral density of states (DOS) to temperature and Al substitution. That is, the dip in the vicinity (∼ 20 meV) of EF which is sensitive to a small amount of Al substitution and a small temperature increase, the pseudogap region (∼ 50 meV) whose depth smoothly depends on Al substitution and temperature, and the shoulder near the valence-band top (∼ 100 meV), which grows with decreasing Al concentration in going from x = 0.30 to 0.00. The broad peak at ∼ 400 meV below EF is stable against both temperature and substitution unlike that in Fe1−xCoxSi, where the peak position moved for a small amount of Co substitution. 8.1 Introduction In the preceding photoemission study of FeSi, we have found that Co substitution recovers the density of states (DOS) in the vicinity of the Fermi level (EF ) and does not modify the size of the pseudogap of ∼ 50 meV. The broad peak at ∼−0.3 eV also depends on the substitution and is shifted to higher binding energies with Co substitution. However, although Co substitution increases the band filling in FeSi, it 111
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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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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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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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