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

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100 Chapter 7. Temperature and Co-Substitution Dependence of the ... of the spectral DOS, i.e., the k-integrated spectral function. 7.2 Experimental Figure 7.2: Electrical resistivities of FeCo1−xSix polycrystals [7.19]. The Fe1−xCoxSi alloys form a solid solution of the B20-type cubic structure in the whole concentration range. They become conductive as Co is substituted and gradually become metallic for x ≥ 0.05. They show weak ferromagnetism or helical spin order for 0.05
7.3. Results and Discussion 101 light source we used the He I resonance line (hν = 21.2 eV). The samples were repeatedly scraped in an ultra-high vacuum with a diamond file to obtain fresh surfaces. The base pressure of the spectrometer was in the 10−11 Torr range. The Fermi edge of Au film evaporated on the sample surface after each series of measurements was used to determine EF and the instrumental resolution. The resolution thus determined was ∼ 20 meV. 7.3 Results and Discussion Intensity FeSi 297 K 225 K 150 K 75 K 18 K Fe 0.95Co 0.05Si Fe 0.90Co 0.10Si 18 K 18 K hν = 21.2 eV -10 -8 -6 -4 -2 0 Energy relative to E F (eV) Figure 7.3: Entire valence-band photoemission spectra of Fe1−xCoxSi taken with hν = 21.2 eV. Figure 7.3 shows the entire valence band of Fe1−xCoxSi. As already reported [7.6, 7], the temperature dependence of the photoemission spectra of FeSi in such a wide energy scale is negligible. Also, Fig. 7.3 shows that the spectra do not change for
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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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48 Chapter 4. Evolution of Electron
Page 54 and 55: 50 Chapter 4. Evolution of Electron
Page 63 and 64: References [4.1] G. Aeppli and Z. F
Page 65: References 61 [4.25] P. Weibel,M. G
Page 68 and 69: 64 Chapter 5. Temperature Dependenc
Page 78 and 79: 74 References [5.10] N. Shimizu, F.
Page 81 and 82: Chapter 6 Substitution and Temperat
Page 83 and 84: 6.1. Introduction 79 Figure 6.2: Ma
Page 85 and 86: 6.3. Results and Discussion 81 6.3
Page 87 and 88: 6.3. Results and Discussion 83 DOS
Page 89 and 90: 6.3. Results and Discussion 85 dist
Page 91 and 92: 6.3. Results and Discussion 87 Apar
Page 93 and 94: 6.3. Results and Discussion 89 of E
Page 95 and 96: 6.3. Results and Discussion 91 the
Page 97: 6.4. Summary 93 and consistent anal
Page 100 and 101: 96 References [6.11] M. J. Rozenber
Page 102 and 103: 98 Chapter 7. Temperature and Co-Su
Page 106 and 107: 102 Chapter 7. Temperature and Co-S
Page 113 and 114: References [7.1] G. Aeppli and Z. F
Page 115 and 116: Chapter 8 Temperature and Al-Substi
Page 117 and 118: 8.2. Experimental 113 and Fisk [8.2
Page 119 and 120: 8.3. Results and Discussion 115 8.3
Page 121 and 122: 8.3. Results and Discussion 117 Int
Page 123 and 124: 8.3. Results and Discussion 119 dep
Page 125 and 126: 8.3. Results and Discussion 121 σ
Page 127: 8.4. Summary 123 temperature magnet
Page 130 and 131: 126 References [8.14] T. Tonogai, A
Page 132 and 133: 128 Chapter 9. Conclusion has shown
Page 134 and 135: 130 Chapter 9. Conclusion (a) FeSi
Page 136: 132 Chapter 9. Conclusion developed
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