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

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84 Chapter 6. Substitution and Temperature Dependence of the Conduction ... Intensity (arb. units) Intensity (arb. units) Yb 1-xLu xB 12 single crystals 7 K Yb 1-xLu xB 12 polycrystals 30 K x = 0.00 x = 0.25 x = 0.50 x = 0.75 x = 1.00 x = 0.00 x = 0.50 x = 1.00 -40 -20 0 20 Energy relative to E F (meV) Figure 6.5: Photoemission spectra of Yb1−xLuxB12 taken at 7 K on an enlarged energy scale (upper panel). The spectra of polycrystals taken at ∼ 30 K with energy resolution of 21-25 meV is also shown in the lower panel. Normalization of the spectra is the same as in Fig. 6.3
6.3. Results and Discussion 85 distribution function. Thus we again divided the spectra by the FD function (convoluted with a Gaussian corresponding to the energy resolution) as shown in the lower panel of the figure. The spectral DOS thus obtained is found to increase with increasing temperature in a rather wide energy region between EF and ∼−100 meV. Intensity DOS LuB 12 hν = 21.2 eV 300 K 225 K 150 K 75 K 7 K 300 K 225 K 150 K 75 K 7 K LuB 12 -150 -100 -50 0 50 100 Energy relative to E F (meV) Figure 6.6: Temperature-dependent He I photoemission spectra of LuB12 (upper panel) and those divided by the FD function convoluted with the instrumental resolution (lower panel). We note again that the intensity at EF in the spectra divided by the convoluted FD function does not depend on uncertainties in the temperature nor the Gaussian width, because the FD function is 0.5 at EF at any temperature even if that FD function is convoluted with any Gaussian. However, an error in the temperature or the Gaussian width might cause a spurious temperature dependence near EF in the FDfunction-divided spectra. The fact that temperature dependence is more remarkable
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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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Page 48 and 49: 44 References the Kondo peak positi
Page 50 and 51: 46 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: 6.3. Results and Discussion 83 DOS
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 104 and 105: 100 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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