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

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82 Chapter 6. Substitution and Temperature Dependence of the Conduction ... Intensity (arb. units) hν = 21.2 eV Yb 1-x Lu x B 12 0.00 - 1.00 0.25 - 1.00 0.50 - 1.00 0.75 - 1.00 x = 0.00 x = 0.25 x = 0.50 x = 0.75 x = 1.00 7 K difference ( ×5 ) -200 -100 0 100 Energy relative to E F (meV) Figure 6.3: Upper panel: Photoemission spectra of Yb1−xLuxB12 at 7 K. Lower panel: Difference between the spectra of Yb1−xLuxB12 and that of LuB12. They have been smoothed since the statistical noise of the raw difference spectra was rather high.
6.3. Results and Discussion 83 DOS (states/eV) 6 5 4 3 2 1 YbB 12 Yb f (× 1/20) B p LuB 12 B p (shifted) 0 -1.5 -1.0 -0.5 0 0.5 Energy relative to EF (eV) Figure 6.4: Calculated Yb f and B p partial DOS of YbB12 [6.8] and B partial DOS of LuB12 [6.9], where the f structure are located ∼ 4 eV below EF . We have shifted 0.57 eV the B p partial DOS of LuB12 to show the effect of the Yb f -Bp hybridization on the B p DOS. instrumental resolution. Also, as already mentioned for Fig. 5.1 and Fig. 5.2, the sample quality was improved in the single crystals. It is common to the poly- and single- crystal spectra that with Lu substitution the spectral weight between EF and 20 meV below it increases while that below ∼ 30 meV decreases corresponding to the decrease in the intensity of the − 80 meV peak. 6.3.2 Conduction Band in LuB12 Here we discuss the conduction band in the reference compound LuB12 and its temperature dependence. The upper panel of Fig. 6.6 shows temperature-dependent He I spectra of LuB12. The spectra have been normalized to the integrated intensity below − 200 meV as done for the spectra of YbB12 in Chap. 5. The increase in the spectral weight above EF in going 7 K to 300 K is obviously larger than the decrease below EF , indicating a temperature dependence other than the effect of the Fermi-Dirac (FD)
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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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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.
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Page 83 and 84: 6.1. Introduction 79 Figure 6.2: Ma
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Page 100 and 101: 96 References [6.11] M. J. Rozenber
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Page 104 and 105: 100 Chapter 7. Temperature and Co-S
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Page 115 and 116: Chapter 8 Temperature and Al-Substi
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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
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132 Chapter 9. Conclusion developed
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