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

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28 Chapter 2. Photoemission Spectroscopy a rather high value for the Gammadata lamp (He I α : He I β : He II = 82 : 8 : 10) compared with the VG lamp, of which the ratio is tunable. In the He I spectra of Yb1−xLuxB12, the intensity of the intrinsic signal and the background at EF are almost the same as shown in Fig. 2.6. In Chaps 5 and 7 we have subtracted a linear background before dividing the spectra by the FD function. Especially, to discuss a small change in the spectral DOS with substitution or temperature, we have subtracted the background signals systematically as follows in Chaps 6 and 8: We have assumed that the background is linear in the narrow energy region of our interest. We fitted the signals above EF in the spectra taken at 7 K to a line and subtracted that line from the raw spectra as shown in Fig. 2.6. Then we fitted the signals in the higher-temperature spectra by adjusting the intensity of the linear background at 7 K with its relative slope fixed. Although the He I spectra in Chap. 8 have been taken with the VG lamp and the satellite lines have been tuned to be much less than those with the Gammadata lamp, we have followed the above procedure to deal with the effect of a small substitution.
References [2.1] O. Gunnarsson and K. Schönhammer, in Handbook on the Physics and Chemistry of Rare Earths, edited by K. A. Gschneidner, Jr., L. Eyring, and S. Hüfner (Elsevier Science Publishers, 1987), p.110. [2.2] S. Hüfner, in Photoemission Spectroscopy, edited by M. Cardona et al. (Springer- Verlag, 1995), p. 20. [2.3] M. Cardona and L. Ley, in Photoemission in Solids I, edited by M. Cardona and L. Ley (Springer-Verlag, 1978), p. 52. [2.4] M. Randeria, H. Ding, J.-C. Campuzano, A. Bellman, G. Jennings, T. Yokoya, T. Takahashi, H. Katayama-Yoshida, T. Mochiku, and K. Kadowaki, Phys. Rev. Lett. 74, 4951 (1995). [2.5] S. Shin, S. Suga, M. Taniguchi, M. Fujisawa, H. Kanzaki, A. Fujimori, H. Daimon, Y. Ueda, K. Kosuge, and S. Kachi, Phys. Rev. B 41, 4993 (1990). [2.6] T. Greber, T. J. Kreutz, and J. Osterwalder, Phys. Rev. Lett. 79, 4465 (1997). [2.7] A. Yanase and H. Harima, Prog. Theor. Phys. Suppl. 108, 19 (1992) and unpublished results (partial DOS). [2.8] M. R. Norman, H. Ding, M. Randeria, J. C. Campuzano, T. Yokoya, T. Takeuchi, T. Takahashi, T. Mochiku, K. Kadowaki, P. Guptasarma, and D. G. Hinks, Nature 392, 157 (1998). [2.9] A. Sekiyama, Thesis, University of Tokyo, 1997. [2.10] VG Microtech, 1996. 29
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Page 4 and 5: ii CONTENTS 5.2 Experimental . . .
Page 6 and 7: 2 Chapter 1. Introduction Figure 1.
Page 8 and 9: 4 Chapter 1. Introduction Figure 1.
Page 10 and 11: 6 Chapter 1. Introduction peaks, wh
Page 12 and 13: 8 Chapter 1. Introduction only the
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Page 16 and 17: 12 Chapter 1. Introduction activati
Page 18 and 19: 14 References [1.14] F. Iga, M. Kas
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Page 23 and 24: 2.1. General Principles 19 Photoele
Page 25 and 26: 2.1. General Principles 21 where R(
Page 27 and 28: 2.2. Experimental 23 DOS Intensity
Page 29 and 30: 2.2. Experimental 25 Figure 2.5: Il
Page 31: 2.2. Experimental 27 baking out the
Page 36 and 37: 32 Chapter 3. Photoemission Study o
Page 48 and 49: 44 References the Kondo peak positi
Page 50 and 51: 46 Chapter 4. Evolution of Electron
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Page 65: References 61 [4.25] P. Weibel,M. G
Page 68 and 69: 64 Chapter 5. Temperature Dependenc
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6.1. Introduction 79 Figure 6.2: Ma
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6.3. Results and Discussion 81 6.3
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6.3. Results and Discussion 83 DOS
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6.3. Results and Discussion 85 dist
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6.3. Results and Discussion 87 Apar
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6.3. Results and Discussion 89 of E
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6.3. Results and Discussion 91 the
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6.4. Summary 93 and consistent anal
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96 References [6.11] M. J. Rozenber
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98 Chapter 7. Temperature and Co-Su
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100 Chapter 7. Temperature and Co-S
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References [7.1] G. Aeppli and Z. F
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Chapter 8 Temperature and Al-Substi
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8.2. Experimental 113 and Fisk [8.2
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8.3. Results and Discussion 115 8.3
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8.3. Results and Discussion 117 Int
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8.3. Results and Discussion 119 dep
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8.3. Results and Discussion 121 σ
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8.4. Summary 123 temperature magnet
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126 References [8.14] T. Tonogai, A
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128 Chapter 9. Conclusion has shown
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130 Chapter 9. Conclusion (a) FeSi
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132 Chapter 9. Conclusion developed
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