PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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Summary and Conclusions 110 Using high resolution photoelectron spectroscopy and O K edge x-ray absorption spectroscopy we have studied the temperature dependence of the near Fermi level electronic structure in the electron doped CMR, Ca 0.86 Pr 0.14 MnO 3 . We found that the temperature dependent changes in the electronic structure is consistent with the conductivity behavior of the electron doped systems in general. As the temperature is lowered from 293 K a feature due to the e g↑ states starts appearing near the E F . The intensity of this feature further increases below the T c with a shift of spectral weight from higher binding energy to the near E F states. Further, we have found an increase in the e g↑ band width (W) also at low temperatures. On the other hand, a complementary shifts of states from the near E F to higher energy positions were observed with decrease of temperature in the unoccupied states presented in the preedge region of O K edge x-ray absorption spectra. We have discussed our results from the point of view of phase separation models considering the temperature dependent structural changes and consequent localization of the electrons in a narrow e g band.
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SPECTROSCOPIC INVESTIGATIONS OF THE
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iii To My Parents
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Maharana, P. Khare, D. K. Basa, K.
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List of Publications/Preprints [1]
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Synopsis The perovskite type mangan
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to the t 2g and e g spin-up states
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Bibliography [1] R. von Helmolt, J.
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Contents CERTIFICATE Acknowledgemen
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List of Figures 1.1 Temperature dep
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2.2 Schematic view of the energetic
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3.4 O K edge x-ray absorption spect
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Chapter 1 Introduction 1
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Introduction 3 The temperature and
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Introduction 5 Figure 1.2: Schemati
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Introduction 7 Figure 1.4: A schema
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Introduction 9 Figure 1.6: Schemati
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Introduction 11 Figure 1.8: Differe
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Introduction 13 Figure 1.10: A sche
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Introduction 15 Figure 1.12: Schema
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Introduction 17 Figure 1.13: Phase
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Bibliography [1] R. von Helmolt, J.
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Introduction 21 [31] Damien Saurel,
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Chapter 2 Experimental Techniques 2
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Experimental Techniques 25 Figure 2
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Experimental Techniques 27 Let us n
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Experimental Techniques 29 and G(k,
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Experimental Techniques 33 point wi
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Experimental Techniques 35 negative
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Experimental Techniques 37 ∆E = E
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Experimental Techniques 41 ( ) dσ
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Experimental Techniques 43 The expe
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Experimental Techniques 45 are weld
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Bibliography [1] H. Hertz, Ann. Phy
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Experimental Techniques 57 [35] K.
Page 81 and 82: Chapter 3 Electronic Structure of P
Page 83 and 84: Electronic Structure of Pr 0.67 Ca
Page 95 and 96: Bibliography [1] I. G. Deac, J. F.
Page 99 and 100: Chapter 4 Electronic Structure of P
Page 101 and 102: Electronic Structure of Pr 1−x Ca
Page 119 and 120: Electronic Structure of Ca 0.86 Pr
Page 127 and 128: Bibliography [1] C. Zener, Phys. Re
Page 131: Summary and Conclusions 109 In this
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PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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