PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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I am extremely grateful to Mrs. Ranjana Sekhar for making my stay homely during the course of my work. Gratefully I would like to thank my younger sister Tuin and younger brother Tulia for their unlimited love, affection, encouragements, assistance and support at every stage of my life. I do not find proper words to express my sense of indebtedness to my wife Manasmita, whose unlimited love, affection, encouragements, and support have become a special inspiration to me during my Ph. D life. I also thank my brother in-law Munu for his love, affection and support. Finally, I wish to express my deep sense of gratitude to my parents and late grand parents for their immense patience, love, affection, encouragements and support. I am indebted to them for giving me the freedom to choose my career and for constantly providing me the moral and emotional support at every stage of my life. It is only because of their kind blessings that I could complete this work. Date: 22.05.2009 (Manas Kumar Dalai) vi
List of Publications/Preprints [1] Valence band electronic structure of Pr 1−x Sr x MnO 3 from photoemission studies, P. Pal, M. K. Dalai, B. R. Sekhar, S. N. Jha, S. V. N. Bhaskara Rao, N. C. Das, C. Martin, and F. Studer; J. Phys. : Condens. Matter 17, 2993 (2005). *[2] Electronic structure of Pr 0.67 Ca 0.33 MnO 3 near the Fermi level studied by ultraviolet photoelectron and x-ray absorption spectroscopy, M. K. Dalai, P. Pal, B. R. Sekhar, N. L. Saini, R. K. Singhal, K. B. Garg, B. Doyle, S. Nannarone, C. Martin, and F. Studer; Phys. Rev. B 74, 165119 (2006). [3] Near Fermi level electronic structure of Pr 1−x Sr x MnO 3 : Photoemission study, P. Pal, M. K. Dalai, R. Kundu, M. Chakraborty, B. R. Sekhar, and C. Martin; Phys. Rev. B 76, 195120 (2007). [4] Pseudogap behavior of phase-separated Sm 1−x Ca x MnO 3 : A comparative photoemission study with double exchange, P. Pal, M. K. Dalai, R. Kundu, B. R. Sekhar, and C. Martin; Phys. Rev. B 77, 184405 (2008). *[5] Electronic structure of Pr 1−x Ca x MnO 3 from photoemission and inverse photoemission spectroscopy, M. K. Dalai, P. Pal, R. Kundu, B. R. Sekhar, S. Banik, A. K. Shukla, S. R. Barman, and C. Martin; Submitted to Physica B. *[6] Spectroscopic investigations of the electron-doped Ca 0.86 Pr 0.14 MnO 3 , M. K. Dalai, P. Pal, R. Kundu, B. R. Sekhar, M. Mertz, P. Nagel, S. Schuppler, and C. Martin; Submitted to Phys. Rev. B. *[7] Core level electronic structure of Pr 1−x Ca x MnO 3 using x-ray photoelextron spectroscopy, M. K. Dalai, P. Pal, R. Kundu, B. R. Sekhar, and C. Martin; To be submitted. vii
Page 1 and 2: SPECTROSCOPIC INVESTIGATIONS OF THE
Page 3 and 4: iii To My Parents
Page 5: Maharana, P. Khare, D. K. Basa, K.
Page 9 and 10: Synopsis The perovskite type mangan
Page 11 and 12: to the t 2g and e g spin-up states
Page 13 and 14: Bibliography [1] R. von Helmolt, J.
Page 15 and 16: Contents CERTIFICATE Acknowledgemen
Page 17 and 18: List of Figures 1.1 Temperature dep
Page 19 and 20: 2.2 Schematic view of the energetic
Page 21 and 22: 3.4 O K edge x-ray absorption spect
Page 23 and 24: Chapter 1 Introduction 1
Page 25 and 26: Introduction 3 The temperature and
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Page 37 and 38: Introduction 15 Figure 1.12: Schema
Page 39 and 40: Introduction 17 Figure 1.13: Phase
Page 41 and 42: Bibliography [1] R. von Helmolt, J.
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Experimental Techniques 35 negative
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Experimental Techniques 37 ∆E = E
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Experimental Techniques 39 Figure 2
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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.
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Chapter 3 Electronic Structure of P
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Electronic Structure of Pr 0.67 Ca
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Bibliography [1] I. G. Deac, J. F.
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Chapter 4 Electronic Structure of P
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Electronic Structure of Pr 1−x Ca
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Electronic Structure of Ca 0.86 Pr
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Bibliography [1] C. Zener, Phys. Re
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Summary and Conclusions 109 In this
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