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 <strong>Manas</strong>mita, 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 (<strong>Manas</strong> <strong>Kumar</strong> <strong>Dala</strong>i) 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, 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. <strong>Dala</strong>i, P. Pal, R. Kundu, B. R. Sekhar, and C. Martin; To be submitted. vii
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Bibliography [1] H. Hertz, Ann. Phy
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Bibliography [1] I. G. Deac, J. F.
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Bibliography [1] C. Zener, Phys. Re
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Summary and Conclusions 109 In this