PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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Acknowledgements I owe a debt of gratitude to many people who made this thesis possible due to their support, suggestions, and encouragements. First of all, it is a great pleasure for me to express my sincere gratitude and indebtedness to my thesis supervisor Prof. B. R. Sekhar for his invaluable guidance and constant encouragement to complete this work. His excellent training in handling the intricacies of various experiments and making me acquainted with the data analysis have been an inspiration for me to pursue my career as an experimental condensed matter physicist. I wish to thank him for giving me the complete freedom both academically and socially during the period of my work. I would like to thank my group members Prabir and Rupali for their untiring support during the experiments and for many interesting discussions. I would also like to thank our technical staff Mr. Chittaranjan Swain for his help during the experiments. My sincere thanks go to Prof. C. Martin (Laboratoire CRISMAT, France) for providing good quality samples for this thesis work. I would like to thank Dr. S. R. Barman, Dr. S. Banik, Dr. A. K. Shukla and Dr. R. Dhaka (UGC-DAE CSR, Indore) for their help and discussions for inverse photoemission measurements. I would also like to thank Prof. Stefan Schuppler, Dr. Peter Nagel and Dr. Michael Merz for their help and cooperation during the high resolution photoemission and x-ray absorption measurements at WERA beamline of ANKA synchrotron, Karlsruhe, Germany. I would like to thank Dr. Federica Bondino, Dr. Marco Zangrando, Dr. Elena Magnano and Dr. Bryan Doyle of ELETTRA synchrotron, Trieste for their help and technical discussions for XAS experiments. It is a great pleasure for me to thank Prof. N. L. Saini (Departimento di fisica, Universita di Roma, Rome, Italy) for his fruitfull discussion at different stages of my Ph. D. career. I also thank Prof. Anil Kumar and Prof K. K. Nanda of IISc Bangalore for discussion and suggestions during their short visit to IOP. I would like to thank all my teachers, who had taught me at various stages of my educational career, especially my M. Sc teachers Profs. N. Barik, L. P. Singh, L. iv
Maharana, P. Khare, D. K. Basa, K. Maharana, S. Mohapatra and D. Behera and B. Sc teacher Mr. Dipak Singh for their encouragement and excellent teaching. It is my great pleasure to thank Profs. A. Khare, A. M. Jayannavar, S. G. Mishra, D. P. Mohapatra, K. Kundu, P. V. Satyam, S. Varma, S. Mukherji, J. Maharana, G. V. Raviprasad, A. M. Srivastava, S. M. Bhattacharjee, A. Kumar, P. Agrawal, T. Som, G. Tripathy, S. K. Patra for their teaching, suggestions and encouragements. I thank our director Dr. Y. P. Viyogi and ex-director Dr. R. K. Choudhury for their support and encouragements in all respect. I would like to thank Mr. Santosh Choudhury, Mr. Anup Behera, Mrs. Ramarani Das, Mr. Arun Dash, Mr. Khirod Patra, and Dr. S. N. Sarangi for providing technical help when needed. I would also like to thank the library staff Rama, Rabaneswar, Duryodhan and Kissan for their cooperation at every stage. I thank Dipankar, Srijesh and Dhiren for their help and cooperation at every computer related problems. I wish to thank the hostel mess staff for their wonderful services. I am thankful to our registrar Mr. C. B. Mishra for his imense help and cooperation in all administrative problems. I also thank Mr. Sk. Kefaytulla and Rajesh Mohapatra for their administrative help. I take this oppurtunity to thank my M.Sc friends Rajesh, Tapas, Swayambhu, Hitu and Manmohan and village friend Suda for their constant support and encouragement in all stage of my life. A special thank to Ananta for his constructive criticism, support and company for both academic and social activities in my Ph.D life. It is my pleasure to thank Zashmir bhai, Satya bhai, Jhasa bhai, Satchi bhai, Bedanga bhai, Pal bhai, Kamal bhai, Pradeep bhai, Bishnu bhai, Birendra bhai, Sudhira bhauja and Raj babu for their encouragement and cooperation during my stay at IOP. I would like to thank Millind, Sinu, Boby, Chandra, Hara, Amulya, Ajay, Trilochan, Smruti, Chitrasen, Jatis, Ashutosh, Kuntala, Sadhana, Mamata, Ranjita, Binata, Jaya, Poulomi, Saumia, Pramita, Probodh, Jay, Dipak, Sumalay, Bharat, Anupam, Umanand, Dilip, Suchi, Srikumar, Sankha, Nabyendu, Somnath, Sandeep, Sourabh, Subrat, Sanjay, Raghavendra, Vanaraj, and Tanmoy for making my stay at the Institute a memorable one. I also thank Dr. V. R. R. Medicherla for his valuable discussions. I would like to give my special thanks to Dr. Arun Kumar Pati and Dr. Biswajit Pradhan for making my stay in the beautiful campus of IOP an exciting, memorable and pleasing one. v
Page 1 and 2: SPECTROSCOPIC INVESTIGATIONS OF THE
Page 3: iii To My Parents
Page 7 and 8: List of Publications/Preprints [1]
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
Page 27 and 28: Introduction 5 Figure 1.2: Schemati
Page 29 and 30: Introduction 7 Figure 1.4: A schema
Page 31 and 32: Introduction 9 Figure 1.6: Schemati
Page 33 and 34: Introduction 11 Figure 1.8: Differe
Page 35 and 36: Introduction 13 Figure 1.10: A sche
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.
Page 43 and 44: Introduction 21 [31] Damien Saurel,
Page 45 and 46: Chapter 2 Experimental Techniques 2
Page 47 and 48: Experimental Techniques 25 Figure 2
Page 49 and 50: Experimental Techniques 27 Let us n
Page 51 and 52: Experimental Techniques 29 and G(k,
Page 53 and 54: Experimental Techniques 31 Figure 2
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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 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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