PHYS07200604007 Manas Kumar Dala - Homi Bhabha National ...

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[14] H. Kuwahara, Y. Tomioka, A. Asamitsu, Y. Moritomo, Y. Tokura; Science 270, 961 (1995). [15] T. Saitoh, A. E. Bocquet, T. Mizokawa, H. Namatame, A. Fujimori, M. Abbate, Y. Takeda, and M. Takano; Phys. Rev. B 51, 13942 (1995). [16] D. D. Sarma, N. Shanthi, S. R. Krishnakumar, T. Saitoh, T. Mizokawa, A. Sekiyama, K. Kobayashi, A. Fujimori, E. Weschke, R. Meier, G. Kaindl, Y. Takeda, and M. Takano; Phys. Rev. B 53, 6873 (1996). [17] J.-H. Park, C. T. Chen, S-W. Cheong, W. Bao, G. Meigs, V. Chakarian, and Y. U. Idzerda; Phys. Rev. Lett. 76, 4215 (1996). [18] A. Chainani, H. Kumigashira, T. Takahashi, Y. Tomioka, H. Kuwahara, and Y. Tokura; Phys. Rev. B 56, R15513 (1997). [19] C. Martin, A. Maignan, M. Hervieu, and B. Raveau, Phys. Rev. B 60 12191 (1999). xiv
Contents CERTIFICATE Acknowledgements List of Publications/Preprints Synopsis ii iv vii ix 1 Introduction 1 1.1 An overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 Colossal magnetoresistance . . . . . . . . . . . . . . . . . . . . . 3 1.3 Crystal structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4 The basic electronic structure . . . . . . . . . . . . . . . . . . . . 5 1.5 Double exchange mechanism . . . . . . . . . . . . . . . . . . . . 7 1.6 Jahn-Teller effect in CMR manganites . . . . . . . . . . . . . . 8 1.7 Phase separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.8 Spin, Charge and Orbital ordering in manganites . . . . . . . 11 1.9 Pseudogap behavior in manganites . . . . . . . . . . . . . . . . 13 1.10 Basic properties, phase diagram and CMR effect in Pr 1−x Ca x MnO 3 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2 Experimental Techniques 23 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.2 Photoemission Spectroscopy . . . . . . . . . . . . . . . . . . . . . 24 2.2.1 Basic principle . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.2.2 Theoretical interpretation of photoemission . . . . . . . . . . . 25 2.2.3 The electron escape depth . . . . . . . . . . . . . . . . . . . . 29 2.2.4 Experimental set-up . . . . . . . . . . . . . . . . . . . . . . . 30 xv
Page 1 and 2: SPECTROSCOPIC INVESTIGATIONS OF THE
Page 3 and 4: iii To My Parents
Page 5 and 6: Maharana, P. Khare, D. K. Basa, K.
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: Bibliography [1] R. von Helmolt, J.
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 55 and 56: Experimental Techniques 33 point wi
Page 57 and 58: Experimental Techniques 35 negative
Page 59 and 60: Experimental Techniques 37 ∆E = E
Page 63 and 64: Experimental Techniques 41 ( ) dσ
Page 65 and 66:
Experimental Techniques 43 The expe
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Experimental Techniques 45 are weld
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Experimental Techniques 47 Figure 2
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Bibliography [1] H. Hertz, Ann. Phy
Page 79 and 80:
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
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Bibliography [1] I. G. Deac, J. F.
Page 97 and 98:
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Chapter 4 Electronic Structure of P
Page 101 and 102:
Electronic Structure of Pr 1−x Ca
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Electronic Structure of Ca 0.86 Pr
Page 121 and 122:
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Page 127 and 128:
Bibliography [1] C. Zener, Phys. Re
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Summary and Conclusions 109 In this
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