Valence, orbital, and spin states of cobaltates: a soft X-ray absorption study
Gespeichert in:
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
2011
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zsfassung in dt. und engl. Sprache |
| Beschreibung: | 159 S. graph. Darst. |
Internformat
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| 245 | 1 | 0 | |a Valence, orbital, and spin states of cobaltates |b a soft X-ray absorption study |c vorgelegt von Yi-Ying Chin |
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Datensatz im Suchindex
| _version_ | 1804149696581599232 |
|---|---|
| adam_text | Titel: Valence, orbital, and spin states of cobaltates
Autor: Chin, Yi-Ying
Jahr: 2011
Contents
1 Introduction 7
1.1 Charge degree of freedom...................... 8
1.1.1 Mott-Hubbard insulators and the Hubbard model .... 8
1.1.2 Charge-transfer insulator and ZSA scheme........ 9
1.1.3 Negative charge transfer energy.............. 10
1.2 Orbital degree of freedom ..................... 12
1.3 Exchange interactions........................ 13
1.4 Spin state degree of freedom.................... 14
1.4.1 Possible spin states of Co3+and Co4+........... 15
1.4.2 Properties associated with the spin state degree of freedom 18
1.5 Scope ................................ 20
2 Experiment methods: XAS, XPS 23
2.1 Synchrotron radiation ....................... 23
2.2 X-ray absorption spectroscopy (XAS)............... 24
2.2.1 Introduction......................... 26
2.2.2 Experimental aspects.................... 26
2.2.3 Multiplet effects....................... 28
2.2.4 Element, valence, spin and orbital sensitivities of XAS . 28
2.2.5 Linear dichroism (LD)................... 30
2.2.6 X-ray magnetic circular dichroism (XMCD) and sum rules 31
2.3 X-ray Photoemission spectroscopy................. 33
2.3.1 Chemical shift and Satellites................ 34
3 Multiplet theory and ligand field theory 36
3.1 Multiplet effects........................... 37
3.1.1 Atomic Multiplet Theory.................. 37
3.1.2 Difference between the L3 and the L2 edges ....... 39
3.2 Ligand field theory......................... 40
3.2.1 Crystal field theory..................... 40
3.2.2 Hybridization........................ 43
3.3 Examples .............................. 44
3.3.1 The effect of 2p spin-orbit coupling and crystal field split-
ting lODq.......................... 44
3.3.2 The effect of d spin-orbit coupling and intra-atomic Coulomb
interaction.......................... 45
3.3.3 Charge transfer effects................... 49
4 The spin state issue of Srn.7Y0.3CoO2.63 53
4.1 Introduction............................. 53
4.2 Experimental............................ 54
4.3 O-K XAS spectra of Sro.7Yo.3CoO2.e3............... 55
4.4 Cc-Z/2,3 XAS spectra of Sro.7Yo.3CoO2.63.............. 56
4.5 Theoretical simulations of the Co-L2,3 XAS spectra of Sro.7Yo.3CoO2.03 56
4.6 Conclusions............................. 59
5 The valence and spin states of Co ions in SrCoo.5Ruo.5O3 60
5.1 Introduction............................. 60
5.2 Experimental............................ 61
5.3 Valence of Ru............................ 61
5.4 Valence and spin state of Co.................... 63
5.5 Spin state transition of Co under pressure ............ 65
5.6 Spin-glass-like behavior....................... 68
5.7 Conclusions............................. 68
6 The local electronic structure of BaCo03 69
6.1 Introduction............................. 69
6.2 Experimental............................ 71
6.3 Valence and spin state of Co in BaCoOs............. 71
6.4 Orbital occupation of Co in BaCo03 ............... 77
6.5 The semiconducting behavior of BaCo03............. 78
6.6 Conclusions............................. 79
7 The spin state of Co ions in Sr2Co04 80
7.1 Introduction............................. 80
7.2 Experimental............................ 81
7.3 Valence and spin state of Co in Sr2Co04............. 82
7.4 The mechanism to stabilize the IS state in Sr2Co04....... 85
7.5 The different transport properties displayed by Sr2Co04 and
BaCo03............................... 87
7.6 Conclusions............................. 88
8 Local orbital occupation, spin state, and energy levels of the
Co ions in NaxCo02 89
8.1 Introduction............................. 89
8.2 Experimental............................ 91
8.3 Simulation of NaxCo02 using the experimental Co3+ and Co4+
spectra................................ 93
8.4 Theoretical simulation of the polarization dependence in the XAS
spectra of Na:rCo02......................... 94
8.5 The incoherent weight sum..................... 96
8.6 Possibility of the IS ground state of Co3+ ions in Naa:Co02 • • • 99
8.7 3d orbitals in D3ci local symmetry................. 102
8.8 The origin of the linear dichroism at the Co-Z/2,3 edges ..... 103
8.9 The trigonal crystal field splitting and the orbital occupations of
the Co ions............................. 107
8.10 Conclusions............................. 109
9 Determination of the valence state of Co in Superconducting
NaICo02.yH20 110
9.1 Introduction............................. 110
9.2 Experimental............................ 113
9.3 Valence state of Co extracted from Cc~L2i3 XAS spectra .... 113
9.4 Valence state of Co determined by the O-K XAS spectra .... 116
9.5 Possible mechanism for the presence of the superconducting be-
havior ................................ 117
9.6 Conclusions............................. 118
10 Determination of orbital ordering pattern and Jahn-Teller dis-
tortion in orthorhombic DyMnOs 119
10.1 Introduction............................. 119
10.2 Experimental............................ 120
10.3 Linear dichroism at the Mn-L2,3 edges .............. 121
10.4 The Jahn-Teller distortion and the energy levels of Mn in DyMnOs 123
10.5 The orbital occupation numbers of the Mn3+ ions in DyMnOa . 126
10.6 Conclusions............................. 127
Abstract 128
Kurzzusammenfassung 131
Reference 133
Publications 155
Acknowledgements 157
Erklarung 159
Lebenslauf 160
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| any_adam_object | 1 |
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| author_GND | (DE-588)1024681645 |
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| dewey-tens | 530 - Physics |
| discipline | Physik |
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| spelling | Chin, Yi-Ying 1980- Verfasser (DE-588)1024681645 aut Valence, orbital, and spin states of cobaltates a soft X-ray absorption study vorgelegt von Yi-Ying Chin 2011 159 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Zsfassung in dt. und engl. Sprache Köln, Univ., Diss., 2012 (DE-588)4113937-9 Hochschulschrift gnd-content HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025432680&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Chin, Yi-Ying 1980- Valence, orbital, and spin states of cobaltates a soft X-ray absorption study |
| subject_GND | (DE-588)4113937-9 |
| title | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study |
| title_auth | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study |
| title_exact_search | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study |
| title_full | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study vorgelegt von Yi-Ying Chin |
| title_fullStr | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study vorgelegt von Yi-Ying Chin |
| title_full_unstemmed | Valence, orbital, and spin states of cobaltates a soft X-ray absorption study vorgelegt von Yi-Ying Chin |
| title_short | Valence, orbital, and spin states of cobaltates |
| title_sort | valence orbital and spin states of cobaltates a soft x ray absorption study |
| title_sub | a soft X-ray absorption study |
| topic_facet | Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025432680&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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