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Iron pnictide superconductors

Abstract

The scope of this dissertation therefore has not only been the synthesis of various new superconducting and non-superconducting iron pnictides of several structural families but also their in-depth crystallographic and physical characterisation. In Chapters 3 - 6, the family of the ZrCuSiAs-type (1111) compounds is subject of discussion. The solid solution series La(Co{sub x}Fe{sub 1-x})PO is analysed regarding magnetic and superconducting properties and the new compounds EuMnPF and REZnPO, as well as the new superconductor parent compound SrFeAsF are presented. Chapters 7 - 9 are dedicated to the new iron arsenide superconductors of the ThCr{sub 2}Si{sub 2}-type (122 family). Therein, also the discovery of the first superconductor in this structural family, Ba{sub 0.6}K{sub 0.4}Fe{sub 2}As{sub 2}, is unveiled. A detailed examination of the complete solid solution series (Ba{sub 1-x}K{sub x})Fe{sub 2}As{sub 2} is presented. Moreover, the crystallographic phase transitions of the closely related compounds SrFe{sub 2}As{sub 2} and EuFe{sub 2}As{sub 2} are characterised and the superconductors Sr{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} and Ca{sub 1-x}Na{sub x}Fe{sub 2}As{sub 2} are examined for magnetic and phononic excitations. In Chapter 10, the redetermined crystal structure of the superconductor Fe(Se{sub 1-x}Te{sub x}) (11-type) is presented from a chemist's point of view. Chapters 11 - 14  More>>
Publication Date:
Mar 22, 2011
Product Type:
Thesis/Dissertation
Report Number:
INIS-DE-1219
Resource Relation:
Other Information: TH: Diss.
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHROMIUM COMPOUNDS; COBALT OXIDES; COBALT PHOSPHIDES; CRYSTAL STRUCTURE; CRYSTAL-PHASE TRANSFORMATIONS; DEBYE-SCHERRER METHOD; EUROPIUM FLUORIDES; EUROPIUM PHOSPHIDES; EXPERIMENTAL DATA; IRON ARSENIDES; IRON FLUORIDES; IRON OXIDES; IRON PHOSPHIDES; IRON SELENIDES; IRON TELLURIDES; LANTHANUM OXIDES; LANTHANUM PHOSPHIDES; MAGNETIC SUSCEPTIBILITY; MANGANESE FLUORIDES; MANGANESE PHOSPHIDES; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; POTASSIUM COMPOUNDS; SCANDIUM OXIDES; SCANNING ELECTRON MICROSCOPY; STRONTIUM FLUORIDES; SUPERCONDUCTIVITY; VANADIUM ARSENIDES; ZINC OXIDES; ZINC PHOSPHIDES
OSTI ID:
21520893
Research Organizations:
Muenchen Univ. (Germany). Fakultaet fuer Chemie und Pharmazie
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
TRN: DE12F0083
Availability:
Commercial reproduction prohibited; INIS; OSTI as DE21520893
Submitting Site:
DEN
Size:
297 pages
Announcement Date:
Jan 14, 2012

Citation Formats

Tegel, Marcus Christian. Iron pnictide superconductors. Germany: N. p., 2011. Web.
Tegel, Marcus Christian. Iron pnictide superconductors. Germany.
Tegel, Marcus Christian. 2011. "Iron pnictide superconductors." Germany.
@misc{etde_21520893,
title = {Iron pnictide superconductors}
author = {Tegel, Marcus Christian}
abstractNote = {The scope of this dissertation therefore has not only been the synthesis of various new superconducting and non-superconducting iron pnictides of several structural families but also their in-depth crystallographic and physical characterisation. In Chapters 3 - 6, the family of the ZrCuSiAs-type (1111) compounds is subject of discussion. The solid solution series La(Co{sub x}Fe{sub 1-x})PO is analysed regarding magnetic and superconducting properties and the new compounds EuMnPF and REZnPO, as well as the new superconductor parent compound SrFeAsF are presented. Chapters 7 - 9 are dedicated to the new iron arsenide superconductors of the ThCr{sub 2}Si{sub 2}-type (122 family). Therein, also the discovery of the first superconductor in this structural family, Ba{sub 0.6}K{sub 0.4}Fe{sub 2}As{sub 2}, is unveiled. A detailed examination of the complete solid solution series (Ba{sub 1-x}K{sub x})Fe{sub 2}As{sub 2} is presented. Moreover, the crystallographic phase transitions of the closely related compounds SrFe{sub 2}As{sub 2} and EuFe{sub 2}As{sub 2} are characterised and the superconductors Sr{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} and Ca{sub 1-x}Na{sub x}Fe{sub 2}As{sub 2} are examined for magnetic and phononic excitations. In Chapter 10, the redetermined crystal structure of the superconductor Fe(Se{sub 1-x}Te{sub x}) (11-type) is presented from a chemist's point of view. Chapters 11 - 14 look into the superconducting and non-superconducting iron arsenides of more complex structural families (32522-type and 21311-type). Therein, crystallographic and magnetic details of Sr{sub 3}Sc{sub 2}O{sub 5}Fe{sub 2}As{sub 2} are presented and Ba{sub 2}ScO{sub 3}FeAs and Sr{sub 2}CrO{sub 3}FeAs, the first two members of the new 21311-type are portrayed. Sr{sub 2}CrO{sub 3}FeAs is looked at in close detail with various methods, so e.g. the spin structure of the magnetically ordered compound is solved and a possible reason for the absence of superconductivity in this compound is given. Finally, the superconductor Sr{sub 2}VO{sub 3}FeAs is scrutinised and necessary prerequisites for superconductivity in this compound are suggested. (orig.)}
place = {Germany}
year = {2011}
month = {Mar}
}