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Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-4085
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dc.contributor.authorDrozdov, Alexander
dc.date.accessioned2016-07-15T12:24:46Z
dc.date.available2016-07-15T14:24:46Z
dc.date.issued2016
dc.identifier.urihttps://openscience.ub.uni-mainz.de/handle/20.500.12030/4087-
dc.description.abstractA room temperature superconductor is probably one of the most desired systems in solid state physics. The highest critical temperature (Tc) that has been achieved so far is in the copper oxide system: 133 kelvin (K) at ambient pressure ([82]Schilling et al. 1993) and 160 K under pressure ([42]Gao et al. 1994). The nature of superconductivity in the cuprates and in the recently discovered iron-based supercondutor family (Tc=57 K) is still not fully understood. In contrast, there is a class of superconductors which is well-described by the Bardeen, Cooper, Schrieffer (BCS) theory - convetional superconductors. Great efforts were spent in searching for high-temperature (Tc > 77 K) conventional superconductor but only Tc = 39 K has been reached in MgB2 ([68]Nagamatsu et al. 2001). BCS theory puts no bounds for Tc as follows from Eliashberg’s formulation of BCS theory. Tc can be high, if there is a favorable combination of high-frequency phonons, strong electron–phonon coupling, and a high density of states. It does not predict however in which materials all three parameters are large. At least it gives a clear indication that materials with light elements are favorable as light elements provide high frequencies in the phonon spectrum. The lightest element is hydrogen, and Ashcroft made a first prediction that metallic hydrogen will be a high-temperature superconductor ([6]Ashcroft 1968). As pressure of hydrogen metallization was too high (about 400-500 GPa) for experimental techniques then he proposed that compounds dominated by hydrogen (hydrides) also might be good high temperature superconductors ([6]Ashcroft 1968; [7]Ashcroft 2004). A lot of the followed calculations supported this idea. Tc in the range of 50–235 kelvin was predicted for many hydrides. Unfortunately, only a moderate Tc of 17 kelvin has been observed experimentally ([27]Eremets et al. 2008) so far. A goal of the present work is to find a hydrogen-dominant material with higher Tc.en_GB
dc.language.isoeng
dc.rightsInCopyrightde_DE
dc.rights.urihttps://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc540 Chemiede_DE
dc.subject.ddc540 Chemistry and allied sciencesen_GB
dc.titleSuperconductivity in hydrogen-rich materials at high pressuresde_DE
dc.typeDissertationde_DE
dc.identifier.urnurn:nbn:de:hebis:77-diss-1000005734
dc.identifier.doihttp://doi.org/10.25358/openscience-4085-
jgu.type.dinitypedoctoralThesis
jgu.type.versionOriginal worken_GB
jgu.type.resourceText
jgu.description.extent90 Blätter
jgu.organisation.departmentFB 09 Chemie, Pharmazie u. Geowissensch.-
jgu.organisation.year2016
jgu.organisation.number7950-
jgu.organisation.nameJohannes Gutenberg-Universität Mainz-
jgu.rights.accessrightsopenAccess-
jgu.organisation.placeMainz-
jgu.subject.ddccode540
opus.date.accessioned2016-07-15T12:24:46Z
opus.date.modified2016-08-01T11:44:39Z
opus.date.available2016-07-15T14:24:46
opus.subject.dfgcode00-000
opus.organisation.stringFB 09: Chemie, Pharmazie und Geowissenschaften: Institut für Anorganische Chemie und Analytische Chemiede_DE
opus.identifier.opusid100000573
opus.institute.number0903
opus.metadataonlyfalse
opus.type.contenttypeDissertationde_DE
opus.type.contenttypeDissertationen_GB
jgu.organisation.rorhttps://ror.org/023b0x485
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