Search, Discovery, Synthesis and Characterization of Itinerant Magnets Composed of Non-magnetic Constituents

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dc.contributor.advisorMorosan, Emiliaen_US
dc.contributor.committeeMemberKono, Junichiroen_US
dc.contributor.committeeMemberDu, Rui Ruien_US
dc.creatorSvanidze, Eterien_US
dc.date.accessioned2016-01-27T17:29:29Zen_US
dc.date.available2016-01-27T17:29:29Zen_US
dc.date.created2015-05en_US
dc.date.issued2015-04-23en_US
dc.date.submittedMay 2015en_US
dc.date.updated2016-01-27T17:29:29Zen_US
dc.description.abstractThe origin of magnetism in metals has been traditionally discussed in two diametrically opposite limits: itinerant and local. Itinerant magnetism, caused by conduction electrons, has been of interest due to intriguing phenomena that frequently accompany it: heavy fermion behavior, coexistence of superconductivity and magnetism, metamagnetic transitions, spin- and cluster-glass behavior, multisublattice magnetism, non-Fermi liquid behavior, and quantum criticality. Surprisingly, while many systems exhibit both local and itinerant magnetism, only two are known to contain no local moment ions: Sc3In and ZrZn2. Doping experiments on Sc3In were used to investigate the effects of both magnetic (Er) and non-magnetic (Lu) substitutions within the itinerant matrix. While the former induces a cluster-glass state, the latter drives the system through a quantum phase transition. A novel Arrott-Noakes scaling indicates that Sc3In cannot be described by the mean-field theory, contrary to what has been seen in ZrZn2. This indicates that ZrZn2 and Sc3In are drastically different, which is likely associated with the dimensionality of spin fluctuations. Given these disparities between two seemingly analogues systems, more itinerant compounds containing non-magnetic elements are needed. While the Stoner criterion for band ferromagnetism calls for high density of states at the Fermi level together with strong electron correlations, more conditions are likely at play. A systematic search among 3d systems resulted in the discovery of the first itinerant antiferromagnet composed of non-magnetic elements TiAu. The spin density wave antiferromagnetic ordering separates this compound from the previously reported ferromagnetic ones. Furthermore, perturbation of TiAu lattice with doping resulted in an antiferromagnetic quantum critical point, which can provide insights on the validity of the self-consistent renormalization theory of spin fluctuations in itinerant magnets.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationSvanidze, Eteri. "Search, Discovery, Synthesis and Characterization of Itinerant Magnets Composed of Non-magnetic Constituents." (2015) Diss., Rice University. <a href="https://hdl.handle.net/1911/88169">https://hdl.handle.net/1911/88169</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/88169en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMagnetismen_US
dc.subjectitineranten_US
dc.subjectferromagneten_US
dc.subjectantiferromagneten_US
dc.subjectquantum critical pointen_US
dc.subjectquantum criticalityen_US
dc.subjectquantum phase transitionen_US
dc.subjecten_US
dc.titleSearch, Discovery, Synthesis and Characterization of Itinerant Magnets Composed of Non-magnetic Constituentsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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