Chemical tuning of electrical and magnetic properties in the transition metal dichalcogenides

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dc.contributor.advisorMorosan, Emiliaen_US
dc.contributor.committeeMemberKelly, Kevinen_US
dc.contributor.committeeMemberNatelson, Douglasen_US
dc.creatorChoe, Jesseen_US
dc.date.accessioned2019-05-16T19:30:15Zen_US
dc.date.available2019-05-16T19:30:15Zen_US
dc.date.created2019-05en_US
dc.date.issued2019-04-19en_US
dc.date.submittedMay 2019en_US
dc.date.updated2019-05-16T19:30:15Zen_US
dc.description.abstractTransition metal dichalcogenides are a diverse class of layered materials. Due to their quasi two-dimensional nature, they are a sandbox for investigating low dimensional physics, but can be doped in a variety of ways. Not only can substitutional doping occur on either the transition metal or chalcogen site, but intercalation between the layers can tune the system as well. Here I report on the results of three transition metal dichalcogenide systems with three drastically different results. In the Copper-Platinum-Selenium system, initial results suggest two new superconductors in the ternary phase diagram. Doping platinum into TiSe$_2$ results in an increase in the resistivity of several order of magnitude. Angle-resolved photo-emission spectroscopy shows that Platinum doping induces a pseudo gap in the system. Scanning tunneling microscopy measurements show domain wall formation. Power law fits to the resistivity suggests that the electrical transport is dominated by Luttinger liquid behavior. Finally, the intercalation of Iron into TiS$_2$ gives rise to several magnetic features. Large bowtie magnetoresistance arises showing an increase of up to 40\%. Hysteresis in magnetization shows sharp switching behavior coinciding with the bowtie in magnetoresistance. Ferromagnetic order is seen in conjunction with glassy behavior. These results are compared and contrasted to the results in Fe$_x$TiS$_2$. My results in these systems show that the depth and breadth of physical phenomena in the transition metal dichalcogenide system make it a fascinating system for investigating strongly correlated systems.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationChoe, Jesse. "Chemical tuning of electrical and magnetic properties in the transition metal dichalcogenides." (2019) Diss., Rice University. <a href="https://hdl.handle.net/1911/105426">https://hdl.handle.net/1911/105426</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/105426en_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.subjectTransition metal dichalcogenidesen_US
dc.subjectmagnetoresistanceen_US
dc.subjecthysteresisen_US
dc.subjectresistivityen_US
dc.subjectsuperconductivityen_US
dc.titleChemical tuning of electrical and magnetic properties in the transition metal dichalcogenidesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.majorCondensed Matter Physicsen_US
thesis.degree.nameDoctor of Philosophyen_US
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