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Title:Charge density wave incommensuration in tise2 systems measured with hard x-ray scattering
Author(s):De La Pena Munoz, Gilberto
Director of Research:Abbamonte, Peter M
Doctoral Committee Chair(s):Chiang, Tai-Chang
Doctoral Committee Member(s):Clark, Bryan; Cooper, Lance
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):TiSe2
CDW
Charge density wave
Superconductivity
X-rays
Phase transition
Incommensurate
Abstract:Unconventional superconductivity cannot be understood independently of the phases that order around it. Characterizing the charge order in modulated superconductors provides essential information that could reveal a common underlying mechanism. We performed low temperature experiments on 1T-TiSe 2 crystals tuned by three parameters: pressure, copper intercalation, and sulfur substitution. Resistivity measurements revealed a previously unreported superconductive phase in sulfur substituted samples. Our hard x-ray diffraction experiments determined that the charge order phase does not terminate inside the superconductive phase of these systems, as was formerly believed. The phase diagrams established in this work suggest that incommensurations of the charge density wave could play a role in the emergence of superconductivity.
Issue Date:2018-04-04
Type:Thesis
URI:http://hdl.handle.net/2142/100924
Rights Information:Copyright 2018 Gilberto De La Pena Munoz
Date Available in IDEALS:2018-09-04
Date Deposited:2018-05


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