Charge density wave incommensuration in tise2 systems measured with hard x-ray scattering
De La Pena Munoz, Gilberto
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https://hdl.handle.net/2142/100924
Description
Title
Charge density wave incommensuration in tise2 systems measured with hard x-ray scattering
Author(s)
De La Pena Munoz, Gilberto
Issue Date
2018-04-04
Director of Research (if dissertation) or Advisor (if thesis)
Abbamonte, Peter M.
Doctoral Committee Chair(s)
Chiang, Tai-Chang
Committee Member(s)
Clark, Bryan
Cooper, Lance
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(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.
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