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Title:Inelastic Light Scattering Studies of Quantum Phase Transitions in Copper Titanium Diselenium and Multiferroic Terbium Manganese Trioxygen
Author(s):Barath, Harini
Doctoral Committee Chair(s):Abbamonte, Peter M.
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Condensed Matter
Abstract:The second focus of this dissertation is the study of quantum phase transitions in TiSe2 as a function of temperature and Cu-intercalation, and the comparison of the effects of intercalation and pressure on the charge-density-wave (CDW) order in this system. All these parameters---temperature, pressure and Cu-intercalation---suppress the CDW state in TiSe2. Our Raman measurements on CuxTiSe2 show that the x-dependent mode softening exhibits identical scaling behavior to thermal mode softening in undoped TiSe2, suggesting that, like thermal mode softening, the x-dependent mode softening is also associated with a critical point. The softening and significant linewidth broadening of the observed CDW amplitude modes indicate strong fluctuations of the CDW. Even more interesting is the emergence of a superconducting (SC) phase---in CuxTiSe2 and pressure-tuned TiSe 2---indicating a likely coexistence of fluctuating CDW and SC phases near the quantum phase boundary.
Issue Date:2010
Description:102 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010.
Other Identifier(s):(MiAaPQ)AAI3430925
Date Available in IDEALS:2015-09-25
Date Deposited:2010

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