Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies
Yoon, Seokhyun
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https://hdl.handle.net/2142/80479
Description
Title
Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies
Author(s)
Yoon, Seokhyun
Issue Date
2001
Doctoral Committee Chair(s)
Cooper, S.L.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
We observed that the metal-insulator transition in Ca3Ru 2O7 is characterized by the opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We also observed Raman scattering from two-magnon excitations in the antiferromagnetic phase of Ca3Ru 2O7, from which we could estimate the in-plane spin-spin exchange coupling constant J∥. Importantly, we found that Ca3Ru2O7 does not exhibit strong in-plane magnetic correlations above TN.
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