Resource type
Thesis type
(Thesis) M.Sc.
Date created
2013-12-18
Authors/Contributors
Author: Mohtashemi, Laleh
Abstract
This thesis presents measurements of the dynamical conductivity of a MnSi lm via terahertz time domain spectroscopy. We determine the Drude scattering rate and plasma frequency at low temperatures, and compare these to theoretical predictions. From a comparison of the plasma frequency measurement with band theory, we determine a mass renormalization of m*/m~5.5. Above the critical temperature, ts to the Drude model yield negative values for the scattering lifetime, indicating the existence of a pseudogap. At low temperatures and low frequencies, the resistivity has the well-known Fermi liquid form with the ratio of the temperature dependent term to the frequency dependent term, b>1. At the lowest temperature we estimate b ~ 4, with a large systematic uncertainty that we characterize for later improvement. This result is consistent with Fermi liquid theory predictions for electron-electron scattering.
Document
Identifier
etd8197
Copyright statement
Copyright is held by the author.
Scholarly level
Supervisor or Senior Supervisor
Thesis advisor: Dodge, J. Steven
Member of collection
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etd8197_LMohtashemi.pdf | 7.69 MB |