Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites

Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites

Bibliographic Details
Main Author: Janczak, Julia
Language:English
Published: The Ohio State University / OhioLINK 2012
Subjects:
Physics
double perovskites
optical conductivity
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1354713689
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu13547136892021-08-03T06:06:47Z Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites Janczak, Julia Physics double perovskites optical conductivity In this work, we summarize developments in the study of itinerant ferromagnetism that led to the current surge of interest in double perovskites and discuss recent experimental efforts that have been remarkably successful in producing and characterizing these compounds. We then present original theoretical calculations of the spin resolved spectral function and optical conductivity as a function of temperature and antisite (AS) disorder for the archetypal half-metallic double perovskite SFMO. We use exact diagonalization in combination with classical Monte Carlo to capture the dynamics of itinerant electrons coupled to thermally fluctuating local moments. Twisted boundary conditions are employed to minimize finite size effects. Our calculations of the spectral function show distinct signatures from thermal fluctuations and AS disorder that may be directly measured by ARPES experiments. We propose that such experiments could verify the half-metallic nature of SFMO as well as provide a probe of AS disorder. Thermal fluctuations and AS disorder produce a secondary peak in the optical spectrum, consistent with experiment. We demonstrate how this feature is correlated with the polarization of conduction electrons and the amount of disorder. Our calculations of the spin resolved conductivity show that the DC current remains largely spin polarized despite small amounts of AS disorder. Our results have important implications for spintronic applications. 2012-12-20 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1354713689 http://rave.ohiolink.edu/etdc/view?acc_num=osu1354713689 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Physics
double perovskites
optical conductivity
spellingShingle Physics
double perovskites
optical conductivity
Janczak, Julia
Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
author Janczak, Julia
author_facet Janczak, Julia
author_sort Janczak, Julia
title Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
title_short Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
title_full Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
title_fullStr Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
title_full_unstemmed Theory of Spectral Function and Optical Conductivity for Half-Metallic Double Perovskites
title_sort theory of spectral function and optical conductivity for half-metallic double perovskites
publisher The Ohio State University / OhioLINK
publishDate 2012
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1354713689
work_keys_str_mv AT janczakjulia theoryofspectralfunctionandopticalconductivityforhalfmetallicdoubleperovskites
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