Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity

The most prominent indicators of superconductivity are the superconducting transition temperature (Tc) and the superconducting energy gap (Δ). These indicators associated with electronic state of temperature dependence of resistivity and specific heat measurements, respectively. The specific heat is...

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Main Author:	Ahmad, Tarek Mohamed Fayez
Format:	Thesis
Language:	English
Published:	2013
Subjects:	QC1 Physics (General)
Online Access:	http://eprints.usm.my/43999/1/Tarek%20Mohamed%20Fayez%20Ahmad24.pdf
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spelling	my-usm-ep.439992019-04-12T05:26:09Z Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity 2013-10 Ahmad, Tarek Mohamed Fayez QC1 Physics (General) The most prominent indicators of superconductivity are the superconducting transition temperature (Tc) and the superconducting energy gap (Δ). These indicators associated with electronic state of temperature dependence of resistivity and specific heat measurements, respectively. The specific heat is a bulk measurement that reflects the behavior of the entire sample response. Here, we introduce a model that examines the transition characteristic to a normal/superconducting state at a critical temperature of the electron and phonon contributions of specific heat. Three basic postulates were adopted. First is that the transition of the system from normal to superconducting state, which allows phonons to bind electrons to form Cooper pairs, requiring a change in energy differences appearing in a specific heat behavior. Second, specific heat has different contributions, changing differently at Tc. This change is possibly a result of the physical function on such contributions. The third postulate is that phonon behavior can manifest superconductive property, particularly in the coexisting state. Based on the suggested superconducting transition model, which was constructed depending on the superconductive behavior of specific heat in accordance with above postulates, energy scales were obtained at normal state for iron-based oxypnictides. The pseudogap 2Δ was 14.26 meV for the SmO0.80F0.20FeAs compound, which was determined from the far-infrared reflectance spectra based on the phonon state at room temperature. 2013-10 Thesis http://eprints.usm.my/43999/ http://eprints.usm.my/43999/1/Tarek%20Mohamed%20Fayez%20Ahmad24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Fizik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QC1 Physics (General)
spellingShingle	QC1 Physics (General) Ahmad, Tarek Mohamed Fayez Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
description	The most prominent indicators of superconductivity are the superconducting transition temperature (Tc) and the superconducting energy gap (Δ). These indicators associated with electronic state of temperature dependence of resistivity and specific heat measurements, respectively. The specific heat is a bulk measurement that reflects the behavior of the entire sample response. Here, we introduce a model that examines the transition characteristic to a normal/superconducting state at a critical temperature of the electron and phonon contributions of specific heat. Three basic postulates were adopted. First is that the transition of the system from normal to superconducting state, which allows phonons to bind electrons to form Cooper pairs, requiring a change in energy differences appearing in a specific heat behavior. Second, specific heat has different contributions, changing differently at Tc. This change is possibly a result of the physical function on such contributions. The third postulate is that phonon behavior can manifest superconductive property, particularly in the coexisting state. Based on the suggested superconducting transition model, which was constructed depending on the superconductive behavior of specific heat in accordance with above postulates, energy scales were obtained at normal state for iron-based oxypnictides. The pseudogap 2Δ was 14.26 meV for the SmO0.80F0.20FeAs compound, which was determined from the far-infrared reflectance spectra based on the phonon state at room temperature.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ahmad, Tarek Mohamed Fayez
author_facet	Ahmad, Tarek Mohamed Fayez
author_sort	Ahmad, Tarek Mohamed Fayez
title	Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
title_short	Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
title_full	Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
title_fullStr	Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
title_full_unstemmed	Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity
title_sort	determination of energy gap of the iron-based oxypnictide and laofege superconductors using specific heat capacity
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Fizik
publishDate	2013
url	http://eprints.usm.my/43999/1/Tarek%20Mohamed%20Fayez%20Ahmad24.pdf
_version_	1747821316235329536

Determination Of Energy Gap Of The Iron-Based Oxypnictide And Laofege Superconductors Using Specific Heat Capacity

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