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Thermodynamic and transport properti...

Boyd, G. R.

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Thermodynamic and transport properties of unconventional superconductors and multiferroics.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermodynamic and transport properties of unconventional superconductors and multiferroics./
Author:	Boyd, G. R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2010,
Description:	156 p.
Notes:	Source: Dissertations Abstracts International, Volume: 73-02, Section: B.
Contained By:	Dissertations Abstracts International73-02B.
Subject:	Low Temperature Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3467671
ISBN:	9781124796291

Thermodynamic and transport properties of unconventional superconductors and multiferroics.
Boyd, G. R.

Thermodynamic and transport properties of unconventional superconductors and multiferroics. - Ann Arbor : ProQuest Dissertations & Theses, 2010 - 156 p.

Source: Dissertations Abstracts International, Volume: 73-02, Section: B.

Thesis (Ph.D.)--University of Florida, 2010.

This item is not available from ProQuest Dissertations & Theses.

Often, the phase diagram for a given material can be quite complex, presenting evidence for multiple orders and it is the task of the condensed matter community to describe and quantify knowledge of these properties. Significant insight can often be gained by comparing model calculations of basic thermodynamic and transport properties of a material with experiment. Here we consider two classes of novel materials whose rich phase diagrams are actively under investigation: unconventional superconductors and multiferroics. In 2006, H. Hosono discovered a new class of iron-based superconducting materials which are not conventional superconductors. After the initial discovery, there is a range of questions of immediate interest; foremost among them is what is the structure and symmetry of the superconducting state, a question which took roughly a decade to answer for the cuprate superconductors. We present calculations that help reveal the structure of the superconducting gap using angle dependent specific heat measurements. We then calculate the electronic Raman scattering intensity for several polarizations of light and different models of disorder, providing information about the anisotropy and location of nodes in the superconducting gap. Understanding the influence of disorder is considered crucial because currently conflicting experimental results may be due to differences in sample quality. Recently, there has also been interest in multiferroics: materials with simultaneous non-zero polarization and magnetic order. We present calculations of fundamental thermodynamic properties, mean field behavior for the simplest ferromagnetic-ferroelectric, characterize topological defects, and use the perturbative renormalization group to help understand the critical point, as a beginning towards understanding the multitude multiferroic materials with increasingly complex magnetic and polar order. The first two chapters review conventional superconductivity and its unconventional counterpart found in the cuprates and pnictides. The original work constituting the body of this dissertation appears in chapters three through five. Chapter five contains a brief introduction to the topics which are relevant for multiferroics before presenting the original work. Portions of this thesis are based on the author's publications and are cited when relevant.

ISBN: 9781124796291Subjects--Topical Terms:

1244627
Low Temperature Physics.

Thermodynamic and transport properties of unconventional superconductors and multiferroics.
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245 1 0 $a Thermodynamic and transport properties of unconventional superconductors and multiferroics.
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500 $a Source: Dissertations Abstracts International, Volume: 73-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Hirschfeld, P. J.
502 $a Thesis (Ph.D.)--University of Florida, 2010.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Often, the phase diagram for a given material can be quite complex, presenting evidence for multiple orders and it is the task of the condensed matter community to describe and quantify knowledge of these properties. Significant insight can often be gained by comparing model calculations of basic thermodynamic and transport properties of a material with experiment. Here we consider two classes of novel materials whose rich phase diagrams are actively under investigation: unconventional superconductors and multiferroics. In 2006, H. Hosono discovered a new class of iron-based superconducting materials which are not conventional superconductors. After the initial discovery, there is a range of questions of immediate interest; foremost among them is what is the structure and symmetry of the superconducting state, a question which took roughly a decade to answer for the cuprate superconductors. We present calculations that help reveal the structure of the superconducting gap using angle dependent specific heat measurements. We then calculate the electronic Raman scattering intensity for several polarizations of light and different models of disorder, providing information about the anisotropy and location of nodes in the superconducting gap. Understanding the influence of disorder is considered crucial because currently conflicting experimental results may be due to differences in sample quality. Recently, there has also been interest in multiferroics: materials with simultaneous non-zero polarization and magnetic order. We present calculations of fundamental thermodynamic properties, mean field behavior for the simplest ferromagnetic-ferroelectric, characterize topological defects, and use the perturbative renormalization group to help understand the critical point, as a beginning towards understanding the multitude multiferroic materials with increasingly complex magnetic and polar order. The first two chapters review conventional superconductivity and its unconventional counterpart found in the cuprates and pnictides. The original work constituting the body of this dissertation appears in chapters three through five. Chapter five contains a brief introduction to the topics which are relevant for multiferroics before presenting the original work. Portions of this thesis are based on the author's publications and are cited when relevant.
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