東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

A magnetism-based approach to examin...

Phelan, Brendan F.

Linked to FindBook

Google Book

Amazon

博客來

A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra./
Author:	Phelan, Brendan F.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	86 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
Contained By:	Dissertation Abstracts International77-11B(E).
Subject:	Inorganic chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10120346
ISBN:	9781339815282

A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra.
Phelan, Brendan F.

A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 86 p.

Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2016.

This thesis explores the relative strengths of Spin-Orbit Coupling (SOC) in several perovskite-like systems that feature uninterrupted arrays of isolated IrO6 octahedra. Iridate compounds are particularly interesting to the community due to their relevance to emergent material properties such as insulating antiferromagnets, superconductors, and topological insulators. Recently literature has pointed to a complex interaction between SOC and crystal field splitting (CFS) in d5 metals. I utilize a straightforward, magnetic approach to determine the relative strengths of SOC vs CFS by chemically modifying structure and oxidation state. This contrasts with other work where advanced spectroscopic measurements are utilized to probe energy levels within a single compound. The focus of this study lies in two main methodologies: 1) Tracking the evolution of the Ir magnetic moment on progressing from 5 d5 Ir4+ to 5d 4 Ir5+ oxidation states that are clearly best described by a transition from a J=1/2 to a J=0 Ir magnetic state. In these cases, the evolution of the magnetic susceptibility shows the dominance of spin-orbit coupling in determining the magnetic properties of a material with highly isolated IrO6 octahedra. 2) Distorting J=0 Ir5+ systems where there is no emergence of an enhanced magnetic moment in the series on increasing the structural distortions, as would have been the case for significant crystal field splitting that reinforces the notion that spin-orbit coupling is the dominant force in determining the magnetism of iridium-oxygen octahedra in perovskite-like structures. The organization of this thesis is as follows: Chapter 1 presents a brief introduction to solid-state chemistry, iridates, and magnetism. Chapter 2 is an overview of experimental methodology and instrumentation. Chapter 3, presents a study of tuning the oxidation state of a new structure type: SrxLa11-xIr4O24. Chapter 4 presents a structural tuning of the Ir5+ system: Ba 2-xSrxYIrO6. Finally, Chapter 5 provides a brief glimpse of the future of this new approach to studying this type of iridium-oxygen compounds.

ISBN: 9781339815282Subjects--Topical Terms:

3173556
Inorganic chemistry.

A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra.
LDR:03063nmm a2200289 4500 001 2120449
005 20170719065341.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781339815282
035 $a (MiAaPQ)AAI10120346
035 $a AAI10120346
040 $a MiAaPQ $c MiAaPQ
100 1 $a Phelan, Brendan F. $3 3282385
245 1 2 $a A magnetism-based approach to examining spin-orbit coupling effects in solid systems of isolated iridium octahedra.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 86 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
500 $a Adviser: Robert J. Cava.
502 $a Thesis (Ph.D.)--Princeton University, 2016.
520 $a This thesis explores the relative strengths of Spin-Orbit Coupling (SOC) in several perovskite-like systems that feature uninterrupted arrays of isolated IrO6 octahedra. Iridate compounds are particularly interesting to the community due to their relevance to emergent material properties such as insulating antiferromagnets, superconductors, and topological insulators. Recently literature has pointed to a complex interaction between SOC and crystal field splitting (CFS) in d5 metals. I utilize a straightforward, magnetic approach to determine the relative strengths of SOC vs CFS by chemically modifying structure and oxidation state. This contrasts with other work where advanced spectroscopic measurements are utilized to probe energy levels within a single compound. The focus of this study lies in two main methodologies: 1) Tracking the evolution of the Ir magnetic moment on progressing from 5 d5 Ir4+ to 5d 4 Ir5+ oxidation states that are clearly best described by a transition from a J=1/2 to a J=0 Ir magnetic state. In these cases, the evolution of the magnetic susceptibility shows the dominance of spin-orbit coupling in determining the magnetic properties of a material with highly isolated IrO6 octahedra. 2) Distorting J=0 Ir5+ systems where there is no emergence of an enhanced magnetic moment in the series on increasing the structural distortions, as would have been the case for significant crystal field splitting that reinforces the notion that spin-orbit coupling is the dominant force in determining the magnetism of iridium-oxygen octahedra in perovskite-like structures. The organization of this thesis is as follows: Chapter 1 presents a brief introduction to solid-state chemistry, iridates, and magnetism. Chapter 2 is an overview of experimental methodology and instrumentation. Chapter 3, presents a study of tuning the oxidation state of a new structure type: SrxLa11-xIr4O24. Chapter 4 presents a structural tuning of the Ir5+ system: Ba 2-xSrxYIrO6. Finally, Chapter 5 provides a brief glimpse of the future of this new approach to studying this type of iridium-oxygen compounds.
590 $a School code: 0181.
650 4 $a Inorganic chemistry. $3 3173556
650 4 $a Materials science. $3 543314
690 $a 0488
690 $a 0794
710 2 $a Princeton University. $b Chemistry. $3 2094742
773 0 $t Dissertation Abstracts International $g 77-11B(E).
790 $a 0181
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10120346