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STM Imaging of Strong Orbital-select...

Kostin, Andrey.

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STM Imaging of Strong Orbital-selective Correlations in FeSe.

Record Type:	Electronic resources : Monograph/item
Title/Author:	STM Imaging of Strong Orbital-selective Correlations in FeSe./
Author:	Kostin, Andrey.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	146 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Contained By:	Dissertation Abstracts International79-10B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10808891
ISBN:	9780438026209

STM Imaging of Strong Orbital-selective Correlations in FeSe.
Kostin, Andrey.

STM Imaging of Strong Orbital-selective Correlations in FeSe. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 146 p.

Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.

Thesis (Ph.D.)--Cornell University, 2018.

High temperature superconductivity is typically found in the vicinity of a magnetically ordered phase. The parent state of iron-based superconductors is most often a collinear antiferromagnet that breaks the tetragonal symmetry of the high temperature phase. Such a magnetically ordered state is accompanied by an orthorhombic lattice distortion and the nematic ordering of electronic degrees of freedom. Intriguingly, FeSe is an iron-based superconductor that realizes nematic ordering in the absence of any long range magnetic order. A recent scanning tunneling microscopy (STM) experiment deduced the superconducting gap structure of FeSe suggesting that in this material orbital selectivity plays a significant role in superconducting pairing. Within a multi-orbital Hubbard model for iron-based superconductors, such orbital selectivity is expected and driven by a sizable Hund's coupling. In this thesis, I use STM to visualize quasiparticle interference patterns in the unusual nematic state of FeSe. The analysis of these patterns demonstrates that the quasi-particle weight is significantly larger for the dyz orbitals than for the dxz and dxy orbitals. This establishes the existence of strong orbital-selective correlations in FeSe. Additionally, I identify significant directionality in the atomic structure of local density of states images in FeSe at low temperature. This is a novel method for visualizing nematicity in iron-based superconductors.

ISBN: 9780438026209Subjects--Topical Terms:

3173567
Condensed matter physics.

STM Imaging of Strong Orbital-selective Correlations in FeSe.
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020 $a 9780438026209
035 $a (MiAaPQ)AAI10808891
035 $a (MiAaPQ)cornellgrad:10773
035 $a AAI10808891
040 $a MiAaPQ $c MiAaPQ
100 1 $a Kostin, Andrey. $0 (orcid)0000-0002-0854-6396 $3 3429477
245 1 0 $a STM Imaging of Strong Orbital-selective Correlations in FeSe.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 146 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
500 $a Adviser: James C. Davis.
502 $a Thesis (Ph.D.)--Cornell University, 2018.
520 $a High temperature superconductivity is typically found in the vicinity of a magnetically ordered phase. The parent state of iron-based superconductors is most often a collinear antiferromagnet that breaks the tetragonal symmetry of the high temperature phase. Such a magnetically ordered state is accompanied by an orthorhombic lattice distortion and the nematic ordering of electronic degrees of freedom. Intriguingly, FeSe is an iron-based superconductor that realizes nematic ordering in the absence of any long range magnetic order. A recent scanning tunneling microscopy (STM) experiment deduced the superconducting gap structure of FeSe suggesting that in this material orbital selectivity plays a significant role in superconducting pairing. Within a multi-orbital Hubbard model for iron-based superconductors, such orbital selectivity is expected and driven by a sizable Hund's coupling. In this thesis, I use STM to visualize quasiparticle interference patterns in the unusual nematic state of FeSe. The analysis of these patterns demonstrates that the quasi-particle weight is significantly larger for the dyz orbitals than for the dxz and dxy orbitals. This establishes the existence of strong orbital-selective correlations in FeSe. Additionally, I identify significant directionality in the atomic structure of local density of states images in FeSe at low temperature. This is a novel method for visualizing nematicity in iron-based superconductors.
590 $a School code: 0058.
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Low temperature physics. $3 3173917
690 $a 0611
690 $a 0598
710 2 $a Cornell University. $b Physics. $3 3173885
773 0 $t Dissertation Abstracts International $g 79-10B(E).
790 $a 0058
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10808891