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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.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	STM Imaging of Strong Orbital-selective Correlations in FeSe./
作者:	Kostin, Andrey.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	146 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Contained By:	Dissertation Abstracts International79-10B(E).
標題:	Condensed matter physics. -
電子資源:	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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