자료유형  

 학위논문

Control Number  

0016933050

International Standard Book Number  

9798380579575

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Collini, John Califf.

Publication, Distribution, etc. (Imprint  

[S.l.] : University of Maryland, College Park., 2023

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Physical Description  

1 online resource(115 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-04, Section: B.

General Note  

Advisor: Paglione, Johnpierre;Butch, Nicholas.

Dissertation Note  

Thesis (Ph.D.)--University of Maryland, College Park, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The desire for a complete understanding of high temperature unconventional superconductivity has illustrated a necessity for the study of non-magnetic sources of superconducting enchantment, such as nematically driven fluctuations and charge order fluctuations. BaNi2As2, a non-magnetic counterpart to high Tc superconductor BaFe2As2, shows a six-fold superconducting enhancement neighboring charge and nematic orders, positioning it as an excellent candidate for studying the interactions between charge order, nematic order, and enhanced superconductivity. In this thesis, I will present X-ray diffraction and electrical transport evidence for the development of complex charge order within the system as functions of isovalent chemical substitution via Ba1−xSrxNi2As2 and applied hydrostatic pressure. The discovery of three separate charge orders will be detailed: an incommensurate charge order at Q = 0.28 and two commensurate charge orders at Q = 0.33 and Q = 0.5. X-ray diffraction measurements of the Q = 0.28 charge order will be used to show a strong correlation between it and a previously established nematic order for Ba1−xSrxNi2As2. Applied pressure of BaNi2As2 up to 10.4 GPa will detail the development of all three charge orders and be used to show a correlation between pressure and isovalvent substitution in BaNi2As2. The critical substitution of 71% Sr and the critical pressure of 9 ± 0.5 GPa will be directly compared by X-ray measurements of their lattice parameters, revealing a collapsed tetragonal phase. This phase is shown to be analogous to the collapsed tetragonal phase of the Fe-pnictide superconductors, likely playing a key role seen at the critical substitution and pressure of BaNi2As2.

Subject Added Entry-Topical Term  

Condensed matter physics.

Subject Added Entry-Topical Term  

Electromagnetics.

Subject Added Entry-Topical Term  

Electrical engineering.

Index Term-Uncontrolled  

Nematic superconductor

Index Term-Uncontrolled  

Superconductivity

Index Term-Uncontrolled  

Non-magnetic sources

Index Term-Uncontrolled  

Hydrostatic pressure

Index Term-Uncontrolled  

Collapsed tetragonal phase

Added Entry-Corporate Name  

University of Maryland, College Park Physics

Host Item Entry  

Dissertations Abstracts International. 85-04B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:642124