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Investigation of Unconventional Supe...

Wang, BaiYang,

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Investigation of Unconventional Superconductivity in Infinite-Layer Nickelates /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigation of Unconventional Superconductivity in Infinite-Layer Nickelates // BaiYang Wang.
Author:	Wang, BaiYang,
Description:	1 electronic resource (115 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
Contained By:	Dissertations Abstracts International85-03B.
Subject:	Condensed matter physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30593435
ISBN:	9798380273350

Investigation of Unconventional Superconductivity in Infinite-Layer Nickelates /
Wang, BaiYang,

Investigation of Unconventional Superconductivity in Infinite-Layer Nickelates /BaiYang Wang. - 1 electronic resource (115 pages)

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

More than one century after the initial discovery of superconductivity in mercury, there remain entire classes of materials whose superconducting mechanisms have yet to be elucidated. One major avenue through which experimentalists contribute in this research has been finding new examples of unconventional superconductors. A recent trend in this material search is to combine traditional material synthesis methods with novel sample manipulation techniques in pursuit of materials in novel geometries. For example, topotactic reduction has demonstrated impressive capabilities to modify oxygen stoichiometry and achieving extreme valence states of 3d transition metal ions in complex oxide systems. In this thesis, I will introduce the infinite-layer nickelates obtained using this method as a new family of 3d-transition-metal-based unconventional superconductors. I will show that this system is a local type-II superconductor with singlet pairing and nodal superconducting gap structure, whose upper critical field generically violates the Pauli limit and whose superfluid density is so low that the superconductivity might be phase coherence limited. I will further identify the importance of rare earth 4fmoments in shaping the superconductivity. Overall, I hope to show that this new system presents an additional source of experimental insight into unconventional superconductivity.

English

ISBN: 9798380273350Subjects--Topical Terms:

3173567
Condensed matter physics.

Investigation of Unconventional Superconductivity in Infinite-Layer Nickelates /
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500 $a Advisors: Fisher, Ian; Kivelson, Steven; Hwang, Harold Committee members: Bent, Stacey F.
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520 $a More than one century after the initial discovery of superconductivity in mercury, there remain entire classes of materials whose superconducting mechanisms have yet to be elucidated. One major avenue through which experimentalists contribute in this research has been finding new examples of unconventional superconductors. A recent trend in this material search is to combine traditional material synthesis methods with novel sample manipulation techniques in pursuit of materials in novel geometries. For example, topotactic reduction has demonstrated impressive capabilities to modify oxygen stoichiometry and achieving extreme valence states of 3d transition metal ions in complex oxide systems. In this thesis, I will introduce the infinite-layer nickelates obtained using this method as a new family of 3d-transition-metal-based unconventional superconductors. I will show that this system is a local type-II superconductor with singlet pairing and nodal superconducting gap structure, whose upper critical field generically violates the Pauli limit and whose superfluid density is so low that the superconductivity might be phase coherence limited. I will further identify the importance of rare earth 4fmoments in shaping the superconductivity. Overall, I hope to show that this new system presents an additional source of experimental insight into unconventional superconductivity.
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