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Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors./
Author:	Wiecki, Paul Waymouth.
Description:	1 online resource (204 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Contained By:	Dissertation Abstracts International79-11B(E).
Subject:	Condensed matter physics. -
Online resource:	click for full text (PQDT)
ISBN:	9780438076808

Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors.
Wiecki, Paul Waymouth.

Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors. - 1 online resource (204 pages)

Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.

Thesis (Ph.D.)--Iowa State University, 2018.

Includes bibliographical references

This thesis illustrates the use of the nuclear magnetic resonance (NMR) technique as a local probe for the study of static and dynamic magnetism in the iron-based superconductors.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780438076808Subjects--Topical Terms:

1148471
Condensed matter physics.
Index Terms--Genre/Form:

554714
Electronic books.

Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors.
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100 1 $a Wiecki, Paul Waymouth. $3 1190183
245 1 0 $a Nuclear Magnetic Resonance Studies of Magnetic Fluctuations and Nematic Order in Iron-based Superconductors.
264 0 $c 2018
300 $a 1 online resource (204 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
500 $a Adviser: Yuji Furukawa.
502 $a Thesis (Ph.D.)--Iowa State University, 2018.
504 $a Includes bibliographical references
520 $a This thesis illustrates the use of the nuclear magnetic resonance (NMR) technique as a local probe for the study of static and dynamic magnetism in the iron-based superconductors.
520 $a First, a Korringa ratio analysis of 59Co and 75 As NMR data reveals the existence of ferromagnetic (FM) spin fluctuations in SrCo2As2 and the hole- and electron-doped BaFe 2As2 families of iron-pnictide superconductors. The analysis further shows that the FM fluctuations compete with AFM fluctuations to suppress superconductivity in these materials. The FM fluctuations are thus a crucial ingredient to understanding the variability of the superconducting transition temperature (Tc) and the shape of the superconducting dome in these and other iron-pnictide families.
520 $a Secondly, a study of KFe2As2 under pressures up to 2.1 GPa reveals a crossover between a high-temperature incoherent, local-moment behavior and a low-temperature coherent behavior at a crossover temperature, T*. The T* is found to increase monotonically with pressure, consistent with increasing hybridization between localized 3d orbital-derived bands with the itinerant electron bands. No anomaly in T* is seen at the critical pressure where a change of slope of Tc(p) has been observed. In the superconducting state, two-component nuclear spin-lattice relaxation is observed at low temperatures, suggesting the existence of two distinct local electronic environments.
520 $a Finally, 77Se-NMR studies of FeSe subjected to external pressure and sulfur doping are presented. In pure FeSe under pressure, the NMR spectra reveal the existence of a short-range, local nematic ordered state above the bulk nematic ordering temperature. Furthermore, this local nematic order does not compete with low-energy AFM spin fluctuations. In sulfur-doped FeSe1--xSx, the observed behavior of the magnetic fluctuations parallels the Tc, providing strong evidence for the primary importance of magnetic fluctuations for superconductivity, despite the presence of nematic quantum criticality in this system.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Condensed matter physics. $3 1148471
655 7 $a Electronic books. $2 local $3 554714
690 $a 0611
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Iowa State University. $b Physics and Astronomy. $3 1148721
773 0 $t Dissertation Abstracts International $g 79-11B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10752362 $z click for full text (PQDT)