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Understanding unconventional superco...

Almeida Firmo, Ines.

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Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates./
Author:	Almeida Firmo, Ines.
Description:	134 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
Contained By:	Dissertation Abstracts International75-10B(E).
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583130
ISBN:	9781321125924

Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates.
Almeida Firmo, Ines.

Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates. - 134 p.

Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.

Thesis (Ph.D.)--Cornell University, 2014.

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

Unconventional superconductors provide, today, some of the most fundamental challenges in condensed-matter physics, besides their unimaginable potential for applications. Here, we will discuss two of these materials. Firstly, we will focus on Sr2RuO4, one of the most promising candidates to exhibit chiral p-wave superconductivity, analogously to a two-dimensional (2D) film of 3He-A. Some of the outstanding challenges regarding this multi-band superconductor remain, including the knowledge of which band(s) are primarily responsible for the appearance of superconductivity. Solving this issue will help us understand the symmetry of the pairing and, eventually, the pairing mechanism. We report scanning tunneling microscopy (STM) studies confirming a nodal superconducting gap structure and indicating that the quasi-one-dimensional (1D) bands are most important for superconductivity in Sr2RuO4. We suggest an experimental avenue to confirm this observation and determine the pairing symmetry beyond doubt. We then turn to a discussion of the hole-doped cuprate high-temperature superconductors, with a focus on their mysterious pseudogap regime and its Q = 0 and Q ≠ 0 electronic broken symmetries. Development of novel spectroscopic imaging STM (SI-STM) techniques allowed the quantitative measurement of such broken symmetries (also seen by other probes) and their inter-relations. We report on these novel techniques in detail, in particular Fourier phase determination of STM data, and study extensively the hole doping, p, dependence of the broken symmetries as well as the Fermi surface topology for Bi2Sr 2CaCu2O8+delta samples spanning the phase diagram between 0.06 ≤ p ≤ 0.23. We show that the electronic symmetry breaking tendencies weaken with increasing p and disappear close to pc = 0.19. Concomitantly, the coherent k-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc. These data reveal that the k-space topology transformation in the cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.

ISBN: 9781321125924Subjects--Topical Terms:

3173567
Condensed matter physics.

Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates.
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100 1 $a Almeida Firmo, Ines. $3 3173916
245 1 0 $a Understanding unconventional superconductors: On the origin of Cooper pairing in Sr2RuO4 and the broken symmetries in the pseudogap regime of the cuprates.
300 $a 134 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-10(E), Section: B.
500 $a Adviser: J. C. Seamus Davis.
502 $a Thesis (Ph.D.)--Cornell University, 2014.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Unconventional superconductors provide, today, some of the most fundamental challenges in condensed-matter physics, besides their unimaginable potential for applications. Here, we will discuss two of these materials. Firstly, we will focus on Sr2RuO4, one of the most promising candidates to exhibit chiral p-wave superconductivity, analogously to a two-dimensional (2D) film of 3He-A. Some of the outstanding challenges regarding this multi-band superconductor remain, including the knowledge of which band(s) are primarily responsible for the appearance of superconductivity. Solving this issue will help us understand the symmetry of the pairing and, eventually, the pairing mechanism. We report scanning tunneling microscopy (STM) studies confirming a nodal superconducting gap structure and indicating that the quasi-one-dimensional (1D) bands are most important for superconductivity in Sr2RuO4. We suggest an experimental avenue to confirm this observation and determine the pairing symmetry beyond doubt. We then turn to a discussion of the hole-doped cuprate high-temperature superconductors, with a focus on their mysterious pseudogap regime and its Q = 0 and Q ≠ 0 electronic broken symmetries. Development of novel spectroscopic imaging STM (SI-STM) techniques allowed the quantitative measurement of such broken symmetries (also seen by other probes) and their inter-relations. We report on these novel techniques in detail, in particular Fourier phase determination of STM data, and study extensively the hole doping, p, dependence of the broken symmetries as well as the Fermi surface topology for Bi2Sr 2CaCu2O8+delta samples spanning the phase diagram between 0.06 ≤ p ≤ 0.23. We show that the electronic symmetry breaking tendencies weaken with increasing p and disappear close to pc = 0.19. Concomitantly, the coherent k-space topology undergoes an abrupt transition, from arcs to closed contours, at the same pc. These data reveal that the k-space topology transformation in the cuprates is linked intimately with the disappearance of the electronic symmetry breaking at a concealed critical point.
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650 4 $a Condensed matter physics. $3 3173567
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773 0 $t Dissertation Abstracts International $g 75-10B(E).
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