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Evolution of the excitation spectrum...

Pushp, Aakash.

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Evolution of the excitation spectrum of cuprate superconductors with doping and temperature.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Evolution of the excitation spectrum of cuprate superconductors with doping and temperature./
Author:	Pushp, Aakash.
Description:	159 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .
Contained By:	Dissertation Abstracts International71-12B.
Subject:	Physics, Low Temperature. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3431036
ISBN:	9781124314686

Evolution of the excitation spectrum of cuprate superconductors with doping and temperature.
Pushp, Aakash.

Evolution of the excitation spectrum of cuprate superconductors with doping and temperature. - 159 p.

Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010.

Understanding the mechanism by which d-wave superconductivity in the cuprates emerges and is optimized by doping a Mott insulator is one of the major outstanding problems in physics. A key unresolved question in this field is how the strength of electron pairing evolves as a function of doping and temperature and whether pairing strength and the T c of the sample are related, as they are in simple BCS superconductors. To address these questions, we have developed several new experimental techniques with the scanning tunneling microscope to measure the excitation spectra in the cuprates on the atomic scale as a function of doping and temperature. In this thesis, we will describe these techniques as well as a series of new experiments that reveal a surprisingly simple picture of how superconductivity in the cuprates is optimized. We will first show that over a wide range of doping (optimal to overdoped), the pairing gaps in these systems nucleate in nanoscale regions at temperatures above Tc unlike in the conventional superconductors where the superconducting order parameter sets in at the bulk Tc. These regions proliferate as the temperature is lowered, resulting in a spatial distribution of gap sizes in the superconducting state. Analysis of our data shows no correlation between the inhomogeneous pairing gaps and either the energy scale of the boson modes or the strength of the local electron-boson coupling as measured by the local excitation spectra. This spatially inhomogeneous pairing strength is in fact determined by the unusual electronic excitations of the normal state, suggesting that strong electron-electron interactions rather than low-energy (<0.1 eV) electron-boson interactions are responsible for superconductivity in the cuprates. In contrast, the excitation spectra in the underdoped samples show multiple features that can't be fit to a simple d-wave order parameter. However, these spectra show a universal low energy excitation spectrum, indicating that the pairing strength near the nodes is independent of doping. The transition temperature Tc in this doping regime correlates with the fraction of the Fermi surface over which the samples exhibit the universal d-wave spectrum. Optimal Tc is achieved when all parts of the Fermi surface follow this universal behavior. Increasing temperature above Tc turns the universal spectrum into an arc of gapless excitations, while overdoping breaks down the universal nodal behavior.

ISBN: 9781124314686Subjects--Topical Terms:

1669075
Physics, Low Temperature.

Evolution of the excitation spectrum of cuprate superconductors with doping and temperature.
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020 $a 9781124314686
035 $a (UMI)AAI3431036
035 $a AAI3431036
040 $a UMI $c UMI
100 1 $a Pushp, Aakash. $3 1671143
245 1 0 $a Evolution of the excitation spectrum of cuprate superconductors with doping and temperature.
300 $a 159 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-12, Section: B, page: .
500 $a Adviser: Dale J. Van Harlingen.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010.
520 $a Understanding the mechanism by which d-wave superconductivity in the cuprates emerges and is optimized by doping a Mott insulator is one of the major outstanding problems in physics. A key unresolved question in this field is how the strength of electron pairing evolves as a function of doping and temperature and whether pairing strength and the T c of the sample are related, as they are in simple BCS superconductors. To address these questions, we have developed several new experimental techniques with the scanning tunneling microscope to measure the excitation spectra in the cuprates on the atomic scale as a function of doping and temperature. In this thesis, we will describe these techniques as well as a series of new experiments that reveal a surprisingly simple picture of how superconductivity in the cuprates is optimized. We will first show that over a wide range of doping (optimal to overdoped), the pairing gaps in these systems nucleate in nanoscale regions at temperatures above Tc unlike in the conventional superconductors where the superconducting order parameter sets in at the bulk Tc. These regions proliferate as the temperature is lowered, resulting in a spatial distribution of gap sizes in the superconducting state. Analysis of our data shows no correlation between the inhomogeneous pairing gaps and either the energy scale of the boson modes or the strength of the local electron-boson coupling as measured by the local excitation spectra. This spatially inhomogeneous pairing strength is in fact determined by the unusual electronic excitations of the normal state, suggesting that strong electron-electron interactions rather than low-energy (<0.1 eV) electron-boson interactions are responsible for superconductivity in the cuprates. In contrast, the excitation spectra in the underdoped samples show multiple features that can't be fit to a simple d-wave order parameter. However, these spectra show a universal low energy excitation spectrum, indicating that the pairing strength near the nodes is independent of doping. The transition temperature Tc in this doping regime correlates with the fraction of the Fermi surface over which the samples exhibit the universal d-wave spectrum. Optimal Tc is achieved when all parts of the Fermi surface follow this universal behavior. Increasing temperature above Tc turns the universal spectrum into an arc of gapless excitations, while overdoping breaks down the universal nodal behavior.
590 $a School code: 0090.
650 4 $a Physics, Low Temperature. $3 1669075
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0598
690 $a 0611
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 71-12B.
790 1 0 $a Van Harlingen, Dale J., $e advisor
790 $a 0090
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3431036