Angle-Resolved Photoemission Spectroscopy Study of Spin Fluctuations in the Cuprate Superconductors

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Francisco Restrepo

Angle-Resolved Photoemission Spectroscopy Study of Spin Fluctuations in the Cuprate Superconductors

Francisco Restrepo

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English

Springer International Publishing AG
15 September 2023

Series: Springer Theses

This thesis makes significant advances towards an understanding of superconductivity in the cuprate family of unconventional, high-temperature superconductors. Even though the high-temperature superconductors were discovered over 35 years ago, there is not yet a general consensus on an acceptable theory of superconductivity in these materials. One of the early proposals suggested that collective magnetic excitations of the conduction electrons could lead them to form pairs, which in turn condense to form the superconducting state at a critical temperature Tc. Quantitative calculations of Tc using experimental data were, however, not available to verify the applicability of this magnetic mechanism. In this thesis, the author constructed an angle-resolved photoemission apparatus that could provide sufficiently accurate data of the electronic excitation spectra of samples in the normal state, data which was furthermore unusually devoid of any surface contamination. The author also appliedthe Bethe-Salpeter method to his uncommonly pristine and precise normal state data, and was able to predict the approximate superconducting transition temperatures of different samples. This rare combination of experiment with sophisticated theoretical calculations leads to the conclusion that antiferromagnetic correlations are a viable candidate for the pairing interaction in the cuprate superconductors.

By: Francisco Restrepo
Imprint: Springer International Publishing AG
Country of Publication: Switzerland
Edition: 2022 ed.
Dimensions: Height: 235mm, Width: 155mm,
Weight: 196g
ISBN: 9783031109812
ISBN 10: 3031109813
Series: Springer Theses
Pages: 104
Publication Date: 15 September 2023
Audience: Professional and scholarly , Undergraduate
Format: Paperback
Publisher's Status: Active

Chapter 1. Introduction.- Chapter 2. Superconductivity and the cuprates.- Chapter 3. Angle-Resolved Photoemission Spectroscopy.- Chapter 4. Experimental Details.- Chapter 5. Results.- Chapter 6. Conclusions.

After graduating with a B.S. in physics from the University of Illinois at Chicago, Francisco Restrepo joined the group of professor Juan Carlos Campuzano at the same institution, following his interest in many-body physics, superconductivity, and angle-resolved photoemission. After obtaining his PhD, he joined the group of professor Utpal Chatterjee at the University of Virginia, where he continues to work on high-temperature superconductors and other strongly correlated materials.