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Study Of High Temperature Superconductivity In Feas Based Superconductors By Angle Resolved Photoemission Spectroscopy
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Book Synopsis Study of High-temperature Superconductivity in FeAs-based Superconductors by Angle-resolved Photoemission Spectroscopy by : Rolf Szedlak
Download or read book Study of High-temperature Superconductivity in FeAs-based Superconductors by Angle-resolved Photoemission Spectroscopy written by Rolf Szedlak and published by . This book was released on 2011 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoemission Spectroscopy on High Temperature Superconductor by : Wentao Zhang
Download or read book Photoemission Spectroscopy on High Temperature Superconductor written by Wentao Zhang and published by Springer Science & Business Media. This book was released on 2012-08-22 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book mainly focuses on the study of the high-temperature superconductor Bi2Sr2CaCu2O8 by vacuum, ultra-violet, laser-based, angle-resolved photoemission spectroscopy (ARPES). A new form of electron coupling has been identified in Bi2212, which occurs in the superconducting state. For the first time, the Bogoliubov quasiparticle dispersion with a clear band back-bending has been observed with two peaks in the momentum distribution curve in the superconducting state at a low temperature. Readers will find useful information about the technique of angle-resolved photoemission and the study of high-temperature superconductors using this technique. Dr. Wentao Zhang received his PhD from the Institute of Physics at the Chinese Academy of Sciences.
Book Synopsis Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors by : Junfeng He
Download or read book Angle-Resolved Photoemission Spectroscopy on High-Temperature Superconductors written by Junfeng He and published by Springer. This book was released on 2016-06-21 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book mainly focuses on the study of the high-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi2212) and single-layer FeSe film grown on SrTiO3 (STO) substrate by means of angle-resolved photoemission spectroscopy (ARPES). It provides the first electronic evidence for the origin of the anomalous high-temperature superconductivity in single-layer FeSe grown on SrTiO3 substrate. Two coexisted sharp-mode couplings have been identified in superconducting Bi2212. The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system. A phase diagram and electronic indication of high Tc and insulator to superconductor crossover have been established in the single-layer FeSe/STO films. Readers will find essential information on the techniques used and interesting physical phenomena observed by ARPES.
Book Synopsis Angle-Resolved Photoemission Spectroscopy Study of Spin Fluctuations in the Cuprate Superconductors by : Francisco Restrepo
Download or read book Angle-Resolved Photoemission Spectroscopy Study of Spin Fluctuations in the Cuprate Superconductors written by Francisco Restrepo and published by Springer Nature. This book was released on 2022-09-13 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 applied the 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.
Book Synopsis Photoemission Studies of High-Temperature Superconductors by : David W. Lynch
Download or read book Photoemission Studies of High-Temperature Superconductors written by David W. Lynch and published by Cambridge University Press. This book was released on 1999-05-28 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes important topics in high-temperature superconductivity; for graduate students and researchers.
Book Synopsis Study of High Temperature Superconductors with Angle-resolved Photoemission Spectroscopy by : Pavel Valere̓vich Bogdanov
Download or read book Study of High Temperature Superconductors with Angle-resolved Photoemission Spectroscopy written by Pavel Valere̓vich Bogdanov and published by . This book was released on 2002 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of High Temperature Superconductors with Angle-Resolved Photoemission Spectroscopy by :
Download or read book Study of High Temperature Superconductors with Angle-Resolved Photoemission Spectroscopy written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Angle Resolved Photoemission Spectroscopy (ARPES) recently emerged as a powerful tool for the study of highly correlated materials. This thesis describes the new generation of ARPES experiment, based on the third generation synchrotron radiation source and utilizing very high resolution electron energy and momentum analyzer. This new setup is used to study the physics of high temperature superconductors. New results on the Fermi surfaces, dispersions, scattering rate and superconducting gap in high temperature superconductors are presented.
Book Synopsis Advances in Theoretical and Experimental Research of High Tc Superconductivity by : Han Rushan
Download or read book Advances in Theoretical and Experimental Research of High Tc Superconductivity written by Han Rushan and published by World Scientific Publishing Company. This book was released on 2019 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers working at the frontier of high-Tc Superconductors have reviewed the development in this area in the past 20 years. Both experimental and theoretical aspects have been covered. New directions and possible theoretical models were suggested. The contributors of this book are from China Center of Advanced Science and Technology (CCAST); Institute of Physics Chinese Academy of Sciences (CAS); National Lab for Superconductivity, Institute of Physics, CAS; School of Physics, Peking University and Center of Advanced Study Tsinghua University. This volume will be a useful guide to those who are working in the field.
Book Synopsis High-resolution Photoemission Study of the High Temperature Superconductors by : Yeukuang Hwu
Download or read book High-resolution Photoemission Study of the High Temperature Superconductors written by Yeukuang Hwu and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Angle Resolved Photoemission Spectroscopy Study of High Temperature Superconductors by : Utpal Chatterjee
Download or read book Angle Resolved Photoemission Spectroscopy Study of High Temperature Superconductors written by Utpal Chatterjee and published by . This book was released on 2007 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of High Temperature Superconductors with Angle-resolved Photoemission Spectroscopy by : Pavel Valer'evich Bogdanov
Download or read book Study of High Temperature Superconductors with Angle-resolved Photoemission Spectroscopy written by Pavel Valer'evich Bogdanov and published by . This book was released on 2001 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Models and Phenomenology for Conventional and High-Temperature Superconductivity by : Società italiana di fisica
Download or read book Models and Phenomenology for Conventional and High-Temperature Superconductivity written by Società italiana di fisica and published by IOS Press. This book was released on 1998 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for microscopic models to explain the many superconducting substances has introduced seminal concepts and techniques in many-body physics and in statistical mechanics. The complexity of the high-temperature superconductors has required a remarkable refinement of experimental techniques in order to allow a reliable characterization of the samples, and is partly the reason why so many different microscopic models have so far been proposed. This Enrico Fermi Course on Superconductivity was provided an up-to date presentation of selected experimental and theoretical theories on the (so called) conventional superconductivity and on the high temperature superconductivity. The attention was focused on those reliable measurements which are expected to provide the theory with key constraints, viz: Raman and Infrared Spectroscopy, Nuclear Spin Resonance, Angular Resolved Photoemission Spectroscopy, transport measurements, Josephson effect. The lectures devoted to the overview of the BCS theory and to the discussion of minimal models and of the crossover from BCS to Bose-Einstein condensation may be particularly useful. The remaining part of the program was shared between phonon and non-phonon based mechanisms. On the one hand, special emphasis has been devoted to the breakdown of the Migdal theorem and to polaronic theories. On the other, the book contains an overview of strongly correlated electron theories, including magnetic interactions. A survey of the physics of vortices completes the theoretical part of the lectures.
Book Synopsis Low Energy Excitations in Cuprate High Temperature Superconductors by : Inna Vishik
Download or read book Low Energy Excitations in Cuprate High Temperature Superconductors written by Inna Vishik and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism of superconductivity in the cuprate high temperature superconductors is an enduring problem in condensed matter physics, and a detailed experimental phenomenology is a crucial starting point for microscopic understanding. Angle-resolved photoemission spectroscopy (ARPES) measures electronic structure in momentum-space. Low-energy excitations in the cuprates, including the superconducting gap, are known to be anisotropic in momentum space, so the momentum resolution afforded by ARPES is key to understanding the physics and uncovering the mechanism. In this dissertation, I present experiments which pursue the cuprate superconductivity problem from several angles: understanding electron-boson coupling which may be involved in mediating superconductivity (Chapters 6 and 7 and Appendix B), understanding the momentum-space structure of the normal state pseudogap (Chapter 5 and Appendix A), understanding how superconductivity coexists with the pseudogap and other phases (Chapters 3 and 4). Much of this work took advantage of a recent development in ARPES technology, using a UV laser as a light source, which allows experiments to be performed with superior energy and momentum resolution. These experiments highlight the wealth of information that is available in ARPES data, including dispersions, scattering rates, and spectral gaps, and they demonstrate the importance of exploring these variables comprehensively as a function of temperature, doping, and momentum.
Book Synopsis High Energy Resolution Angle-resolved Photoemission Studies of Electronic Properties of Bi-based High Temperature Superconductors by : Jian Ma
Download or read book High Energy Resolution Angle-resolved Photoemission Studies of Electronic Properties of Bi-based High Temperature Superconductors written by Jian Ma and published by . This book was released on 1995 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combined Angle-resolved Photoemission and $in~situ$ Transport Studies of Superconductivity in FeSe/SrTiO$_3$ Thin Films by : Brendan David Faeth
Download or read book Combined Angle-resolved Photoemission and $in~situ$ Transport Studies of Superconductivity in FeSe/SrTiO$_3$ Thin Films written by Brendan David Faeth and published by . This book was released on 2020 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In bulk form the prototypical iron based superconductor FeSe has a humble \Tc of only 8~K. When grown on the ubiquitous perovskite SrTiO$_3$, however, the interface appears to exhibit an enormous superconducting enhancement of up to $\approx$60~K, in excess of any other known Fe based material in bulk. However, due to the challenges inherent to the study of air-sensitive interfacial superconductors, the nature and origin of this enhancement effect remain mysterious. A complete understanding of the underlying enhancement mechanism in this novel system could open the door to engineering new interfacial superconductors with higher~$T_c$'s. In this dissertation, we use the synergistic combination of molecular beam epitaxy (MBE), angle-resolved photoemission spectroscopy (ARPES), and \insitu resistivity to exhaustively explore the novel superconducting behavior of \FeSeSTO ultra-thin films. In doing so, we reveal an unprecedentedly large pseudogap regime in single unit cell thick (1-UC) \FeSeSTO where the spectroscopic gap persists at elevated temperatures \smash{(\Tgap $\approx$ 70 K)} well above the onset of zero resistance \smash{(\Tzero$\approx$ 30 K)}. Furthermore, by systematically comparing transport behavior across many samples, we observe distinct signatures of two-dimensional (2D) superconducting phase fluctuations, revealing a mixed vortex state hosting incoherent Cooper pairs which ultimately drives the pseudogap observed by ARPES at elevated temperatures. This naturally explains the unconventional gap behavior and reconciles many previously mysterious longstanding discrepancies between transport and spectroscopic behaviors in 1-UC \FeSeSTOns. Building on this result, we exploit the synthesis power of MBE to study how superconductivity at the FeSe/SrTiO$_3$ interface responds to the additional growth of extra layers, using \insitu transport measurements to gain access to the buried interface. In contrast to previous reports, we show that the transport \Tc of the interfacial monolayer is robust and largely unaffected by additional FeSe layers, and that the earlier reported reduction of \Tc in thicker films can be explained by parallel transport channels in the presence of a broad, 2D transition. This places important constraints on the mechanism of the \Tc enhancement. In multi-layer samples, we successfully measure a macroscopic zero resistance state induced via alkali surface-doping, and map out the entire doping-dependent superconducting dome in the absence of interfacial effects. Surprisingly, we find that the onset of zero resistance for optimally surface-doped samples occurs at ($\approx$ 28 K) - nearly identical to the best interfacial films ($\approx$ 30 K). Finally, we performed comprehensive photon energy dependent measurements of the enigmatic 1-UC \FeSeSTO replica band features using synchrotron ARPES. Studying the evolution of the replica band at $M$ with increasing photon energy, we find conclusive evidence that the interfacial replica band in \FeSeSTO originates from an intrinsic electron-phonon coupling effect. This confirms that interfacial phonon coupling at atomic interfaces can produce nontrivial modifications to the underlying bandstructure, a finding with widespread implications. Taken together, our results demonstrate the critical role that limited dimensionality plays in the emergence of superconductivity in FeSe/SrTiO$_3$, and in interfacial high-$T_c$ systems more generally. Based on this understanding, we suggest several promising pathways forward for further research exploiting interfacial enhancement mechanisms of superconductivity.
Book Synopsis The Study of Many Body Physics in High Temperature Superconductors Using Angle Resolved Photoemission Spectroscopy by : Adam Kaminski
Download or read book The Study of Many Body Physics in High Temperature Superconductors Using Angle Resolved Photoemission Spectroscopy written by Adam Kaminski and published by . This book was released on 2001 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electronic Phases in Iron-based High Temperature Superconductors by : Ming Yi
Download or read book Electronic Phases in Iron-based High Temperature Superconductors written by Ming Yi and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High temperature superconductivity (HTSC) is a topic that has fascinated physicists for decades not only due to the intricate underlying properties of nature that it reflects, but also to the challenging nature of the physics problem it presents. For over two decades, condensed matter physicists have wrestled the cuprate problem as the only material family of HTSC. The discovery of the iron-based superconductors (FeSCs) in 2008 brought a fresh perspective to the field, as now comparison and contrast can be made between the two families in the hope of identifying the bare minimal ingredients for the HTSC phenomenon. In this regard, one of the key findings early on was that the FeSC share a phase diagram that is arguably similar to the cuprates, that is, the parent compound is a magnetically ordered state, which is suppressed with doping before superconductivity emerges in a dome-like fashion. In this dissertation, I approach the FeSC problem from two major perspectives using the technique of angle-resolved photoemission spectroscopy: i) understanding the electronic correlation strength in the normal state, and ii) understanding the nature of the electronic phases in proximity to superconductivity. Through a comprehensive and systematic study of many FeSC families, I find that FeSCs are not Fermi liquids, nor are they strongly correlated like the doped Mott insulators of the cuprates, but rather moderately correlated, for which theoretical models of both itinerant and localized components are necessary for capturing the essential physics. For the second perspective, I find direct evidence for an electronic nematic phase bounded by the structural transition and Fermi surface reconstruction associated with the spin density wave order. Furthermore, I present direct spectroscopic evidence that these two orders compete with superconductivity in an underdoped FeSC. These results are similar to the competing nature of the pseudogap to superoconductivity in the cuprates, suggesting that phase competition may play a non-trivial role for HTSC.
