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Physics of Transition Metal Oxides
  • Language: en
  • Pages: 345

Physics of Transition Metal Oxides

The fact that magnetite (Fe304) was already known in the Greek era as a peculiar mineral is indicative of the long history of transition metal oxides as useful materials. The discovery of high-temperature superconductivity in 1986 has renewed interest in transition metal oxides. High-temperature su perconductors are all cuprates. Why is it? To answer to this question, we must understand the electronic states in the cuprates. Transition metal oxides are also familiar as magnets. They might be found stuck on the door of your kitchen refrigerator. Magnetic materials are valuable not only as magnets but as electronics materials. Manganites have received special attention recently because of thei...

Charge Dynamics in 122 Iron-Based Superconductors
  • Language: en
  • Pages: 139

Charge Dynamics in 122 Iron-Based Superconductors

This thesis combines highly accurate optical spectroscopy data on the recently discovered iron-based high-temperature superconductors with an incisive theoretical analysis. Three outstanding results are reported: (1) The superconductivity-induced modification of the far-infrared conductivity of an iron arsenide with minimal chemical disorder is quantitatively described by means of a strong-coupling theory for spin fluctuation mediated Cooper pairing. The formalism developed in this thesis also describes prior spectroscopic data on more disordered compounds. (2) The same materials exhibit a sharp superconductivity-induced anomaly for photon energies around 2.5 eV, two orders of magnitude larg...

Colossal Magnetoresistive Manganites
  • Language: en
  • Pages: 455

Colossal Magnetoresistive Manganites

The physics of transition metal oxides has become a central topic of interest to condensed-matter scientists ever since high temperature superconductivity was discovered in hole-doped cuprates with perovskite-like structures. Although the renewed interest in hole-doped perovskite manganites following the discovery of their colossal magnetoresistance (CMR) properties, began in 1993 about a decade after the discovery of high temperature superconductivity, their first investigation started as early as 1950 and basic theoretical ideas were developed during 1951-1960. Experience in sample preparation and characterization, and in growth of single crystals and epitaxial thin films, gained during th...

Electron-Phonon Interaction in Conventional and Unconventional Superconductors
  • Language: en
  • Pages: 109

Electron-Phonon Interaction in Conventional and Unconventional Superconductors

The problem of conventional, low-temperature superconductivity has been regarded as solved since the seminal work of Bardeen, Cooper, and Schrieffer (BCS) more than 50 years ago. However, the theory does not allow accurate predictions of some of the most fundamental properties of a superconductor, including the superconducting energy gap on the Fermi surface. This thesis describes the development and scientific implementation of a new experimental method that puts this old problem into an entirely new light. The nominee has made major contributions to the development and implementation of a new experimental method that enhances the resolution of spectroscopic experiments on dispersive lattic...

Interaction of Superconductivity and Ferromagnetism in YBCO-LCMO Heterostructures
  • Language: en
  • Pages: 166
Uniaxial Pressure Study of Charge Density Waves in a High-T꜀ Cuprate Superconductor
  • Language: en
  • Pages: 119

Uniaxial Pressure Study of Charge Density Waves in a High-T꜀ Cuprate Superconductor

This book presents comprehensive studies of charge density waves (CDW) in a high-Tc cuprate superconductor using x-ray scattering techniques under uniaxial pressure. Specifically, the work addresses inelastic x-ray scattering studies under uniaxial pressure performed on the underdoped cuprate YBa2Cu3O6.67(p=0.12, Tc=65K) with incoming photon energy in the resonant (E=931.3 eV, Cu-L3 edge) and non-resonant conditions (E=17.794 keV). This is a completely new approach to the investigation of charge density waves. It revealed new features of charge density waves in cuprates, whose properties had previously been inaccessible..

Physics of Spin-Orbit-Coupled Oxides
  • Language: en
  • Pages: 202

Physics of Spin-Orbit-Coupled Oxides

This book reviews recent experimental and theoretical evidence that the physical and structural properties of transition metal oxides may decisively be influenced by strong spin-orbit interactions that compete with comparable Coulomb, magnetic exchange, and crystalline electric field interactions.

Topological Phases of Matter
  • Language: en
  • Pages: 393

Topological Phases of Matter

This important graduate level text unites the physical mechanisms behind the phenomena of topological matter within a theoretical framework.

Topological Insulators
  • Language: en
  • Pages: 39

Topological Insulators

The discovery of the rich topological structures of electronic states in solids has opened up many interesting possibilities. The “twist” of the wavefunctions in momentum space, which is characterized by topological invariants, leads to the robust edge or surface states. The electron fractionalization associated with these topological states brings about the novel physics such as absence of localization, topological magneto-electric effect, and Majorana fermions. Here we describe the principles and some concrete examples of the theoretical design of the topological materials and their functions based on these recent developments.

Compound Systems in Nonextensive Statistical Mechanics and Manganites
  • Language: en
  • Pages: 155

Compound Systems in Nonextensive Statistical Mechanics and Manganites

This book presents insights into manganese oxides, which are materials with important technological applications such as magnetic refrigeration and magnetic sensors. It provides many mathematical proofs carried out in a didactic and elegant way; some of them use, for example, the method of mathematical induction. The book will be of interest to both researchers of physical sciences and the general reader interested in the subject.