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High-Temperature Superconductivity in Cuprates The Nonlinear Mechanism and Tunneling Measurements

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ISBN-10: 1402008104

ISBN-13: 9781402008108

Edition: 2002

Authors: Andrei Mourachkine

List price: $249.99
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Description:

The main purpose of the book is to present a description of the mechanism of high-temperature superconductivity and to discuss the physics of high-temperature superconductors, both entirely based on experimental facts. The pairing mechanism of this remarkable phenomenon is based on an anomaly found in tunneling (V) characteristics of some cuprates. By using the soliton theory, it is then shown that this anomaly is caused by pairs of quasi-one dimensional excitations - bisolitons - bound due to a moderately strong, nonlinear electron-phonon interaction. At the same time, analysis of experimental data unambiguously shows that magnetic (spin) fluctuations mediate the phase coherence in…    
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Book details

List price: $249.99
Copyright year: 2002
Publisher: Springer
Publication date: 7/31/2002
Binding: Hardcover
Pages: 318
Size: 6.25" wide x 9.50" long x 0.75" tall
Weight: 1.628
Language: English

Preface
Introduction
Superconductivity: a brief sketch
High-T[subscript c] superconductivity: a brief historical introduction
Superconducting materials
The BCS Model of Superconductivity in Metals
The BCS mechanism
Electron-electron attraction
Critical temperature
Strength of the electron-phonon interaction
The isotope effect
Energy gap
Coherence length
Penetration depth
Symmetry of the order parameter
Characteristics of the superconducting state
Type-I and type-II superconductors
Critical current
Phase stiffness
Josephson effects
Effect of impurities
High-frequency residual losses
Acoustic properties
Thermal properties
Tunneling
SIN tunneling
Density of states
SIS tunneling
The Josephson I[subscript c]R[subscript n] product
Andreev reflections
Tunneling techniques
Cuprates and Their Basic Properties
Structure
LSCO
YBCO
Bi2212
NCCO
Structural phase transitions
Crystal structure and T[subscript c]
Structural defects
Doping and charge distribution
Charge doping and T[subscript c]
Charge inhomogeneities
Superconducting properties
The isotope effect
Absence of the correlation between [Delta](0) and T[subscript c]
Effective mass anisotropy
Resistivity and the effect of magnetic field
Coherence length
Penetration depth and superfluid density
Electronic specific heat and the condensation energy
Effect of impurities
Critical magnetic fields and critical current J[subscript c]
Phase stiffness
Phase coherence along the c axis
Two energy scales: pairing and phase-coherence
Cooper pairs above T[subscript c]
Symmetry of the order parameter: s-wave vs d-wave
Phonons in cuprates
Magnetic properties
Stripe phase
Chains in YBCO
Acoustic measurements in cuprates
Effect of pressure
Normal-state properties
Pseudogap
Pseudogap temperature T*
Structural transitions above T[subscript c]
Magnetic ordering in the undoped region
Theory
Applications
Small-scale applications
Large-scale applications
A final remark
Cuprates: Anomaly in Tunneling Spectra
Tunneling measurements in Bi2212
Measurements below T[subscript c]
Measurements above T[subscript c]
Normalization procedure
Contribution from the superconducting condensate
Tunneling measurements in YBCO
Nonlinear Excitations: Solitons
Introduction
Russell's discovery
Korteweg-de Vries equation
Numerical simulations
Particle-like properties
Frenkel-Kontorova solitons
Topological solitons in a chain of pendulums
Different categories of solitons
The KdV solitons
The topological solitons
The envelope solitons
Solitons in real systems
Solitons in the superconducting state
Topological solitons in polyacetylene
Magnetic solitons
Self-trapped states: the Davydov soliton
Discrete breathers
Structural phase transitions
Tunneling and the soliton theory
Modern solitons
Neither a wave nor a particle
Evidence for Soliton-Like Excitations in Cuprates
Tunneling measurements in Bi2212
Underdoped Bi2212
Overdoped Bi2212
Ni-doped Bi2212
Two components in tunneling spectra
"Second-harmonic" humps
Bisoliton-solution fits
Single-soliton fit
Tunneling pseudogap
Tunneling measurements in YBCO
Acoustic measurements in LSCO
Nickelates and manganites
NMR measurements in La[subscript 2]NiO[subscript 4.17]
Tunneling measurements in La[subscript 1.4]Sr[subscript 1.6]Mn[subscript 2]O[subscript 7]
Bisoliton Model of High-T[subscript C] Superconductivity
The bisoliton model
Small density of doped charge carries
Large density of doped charge carries
The Coulomb repulsion
Stability of the bisolitons
Bisoliton superconductivity
The critical temperature
Superconductivity in cuprates
A concluding remark
The Bisoliton Model and Data
Main results of the bisoliton model
Phase coherence in cuprates
Pairing characteristics of cuprates
Polaron and bisoliton energy levels
The coupling parameter g
Doping dependence of g and the energy gap in Bi2212
Bisoliton mass
Coherence length
Tunneling characteristics
Phonon spectrum in Bi2212
Electron-doped NCCO
Concluding remarks
Key experiments for bisoliton superconductivity
The Mechanism of C-Axis Phase Coherence
Superconductivity and magnetism
Superconductivity and antiferromagnetism
Superconductivity and ferromagnetism
Magnetically-mediated superconductivity
Characteristic features
Layered compounds with magnetic correlations
Phase coherence in cuprates
Cuprates: two energy scales
Magnetic properties
Phase-coherence properties
Magnetic resonance peak
Tunneling assisted by spin excitations in Bi2212
Pr-doped YBCO
Theory
Concluding remarks
The Mechanism of High-T[subscript C] Superconductivity
A general description of the mechanism
Important elements of high-T[subscript c] superconductivity
Pairing mechanism
Phase diagram
Phase-coherence mechanism
Symmetry of the order parameters
In-plane coherence lengths
Effect of impurities
Key experiments
Future theory
Interpretation of some experiments
Interesting facts
Organic and heavy-fermion superconductors
High-T[subscript C] Superconductivity Could be Predicted
Back in 1985
A-15 superconductors
Chevrel phases
Cuprates
Principles of Superconductivity
Different Types of Superconductivity
Pairing mechanisms
Phase-coherence mechanisms
Different combinations
Superconductivity in Two Dimensions
Room-Temperature Superconductivity
Analysis of Tunneling Measurements in Cuprates
Introduction
Excitation spectrum of a Bose-Einstein condensate
Two energy gaps in cuprates
Bi2212
YBCO and Tl2201
Phase diagram
Two energy gaps in magnetic field
Pseudogap
Pairing gap and pseudogap
Two contributions to tunneling spectra
SIN and SIS junctions of cuprates
Subgap
Temperature dependence
Superconducting state
Normal state
The Josephson product
Zero-bias conductance peak
Zn and Ni doping in Bi2212
Vortex-core states
NCCO
Symmetry of the order parameters
Two energy scales
Pseudogap
SIS-junction fit
Bisoliton fit
Height of quasiparticle peaks
Bisoliton fit in numbers
SIS-junction fit
References
Index