scholarly journals From Magnons to the Resonance Peak: Spin Dynamics in High-TC Superconducting Cuprates by Inelastic Neutron Scattering

2006 ◽  
pp. 349-371 ◽  
Author(s):  
Philippe Bourges
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
High Tc ◽  
Superconducting Cuprates

THEORY FOR INELASTIC NEUTRON SCATTERING IN HIGH-Tc SUPERCONDUCTORS: DOPING AND TEMPERATURE DEPENDENCE OF TWO CHARACTERISTIC FREQUENCIES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3451-3456
Author(s):  
I. EREMIN ◽  
D. MANSKE ◽  
C. JOAS ◽  
K. H. BENNEMANN
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Spin Fluctuations ◽  
High Tc Superconductors ◽  
High Tc ◽  
Doping Dependence ◽  
Antiferromagnetic Spin ◽  
Coherence Effect

Assuming the exchange of antiferromagnetic spin fluctuations as the Cooper pairing mechanism we calculate the doping dependence of the resonance peak seen in inelastic neutron scattering and the magnetic coherence effect. We find that the resonance peak in the magnetic susceptibility, Im χ(q,ω), appears only in the superconducting state at ωres and that it scales with Tc. Magnetic coherence is a result of an interplay between a d-wave order parameter and the kinematic gap ω0. We analyze the structure of Im χ below Tc, the doping dependence of ω0 and ωres, and the consequences for the optical conductivity.

INELASTIC NEUTRON SCATTERING IN THE ANHARMONIC MODEL OF HIGH-Tc SUPERCONDUCTORS

1990 ◽  
Vol 04 (05) ◽  
pp. 341-346 ◽  
Author(s):  
N. M. PLAKIDA ◽  
V. I. AKSENOV ◽  
S. L. DRECHSLER ◽  
T. GALBAATAR ◽  
S. STAMENKOVIC
Keyword(s):  
Neutron Scattering ◽  
Cross Sections ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Spin Model ◽  
Anomalous Temperature Dependence ◽  
High Tc Superconductors ◽  
Anomalous Temperature ◽  
High Tc ◽  
Oxygen Ions

The inelastic neutron scattering on highly anharmonic vibrations of oxygen ions in high-T c superconductors is studied in the framework of a pseudo-spin model. By evaluating the coherent and incoherent cross-sections, it is found that the scattering intensity exhibits an anomalous temperature dependence.

scholarly journals Spin dynamics of molecular nanomagnets unravelled at atomic scale by four-dimensional inelastic neutron scattering

2012 ◽  
Vol 8 (12) ◽  
pp. 906-911 ◽  
Author(s):  
Michael L. Baker ◽  
Tatiana Guidi ◽  
Stefano Carretta ◽  
Jacques Ollivier ◽  
Hannu Mutka ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Atomic Scale ◽  
Molecular Nanomagnets

Spin Dynamics in the Metallic State of YBa2(Cu0.98 Zn0.02) 3O6+x

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3330-3334 ◽  
Author(s):  
Y. Sidis ◽  
P. Bourges ◽  
B. Hennion ◽  
R. Villeneuve ◽  
G. Collin ◽  
...  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Low Energy ◽  
Metallic State ◽  
Magnetic Fluctuations ◽  
Local Enhancement ◽  
Compound I ◽  
Nonmagnetic Impurities

Inelastic neutron scattering measurements have been carried out on a YBa2(Cu0.98-Zn0.02)3O 6+x single crystal in both underdoped (x = 0.7) and overdoped (x = 0.97) regimes. In the zinc substituted system, spin dynamics is drastically changed in respect to the pure compound: (i) the "resonance peak" almost vanishes, (ii) the spin gap is filled, (iii) new antiferromagnetic excitations are found at low energy. These new magnetic fluctuations, which persist in the normal state, account for a local enhancement of AF correlations around nonmagnetic impurities. Besides, it is worth emphasizing that features, not directly related to superconductivity, i.e., the contribution to the spin dynamics apart from the resonance peak and the "spin pseudo-gap" observed in the underdoped regime above T c , coexist with the new low energy magnetic fluctuations.

Inelastic neutron scattering study of the spin dynamics in the YBa2Cu3O6+χ system

1993 ◽  
Vol 192 (1-2) ◽  
pp. 109-121 ◽  
Author(s):  
J. Rossat-Mignod ◽  
L.P. Regnault ◽  
P. Bourges ◽  
P. Burlet ◽  
C. Vettier ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals Phonons, Lattice Instabilities and Superconductivity

1980 ◽  
Vol 33 (5) ◽  
pp. 861 ◽  
Author(s):  
Harold G Smith
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Superconducting Materials ◽  
High Tc Superconductors ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Relationship Of ◽  
The Relationship

The relationship of phonon anomalies and lattice instabilities to high Tc superconductivity is explored. Inelastic neutron scattering studies have revealed an intimate and dramatic relation between certain phonons and lattice transformations, real or incipient, for moderate to high Tc superconductors, which are minimal or nonexistent in very low Tc or nonsuperconductors. Experimentalevidence is presented for a wide variety of superconducting materials and possible theoretical explanations for their behaviour are discussed.

scholarly journals Silver route to cuprate analogs

2019 ◽  
Vol 116 (5) ◽  
pp. 1495-1500 ◽  
Author(s):  
Jakub Gawraczyński ◽  
Dominik Kurzydłowski ◽  
Russell A. Ewings ◽  
Subrahmanyam Bandaru ◽  
Wojciech Gadomski ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Parent Compound ◽  
Mott Insulator ◽  
Inelastic Neutron ◽  
Square Lattice ◽  
Antiferromagnetic Coupling ◽  
Superconducting Cuprates ◽  
Electronic Parameters

The parent compound of high-Tc superconducting cuprates is a unique Mott insulator consisting of layers of spin-12 ions forming a square lattice and with a record high in-plane antiferromagnetic coupling. Compounds with similar characteristics have long been searched for without success. Here, we use a combination of experimental and theoretical tools to show that commercial AgF2 is an excellent cuprate analog with remarkably similar electronic parameters to La2CuO4 but larger buckling of planes. Two-magnon Raman scattering and inelastic neutron scattering reveal a superexchange constant reaching 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the AgF2 planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.

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