Alternative crystal field parameters for rare-earth ions obtained from various techniques: IV. Comparative analysis of crystal field parameters obtained from inelastic neutron scattering and related studies of RE ions (RE=Er3+, Ho3+, Nd3+, Pr3+) in REBa2Cu3O7−δ high-Tc superconductors

2012 ◽  
Vol 540 ◽  
pp. 279-289 ◽  
Author(s):  
Czesław Rudowicz ◽  
Monika Lewandowska
Keyword(s):  
Rare Earth ◽  
Comparative Analysis ◽  
Neutron Scattering ◽  
Crystal Field ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Rare Earth Ions ◽  
High Tc Superconductors ◽  
High Tc ◽  
Crystal Field Parameters

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 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.

Crystal field effects on the inelastic neutron scattering from heavy rare earth metals in the paramagnetic phase

1968 ◽  
Vol 46 (12) ◽  
pp. 1499-1501 ◽  
Author(s):  
A. D. B. Woods
Keyword(s):  
Rare Earth ◽  
Neutron Scattering ◽  
Crystal Field ◽  
Inelastic Neutron Scattering ◽  
Order Term ◽  
Rare Earth Metals ◽  
Inelastic Neutron ◽  
Paramagnetic Phase ◽  
Heavy Rare Earth ◽  
Hexagonal Close Packed

Expressions which arise in the interpretation of inelastic neutron scattering from hexagonal close packed rare earth metals in the paramagnetic phase are presented and discussed. It is concluded that the fourth- and sixth-order terms which occur in the Hamiltonian describing the crystal field can, in some cases, be as important as the leading second-order term.

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.

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