Magnetic and Charge Fluctuations in High-$T_c$ Superconductors

H. A. Mook; F. Dogan; and B. C. Chakoumakos

arXiv:cond-mat/9811100·cond-mat.supr-con·May 23, 2007

Magnetic and Charge Fluctuations in High-$T_c$ Superconductors

H. A. Mook, F. Dogan, and B. C. Chakoumakos

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TL;DR

This paper investigates spin and charge fluctuations in high-temperature superconductors YBa2Cu3O7-x and Bi2Sr2CaCu2O8 using neutron scattering, revealing incommensurate and commensurate excitations linked to lattice dynamics.

Contribution

It provides new experimental evidence of both spin and charge fluctuations and their relation to lattice dynamics in high-Tc superconductors.

Findings

01

Evidence for incommensurate spin fluctuations.

02

Detection of a commensurate resonance excitation.

03

Charge fluctuations linked to incommensurate lattice structure.

Abstract

Neutron scattering has been used to study the spin fluctuations in the YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ and Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8}$ materials. Evidence is found for both incommensurate fluctuations and a commensurate resonance excitation. Measurements on the lattice dynamics for YBa $_{2}$ Cu $_{3}$ O $_{6.6}$ show incommensurate structure that appears to stem from charge fluctuations that are associated with the spin fluctuations.

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Taxonomy

TopicsPhysics of Superconductivity and Magnetism · Scientific Research and Discoveries