Year: 1994
Type: article
Abstract: Thermal motion of the flux lines (FL's) gives rise to fluctuating magnetic fields. These dynamic fields couple to the nuclei in the sample and relax the nuclear spins. We provide a theoretical description of the nuclear spin-lattice relaxation process due to the fluctuating FL's in clean type-II superconductors. At low fields, the calculated longitudinal relaxation rate ${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$ is enormously enhanced at temperatures just below ${\mathit{T}}_{\mathit{c}}$. At intermediate fields, the resulting ${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$ exhibits a peak structure as a function of temperature, which is eventually suppressed as the field is increased. The vibrational modes that have components propagating along the FL's play an essential role in the ${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$ process.
Source: Physical Review Letters
Authors: Lei Xing, Yia-Chung Chang
Institution: University of Illinois Urbana-Champaign
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2315550709