Quasiparticle heat transport in the mixed state of high $T_c$ superconductors

TL;DR

This paper provides a microscopic explanation for the magnetic field dependence of thermal conductivity in cuprate superconductors, linking quasiparticle behavior around vortex cores to observed thermal transport anomalies.

Contribution

It introduces a microscopic calculation of thermal conductivity in the mixed state, revealing how quasiparticle depletion by magnetic field explains the anomalous core behavior.

Findings

Thermal conductivity decreases with magnetic field due to quasiparticle depletion.

The model explains the 'anomalous core' phenomenon in underdoped cuprates.

$ppa(H,T)$ serves as a probe for quasiparticle structures in the mixed state.

Abstract

The field dependence of low-temperature thermal conductivity $\kappa(H)$ observed on cuprates is explained by calculating $\kappa(H)$ microscopically. The heat current carried by low-lying quasiparticles around a vortex core decreases with $H$ due to its depletion by the $H$-induced moment centered at a core for an underdoped case. This leads to a common and consistent picture on an ``anomalous core''. $\kappa(H,T)$ is found to be a useful tool for probing quasiparticle structures in the mixed state in general.