Vortex Transport Entropy in cuprate superconductors and Boltzmann Constant

TL;DR

This paper investigates the vortex transport entropy in cuprate superconductors and finds it to be close to the Boltzmann constant, providing insights into vortex dynamics in the mixed state.

Contribution

It demonstrates that the vortex transport entropy per CuO$_2$ double layer is approximately equal to the Boltzmann constant in certain cuprate superconductors.

Findings

Vortex transport entropy is close to Boltzmann constant.

Entropy measured at maximum Nernst or Ettingshausen signal.

Results apply to specific cuprate epitaxial films.

Abstract

The vortex transport entropy in the mixed state of the cuprate superconductors YBa$_2$Cu$_3$O$_{7-{\delta}}$ and Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ at the maximum Nernst or Ettingshausen signal below $T_c$ is discussed. The vortex transport entropy per CuO$_2$ double layer in the cuprate epitaxial films is found to be close to the Boltzmann constant.