We show that the entropy per quantum vortex per layer in superconductors in external magnetic fields is bounded by the universal value k_B ln 2, which explains puzzling results of recent experiments on the Nernst effect.
@article{arxiv.2103.04310,
title = {Universal upper bound for the entropy of superconducting vortices and the Nernst effect},
author = {M. C. Diamantini and C. A. Trugenberger and V. Vinokur},
journal= {arXiv preprint arXiv:2103.04310},
year = {2022}
}