Fate of Pomeranchuk effect in ultrahigh magnetic fields
Abstract
The Pomeranchuk effect is a counterintuitive phenomenon where liquid helium-3 (3He) solidifies under specific pressures, not when cooled, but when heated. This behaviour originates from the magnetic entropy of nuclear spins, suggesting a magnetic field should influence it. However, its detailed response to magnetic fields remains elusive due to the small nuclear magneton of 3He and lack of analogous fermion systems. Here, we show that an electron system also exhibit the Pomeranchuk effect, where the Fermi liquid state solidifies in a high magnetic field, unlike conventional electron systems where a field melts an electron solid into a metal. Remarkably, the electron system displays a reentrant liquid state in ultrahigh fields. These responses are explained by changes in magnetic entropy and magnetisation, extending the underlying physics to 3He. Our findings clarify magnetic-field impact on the Pomeranchuk effect and open avenues for magnetic control of chemical interactions.
Keywords
Cite
@article{arxiv.2512.23254,
title = {Fate of Pomeranchuk effect in ultrahigh magnetic fields},
author = {Naofumi Matsuyama and So Yokomori and Toshihiro Nomura and Yuto Ishii and Hiroaki Hayashi and Hajime Ishikawa and Kazuki Matsui and Hatsumi Mori and Koichi Kindo and Yasuhiro H. Matsuda and Shusaku Imajo},
journal= {arXiv preprint arXiv:2512.23254},
year = {2025}
}