Stable Existence of Phase IV inside Phase II under Pressure in Ce$_{0.8}$La$_{0.2}$B$_{6}$

TL;DR

This study demonstrates that applying pressure above approximately 1.1 GPa stabilizes phase IV within phase II in Ce$_{0.8}$La$_{0.2}$B$_{6}$, revealing complex phase stability influenced by pressure.

Contribution

It provides experimental evidence of phase IV's stable coexistence inside phase II under pressure, challenging mean-field theoretical models.

Findings

Phase IV exists stably inside phase II above 1.1 GPa.

Pressure enhances the stability of phase II over phases III and IV.

Mean-field calculations struggle to reproduce the observed phase stability.

Abstract

We investigate the pressure effect of the electrical resistivity and magnetization of Ce$_{0.8}$La$_{0.2}$B$_{6}$. The situation in which phase IV stably exists inside phase II at H=0 T could be realized by applying a pressure above $P\sim 1.1$ GPa. This originates from the fact that the stability of phase II under pressure is larger than those of phases IV and III. The results seem to be difficult to reproduce by taking the four interactions of $\Gamma_{\mathrm{5u}}$-type AFO, $O_{xy}$-type AFQ, $T_{xyz}$-type AFO, and AF exchange into account within a mean-field calculation framework.