Comment on "Theory of Unconventional Spin Density Wave: A Possible Mechanism of the Micromagnetism in U-based Heavy Fermion Compounds"

TL;DR

This paper critiques a recent theoretical proposal for micromagnetism in U-based heavy fermion compounds, arguing that the mean-field analysis overlooked a ferromagnetic state that dominates in significant parts of the phase diagram.

Contribution

It highlights the importance of considering ferromagnetic states in models of micromagnetism, challenging the completeness of previous mean-field analyses.

Findings

Ferromagnetic state overcomes d-SDW in large phase diagram regions

Mean-field analysis in prior work was incomplete

Revised phase diagram includes ferromagnetic phases

Abstract

In the recent letter [1] by H. Ikeda and Y. Ohashi, a new, very attractive idea is proposed for the explanation of the micromagnetism in U-based heavy fermion compounds. For this sake a nontrivial spin density wave (d-SDW) is introduced. Our goal is to claim, that in the model considered, the mean-field analysis is incomplete: the ferromagnetic state missed by [1] overcomes d-SDW in a large region of the phase diagram (Fig.1 in [1]).