Comment on "Nature of the high-pressure tricritical point in MnSi"

TL;DR

This paper critiques a previous study on MnSi, clarifying a misinterpretation of the Landau expansion terms that led to unsupported conclusions about its phase diagram.

Contribution

It clarifies the correct interpretation of the Landau expansion in analyzing MnSi's phase diagram, correcting prior misidentification of key coefficients.

Findings

Corrected the interpretation of the Landau expansion terms

Disputed previous conclusions about MnSi's phase diagram

Highlighted the importance of proper coefficient identification in phase analysis

Abstract

It is argued that M. Otero-Leal et al. [PRB 79, 060401 (2009) [1] wrongly identified the second order term of the Arrott equation with the coefficient at the quartic term of the Landau expansion, therefore deriving absolutely unsupported conclusions on the phase diagram of MnSi.