Suppression of ferromagnetism in CeSi_1.81 under temperature and pressure

TL;DR

This study investigates how pressure and temperature influence ferromagnetism in CeSi_1.81, revealing a potential quantum critical point where magnetic order vanishes.

Contribution

It provides new insights into the pressure-induced suppression of ferromagnetism and the possible existence of a quantum critical point in CeSi_1.81.

Findings

Ferromagnetism develops below T_C = 9.5 K at ambient pressure.

Suppression of magnetic order occurs around 13.1 kbar, indicating a quantum critical point.

Additional magnetic modulation appears at low temperatures, suggesting complex magnetic behavior.

Abstract

We have studied the pressure dependence of the magnetization of single crystalline CeSi_1.81. At ambient pressure ferromagnetism develops below T_C = 9.5 Below ~ 5 K an additional shoulder in low-field hysteresis loops and a metamagnetic crossover around 4 T suggest the appearance of an additional magnetic modulation to the ferromagnetic state. The suppression of the magnetic order in CeSi_1.81 as function of temperature at ambient pressure and as function of pressure at low temperature are in remarkable qualitative agreement. The continuous suppression of the ordered moment at p ~ 13.1 kbar suggests the existence of a ferromagnetic quantum critical point in this material.