Magnetization of the Mn$_{1-x}$Fe$_x$Si in high magnetic field up to 50 T: possible evidence of a field-induced Griffiths phase

TL;DR

This study investigates the magnetic behavior of Mn$_{1-x}$Fe$_x$Si in high magnetic fields up to 50 T, revealing power-law magnetization and suggesting a possible field-induced Griffiths phase influenced by spin-polaron effects.

Contribution

It provides experimental evidence of a field-induced Griffiths phase in Mn$_{1-x}$Fe$_x$Si at high magnetic fields, expanding understanding of magnetic phases in this material.

Findings

Magnetization follows a power law $M(B) \\sim B^\\alpha$ with $\\alpha \\sim 0.33-0.5$

Anomalous behavior appears above characteristic fields $B_c \\sim 1.5-7$ T

Possible formation of a field-induced Griffiths phase influenced by spin-polaron effects

Abstract

Magnetic properties of single crystals of Mn$_{1-x}$Fe$_x$Si solid solutions with $x < 0.2$ are investigated by pulsed field technique in magnetic fields up to 50 T. It is shown that magnetization of Mn$_{1-x}$Fe$_x$Si in the paramagnetic phase follows power law $M(B) \sim B^\alpha$ with the exponents $\alpha \sim 0.33-0.5$, which starts above characteristic fields $B_c \sim 1.5-7$ T depending on the sample composition and lasts up to highest used magnetic field. Analysis of magnetization data including SQUID measurements in magnetic fields below 5 T suggests that this anomalous behavior may be likely attributed to the formation of a field-induced Griffiths phase in the presence of spin-polaron effects.