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arXiv · 1605.05519

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

S. V. Demishev·A. N. Samarin·J. Huang·V. V. Glushkov·I. I. Lobanova·N. E. Sluchanko·N. M. Chubova·V. A. Dyadkin·S. V. Grigoriev·M. Yu. Kagan·J. Vanacken·V. V. Moshchalkov
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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.

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S. V. Demishev, A. N. Samarin, J. Huang, V. V. Glushkov, I. I. Lobanova, N. E. Sluchanko, N. M. Chubova, V. A. Dyadkin, S. V. Grigoriev, M. Yu. Kagan, J. Vanacken, V. V. Moshchalkov. 2016-05-18. 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. https://doi.org/10.1134/s0021364016140022

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