Magnetization of the Mn1−xFexSi in high magnetic field up to 50 T: Possible evidence of a field-induced Griffiths phase

JETP Letters. 2016. Vol. 104. No. 2. P. 116–123.

Демишев С. В., Samarin A. N., Huang J., Glushkov V. V., Lobanova I. I., Sluchanko N. E., Chubova N. M., Dyadkin V. A., Grigoriev S. V., Каган М. Ю., Vanacken J., Moshchalkov V. V.

Magnetic properties of single crystals of Mn1−xFexSi 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 Mn1−xFexSi in the paramagnetic phase follows power law M(B) ~ Bα with the exponents α ∼ 0.33 − 0.5, which starts above characteristic fields Bc ∼ 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 5T 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.

Ключевые слова: magnetization, намагниченность, Magnetic properties, SQUID measurements, Griffiths phase, магнитные свойства, СКВИД-измерения, фаза Гриффитса

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