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arXiv · 1910.13642

Magnetic anisotropy of chiral magnet Yb(Ni$_{1-x}$Cu$_x$)$_{3}$Al$_{9}$ at high magnetic fields

D. Ito·T. Matsumura·S. Ohara
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Abstract

We have measured the magnetization of rare-earth chiral magnets Yb(Ni$_{1-x}$Cu$_x$)$_{3}$Al$_{9}$ for $x$=0 and 0.06 up to 14.5 T. Magnetization for the field direction $H \parallel c$, which is the hard axis at low temperatures and low fields, overtakes the easy axis magnetization for $H \perp c$ above $\sim$4 T. We analyzed this overtaking of the magnetization curves by considering a crystalline electric field model. It is shown that the $B_{66}$ term, which connects the $|\pm5/2 \rangle$ and the $|\mp7/2\rangle$ states through the off-diagonal matrix element, is responsible for the characteristic magnetization process in this compound. We also introduce orbital dependent exchange interactions to explain the temperature dependence of magnetic susceptibility.

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D. Ito, T. Matsumura, S. Ohara. 2019-10-30. Magnetic anisotropy of chiral magnet Yb(Ni$_{1-x}$Cu$_x$)$_{3}$Al$_{9}$ at high magnetic fields. https://doi.org/10.7566/jpscp.30.011168

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