Magnetic anisotropy of chiral magnet Yb(Ni${}_{1-x}$Cu${}_x$)${}_3$Al${}_9$ at high magnetic fields

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 $|\pm 5/2⟩$ and the $|\mp 7/2⟩$ 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.

arXiv comment6 pages, 3 figures, proceedings of SCES2019

References in corpus (3)

• Finite-Temperature Properties of Three-Dimensional Classical Chiral Helimagnets
• Chiral Soliton Lattice Formation in Monoaxial Helimagnet Yb(Ni${}_{1-x}$Cu${}_x$)${}_3$Al${}_9$
• Lock-in of a Chiral Soliton Lattice by Itinerant Electrons

Cited by in corpus (2)

• Crystal field excitation in the chiral helimagnet YbNi${}_3$Al${}_9$
• Conical Magnetic Structure and Atomic Displacements in Chiral Helimagnet Yb(Ni,Cu)${}_3$Al${}_9$ in Magnetic Fields along the Helical $c$ Axis