Magnetic properties of the quasicrystal approximant <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Au</mml:mi><mml:mn>65</mml:mn></mml:msub><mml:msub><mml:mi>Ga</mml:mi><mml:mn>21</mml:mn></mml:msub><mml:msub><mml:mi>Tb</mml:mi><mml:mn>14</mml:mn></mml:msub></mml:mrow></mml:math>
Kazuhiro Nawa, Maxim Avdeev, Asuka Ishikawa, Hiroyuki Takakura, Chin‐Wei Wang, Daisuke Okuyama, Ryo Murasaki, Ryuji Tamura, T. Sato
Abstract
The magnetic properties of the quasicrystal approximant ${\mathrm{Au}}_{65}{\mathrm{Ga}}_{21}{\mathrm{Tb}}_{14}$ were investigated using magnetization and neutron diffraction experiments. The temperature dependences of the magnetic susceptibility and magnetization curve indicate dominant ferromagnetic interactions, whereas a whirling antiferromagnetic order was observed in neutron diffraction experiments. In the antiferromagnetic phase, the magnetic moments are aligned almost perpendicular to a pseudofivefold symmetry axis, which corresponds to the easy-axis direction of a Tb atom. Magnetic properties similar to those of ${\mathrm{Au}}_{72}{\mathrm{Al}}_{14}{\mathrm{Tb}}_{14}$ in spite of the substantial difference in the Au concentration suggest the robustness of the easy-axis anisotropy against the chemical environment.