TY - JOUR
T1 - Experimental Observation of Long-Range Magnetic Order in Icosahedral Quasicrystals
AU - Tamura, Ryuji
AU - Ishikawa, Asuka
AU - Suzuki, Shintaro
AU - Kotajima, Takahiro
AU - Tanaka, Yujiro
AU - Seki, Takehito
AU - Shibata, Naoya
AU - Yamada, Tsunetomo
AU - Fujii, Takenori
AU - Wang, Chin Wei
AU - Avdeev, Maxim
AU - Nawa, Kazuhiro
AU - Okuyama, Daisuke
AU - Sato, Taku J.
N1 - Funding Information:
We acknowledge and thank S. Yoshida for assistance with the neutron-diffraction experiments. This work was supported by JSPS KAKENHI Grants JP19H05817, JP20H05261, JP21H01044, and, JP19H05818. This work was partly supported by the research program “Dynamic Alliance for Open Innovation Bridging Human, Environment, and Materials”. The travel expenses for the neutron scattering experiment at ANSTO, as well as the experiment at JRR-3, were partly supported by the General User Program for Neutron Scattering Experiments, Institute for Solid State Physics, University of Tokyo.
Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - Quasicrystals (QCs), first discovered in 1984, generally do not exhibit long-range magnetic order. Here, we report on long-range magnetic order in the real icosahedral quasicrystals (i QCs) Au-Ga-Gd and Au-Ga-Tb. The Au65Ga20Gd15 i QC exhibits a ferromagnetic transition at TC = 23 K, manifested as a sharp anomaly in both magnetic susceptibility and specific heat measurements, along with an appearance of magnetic Bragg peak below TC. This is the first observation of long-range magnetic order in a real quasicrystal, in contrast to the spin-glass-like behaviors observed for the other magnetic quasicrystals found to date. Moreover, when Gd is replaced by Tb, i.e., for the Au65Ga20Tb15 i QC, a ferromagnetic behavior is still retained with TC = 16 K. Although the sharp anomaly in the specific heat observed for the Au65Ga20Gd15 i QC becomes broadened upon Tb substitution, neutron diffraction experiments clearly show marked development of magnetic Bragg peaks just below TC, indicating long-range magnetic order for the Au65Ga20Tb15 i QC also. Our findings can contribute to the further investigation of exotic magnetic orders formed on real quasiperiodic lattices with unprecedented highest global symmetry, i.e., icosahedral symmetry.
AB - Quasicrystals (QCs), first discovered in 1984, generally do not exhibit long-range magnetic order. Here, we report on long-range magnetic order in the real icosahedral quasicrystals (i QCs) Au-Ga-Gd and Au-Ga-Tb. The Au65Ga20Gd15 i QC exhibits a ferromagnetic transition at TC = 23 K, manifested as a sharp anomaly in both magnetic susceptibility and specific heat measurements, along with an appearance of magnetic Bragg peak below TC. This is the first observation of long-range magnetic order in a real quasicrystal, in contrast to the spin-glass-like behaviors observed for the other magnetic quasicrystals found to date. Moreover, when Gd is replaced by Tb, i.e., for the Au65Ga20Tb15 i QC, a ferromagnetic behavior is still retained with TC = 16 K. Although the sharp anomaly in the specific heat observed for the Au65Ga20Gd15 i QC becomes broadened upon Tb substitution, neutron diffraction experiments clearly show marked development of magnetic Bragg peaks just below TC, indicating long-range magnetic order for the Au65Ga20Tb15 i QC also. Our findings can contribute to the further investigation of exotic magnetic orders formed on real quasiperiodic lattices with unprecedented highest global symmetry, i.e., icosahedral symmetry.
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U2 - 10.1021/jacs.1c09954
DO - 10.1021/jacs.1c09954
M3 - Article
C2 - 34786934
AN - SCOPUS:85119921157
SN - 0002-7863
VL - 143
SP - 19938
EP - 19944
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 47
ER -