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Title: Long-range magnetic order in real icosahedral quasicrystals
Authors: Tamura, R
Ishikawa, A
Suzuki, S
Kotajima, A
Tanaka, Y
Seki, T
Shibata, N
Yamada, T
Fujii, T
Wang, CW
Avdeev, M
Sato, T
Keywords: Interaction range
Crystal structure
Specific heat
Magnetic properties
Neutron diffraction
Issue Date: 22-Mar-2021
Publisher: Research Square
Citation: Tamura, R., Ishikawa, A., Suzuki, S., Kotajima, A., Tanaka, Y., Seki, T., Shibata, N., Yamada, T., Fujii, T., Wang, C.-W., Avdeev, M., & Sato, T. (2021). Long-range magnetic order in real icosahedral quasicrystals. 22 March 2021, PREPRINT (Version 1) available at Research Square. doi:10.21203/]
Abstract: 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. Quick magnetic saturation to almost the full moment (7μB/Gd3+) is observed under 100 Oe at 2 K. This is the first observation of long-range magnetic order in a real quasicrystal, in contrast to the spin-glass-like behaviours 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 behaviour is still retained with TC = 16 K. Although the sharp anomaly in the specific heat observed for the Au65Ga20Gd15 i QC is significantly broadened upon Tb substitution, neutron-diffraction experiments clearly show the marked development of magnetic Bragg peaks 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. © This work is licensed under a CC BY 4.0 License.
Description: This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal.
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