Long-range magnetic order in real icosahedral quasicrystals
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Date
2021-03-22
Journal Title
Journal ISSN
Volume Title
Publisher
Research Square
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.
Keywords
Interaction range, Crystal structure, Ferromagnetism, Specific heat, Magnetic properties, Neutron diffraction
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. Research Square, Preprint (Version 1). doi:10.21203/rs.3.rs-215127/v1]