Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au70Si17Tb13
Abstract
Neutron scattering experiments have been performed to elucidate magnetic properties of the quasicrystal approximant Au70Si17Tb13, consisting of icosahedral spin clusters in a body-centered-cubic lattice. Bulk magnetic measurements performed on the single crystalline sample unambiguously confirm long-range ordering at TC = 11.6 ± 1 K. In contrast to the simple ferromagnetic response in the bulk measurements, single crystal neutron diffraction confirms a formation of intriguing non-collinear and non-coplanar magnetic order. The magnetic moment direction was found to be nearly tangential to the icosahedral cluster surface in the local mirror plane, which is quite similar to that recently found in the antiferromagnetic quasicrystal approximant Au72Al14Tb14. Inelastic neutron scattering on the powdered sample exhibits a very broad peak centered at hω ≃ 4 meV. The observed inelastic spectrum was explained by the crystalline-electric-field model taking account of the chemical disorder at the fractional Au/Si sites. The resulting averaged anisotropy axis for the crystalline-electric-field ground state is consistent with the ordered moment direction determined in the magnetic structure analysis, confirming that the non-coplanar magnetic order is stabilized by the local uniaxial anisotropy.
- Authors:
-
[2];
- National Inst. for Materials Science, Tsukuba (Japan)
- Tohoku Univ., Sendai (Japan). Inst. of Multidisciplinary Research for Advanced Materials
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Inst. of Materials Structure Science, Tsukuba (Japan). High Energy Accelerator Research Organization (KEK)
- Tokyo Univ. of Science (Japan)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); MEXT
- OSTI Identifier:
- 1657914
- Grant/Contract Number:
- AC05-00OR22725; JP15H05883; JP16H04018; JP17K18744; JP19H01834; JP19K21839; JP19H05824; JP19H05817; JP19H05818
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physics. Condensed Matter
- Additional Journal Information:
- Journal Volume: 32; Journal Issue: 41; Journal ID: ISSN 0953-8984
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; quasicrystal approximant; non-coplanar magnetic structure; crystalline electric field splitting; neutron scattering
Citation Formats
Hiroto, Takanobu, Sato, Taku J., Cao, Huibo, Hawai, Takafumi, Yokoo, Tetsuya, Itoh, Shinichi, and Tamura, Ryuji. Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au70Si17Tb13. United States: N. p., 2020.
Web. doi:10.1088/1361-648x/ab997d.
Hiroto, Takanobu, Sato, Taku J., Cao, Huibo, Hawai, Takafumi, Yokoo, Tetsuya, Itoh, Shinichi, & Tamura, Ryuji. Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au70Si17Tb13. United States. https://doi.org/10.1088/1361-648x/ab997d
Hiroto, Takanobu, Sato, Taku J., Cao, Huibo, Hawai, Takafumi, Yokoo, Tetsuya, Itoh, Shinichi, and Tamura, Ryuji. Fri .
"Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au70Si17Tb13". United States. https://doi.org/10.1088/1361-648x/ab997d. https://www.osti.gov/servlets/purl/1657914.
@article{osti_1657914,
title = {Noncoplanar ferrimagnetism and local crystalline-electric-field anisotropy in the quasicrystal approximant Au70Si17Tb13},
author = {Hiroto, Takanobu and Sato, Taku J. and Cao, Huibo and Hawai, Takafumi and Yokoo, Tetsuya and Itoh, Shinichi and Tamura, Ryuji},
abstractNote = {Neutron scattering experiments have been performed to elucidate magnetic properties of the quasicrystal approximant Au70Si17Tb13, consisting of icosahedral spin clusters in a body-centered-cubic lattice. Bulk magnetic measurements performed on the single crystalline sample unambiguously confirm long-range ordering at TC = 11.6 ± 1 K. In contrast to the simple ferromagnetic response in the bulk measurements, single crystal neutron diffraction confirms a formation of intriguing non-collinear and non-coplanar magnetic order. The magnetic moment direction was found to be nearly tangential to the icosahedral cluster surface in the local mirror plane, which is quite similar to that recently found in the antiferromagnetic quasicrystal approximant Au72Al14Tb14. Inelastic neutron scattering on the powdered sample exhibits a very broad peak centered at hω ≃ 4 meV. The observed inelastic spectrum was explained by the crystalline-electric-field model taking account of the chemical disorder at the fractional Au/Si sites. The resulting averaged anisotropy axis for the crystalline-electric-field ground state is consistent with the ordered moment direction determined in the magnetic structure analysis, confirming that the non-coplanar magnetic order is stabilized by the local uniaxial anisotropy.},
doi = {10.1088/1361-648x/ab997d},
journal = {Journal of Physics. Condensed Matter},
number = 41,
volume = 32,
place = {United States},
year = {Fri Jul 17 00:00:00 EDT 2020},
month = {Fri Jul 17 00:00:00 EDT 2020}
}
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