Magnetic boson peak in classical spin glasses
We revisited spin dynamics in archetypical classical spin-glass (SG) systems, such as Cu_{1−x}Mn_{x} (x=0.017, 0.034, and 0.067) dilute alloys and iron aluminosilicate glass, using a modern neutron scattering spectrometer with high neutron flux. The former is crystalline, and the latter is amorphous...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-01-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.013006 |
| _version_ | 1797210290357534720 |
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| author | Maiko Kofu Seiko Ohira-Kawamura Naoki Murai Rieko Ishii Daigorou Hirai Hiroshi Arima Kenichi Funakoshi |
| author_facet | Maiko Kofu Seiko Ohira-Kawamura Naoki Murai Rieko Ishii Daigorou Hirai Hiroshi Arima Kenichi Funakoshi |
| author_sort | Maiko Kofu |
| collection | DOAJ |
| description | We revisited spin dynamics in archetypical classical spin-glass (SG) systems, such as Cu_{1−x}Mn_{x} (x=0.017, 0.034, and 0.067) dilute alloys and iron aluminosilicate glass, using a modern neutron scattering spectrometer with high neutron flux. The former is crystalline, and the latter is amorphous, where their SG state is well separated from magnetically ordered phases. Bose-scaled localized magnetic excitations were observed in both compounds below the spin-freezing temperature (T_{f}). The spectrum exhibits a maximum at low energy and a broad tail on the high-energy side. The excitation energy tends to be higher for the material with higher T_{f}. Above T_{f}, the spectrum considerably changes with temperature, thereby indicating the emergence of the magnetic relaxation process. The magnetic excitation in the SG state has much in common with the boson peak in structural glasses. We consider that the Bose-scaled broad excitation peak is an elementary excitation inherent in disordered systems. |
| first_indexed | 2024-04-24T10:08:15Z |
| format | Article |
| id | doaj.art-2ab492ca687446bb9a01d9a0e3e898b2 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:08:15Z |
| publishDate | 2024-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-2ab492ca687446bb9a01d9a0e3e898b22024-04-12T17:37:36ZengAmerican Physical SocietyPhysical Review Research2643-15642024-01-016101300610.1103/PhysRevResearch.6.013006Magnetic boson peak in classical spin glassesMaiko KofuSeiko Ohira-KawamuraNaoki MuraiRieko IshiiDaigorou HiraiHiroshi ArimaKenichi FunakoshiWe revisited spin dynamics in archetypical classical spin-glass (SG) systems, such as Cu_{1−x}Mn_{x} (x=0.017, 0.034, and 0.067) dilute alloys and iron aluminosilicate glass, using a modern neutron scattering spectrometer with high neutron flux. The former is crystalline, and the latter is amorphous, where their SG state is well separated from magnetically ordered phases. Bose-scaled localized magnetic excitations were observed in both compounds below the spin-freezing temperature (T_{f}). The spectrum exhibits a maximum at low energy and a broad tail on the high-energy side. The excitation energy tends to be higher for the material with higher T_{f}. Above T_{f}, the spectrum considerably changes with temperature, thereby indicating the emergence of the magnetic relaxation process. The magnetic excitation in the SG state has much in common with the boson peak in structural glasses. We consider that the Bose-scaled broad excitation peak is an elementary excitation inherent in disordered systems.http://doi.org/10.1103/PhysRevResearch.6.013006 |
| spellingShingle | Maiko Kofu Seiko Ohira-Kawamura Naoki Murai Rieko Ishii Daigorou Hirai Hiroshi Arima Kenichi Funakoshi Magnetic boson peak in classical spin glasses Physical Review Research |
| title | Magnetic boson peak in classical spin glasses |
| title_full | Magnetic boson peak in classical spin glasses |
| title_fullStr | Magnetic boson peak in classical spin glasses |
| title_full_unstemmed | Magnetic boson peak in classical spin glasses |
| title_short | Magnetic boson peak in classical spin glasses |
| title_sort | magnetic boson peak in classical spin glasses |
| url | http://doi.org/10.1103/PhysRevResearch.6.013006 |
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