Spin-exchange Hamiltonian and topological degeneracies in elemental gadolinium
In this report we present a comprehensive study of the magnetic exchange Hamiltonian of elemental gadolinium. We use neutron scattering to measure the magnon spectrum over the entire Brillouin zone and fit the excitations to a spin wave model to extract the first 26 nearest-neighbor magnetic exchang...
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| Veröffentlicht in: | Physical review. B 2022-03, Vol.105 (10), Article 104402 |
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| container_title | Physical review. B |
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| creator | Scheie, A. Laurell, Pontus McClarty, P. A. Granroth, G. E. Stone, M. B. Moessner, R. Nagler, S. E. |
| description | In this report we present a comprehensive study of the magnetic exchange Hamiltonian of elemental gadolinium. We use neutron scattering to measure the magnon spectrum over the entire Brillouin zone and fit the excitations to a spin wave model to extract the first 26 nearest-neighbor magnetic exchange interactions with rigorously defined uncertainty. We find these exchange interactions to follow RKKY behavior, oscillating from ferromagnetic to antiferromagnetic as a function of distance. Finally, we discuss the topological features and degeneracies in Gd, and HCP ferromagnets in general. We show theoretically how, with asymmetric exchange, topological properties could be tuned with a magnetic field. |
| doi_str_mv | 10.1103/PhysRevB.105.104402 |
| format | Article |
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B</jtitle><date>2022-03-02</date><risdate>2022</risdate><volume>105</volume><issue>10</issue><artnum>104402</artnum><issn>2469-9950</issn><eissn>2469-9969</eissn><abstract>In this report we present a comprehensive study of the magnetic exchange Hamiltonian of elemental gadolinium. We use neutron scattering to measure the magnon spectrum over the entire Brillouin zone and fit the excitations to a spin wave model to extract the first 26 nearest-neighbor magnetic exchange interactions with rigorously defined uncertainty. We find these exchange interactions to follow RKKY behavior, oscillating from ferromagnetic to antiferromagnetic as a function of distance. Finally, we discuss the topological features and degeneracies in Gd, and HCP ferromagnets in general. 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| language | eng |
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| source | American Physical Society Journals |
| subjects | CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY elemental metals ferromagnets inelastic neutron scattering magnetic interactions neutron scattering RKKY interaction topological materials |
| title | Spin-exchange Hamiltonian and topological degeneracies in elemental gadolinium |
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