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2023-01-16T04:07:29Z
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Direct Observation of Momentum-Dependent Exchange Interaction in a Heisenberg Ferromagnet
Miyazaki, H.
54382
Ito, T.
54383
Im, H. J.
54384
Yagi, S.
54385
Kato, M.
54386
Soda, K.
54387
Kimura, S.
54388
We measured the temperature-dependent three-dimensional angle-resolved photoemission spectra of EuO (100) thin film, a typical Heisenberg ferromagnetic semiconductor, to investigate the essential origin of the ferromagnetic transition. We observed sizable energy dispersion and large binding-energy shift of the Eu 4f state below the Curie temperature only near the Γ and X points, despite the expected Heisenberg-type local magnetism. The band dispersion and temperature dependence of the Eu 4f state indicates that the indirect exchange and superexchange interactions have strong momentum dependence. The observed temperature-dependent energy shift of the 4f state is the essential origin of the magnetism of EuO.
journal article
American Physical Society
2009-06
application/pdf
Physical Review Letters
102
227203
227203
http://dx.doi.org/10.1103/PhysRevLett.102.227203
http://hdl.handle.net/2237/20774
0031-9007
https://nagoya.repo.nii.ac.jp/record/18679/files/PhysRevLett_102_227203.pdf
eng
https://doi.org/10.1103/PhysRevLett.102.227203
©2009 American Physical Society