Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides
The Raman optical activity (ROA) of magnons in rutile-structure antiferromagnetic FeF₂
 (TN = 78 K) has been studied as a function of temperature and applied magnetic field. For exciting
 light incident along the c axis, ROA is observed for magnons but not for phonons. In zero field,...
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| Published in: | Физика низких температур |
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| Date: | 2005 |
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| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2005
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/121698 |
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| Cite this: | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides / K.R. Hoffman, D.J. Lockwood, W.M. Yen // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1032-1041. — Бібліогр.: 32 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862528772456054784 |
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| author | Hoffman, K.R. Lockwood, D.J. Yen, W.M. |
| author_facet | Hoffman, K.R. Lockwood, D.J. Yen, W.M. |
| citation_txt | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides / K.R. Hoffman, D.J. Lockwood, W.M. Yen // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1032-1041. — Бібліогр.: 32 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The Raman optical activity (ROA) of magnons in rutile-structure antiferromagnetic FeF₂
(TN = 78 K) has been studied as a function of temperature and applied magnetic field. For exciting
light incident along the c axis, ROA is observed for magnons but not for phonons. In zero field, a
small splitting (0.09 cm⁻¹) of the two acoustic–magnon branches is observed for the first time by
inelastic light scattering. The splitting in applied magnetic field is found to reduce with increasing
temperature in accordance with theory. No ROA was detected for two-magnon excitations. In optical
absorption measurements performed over thirty years ago, a very small circular dichroism
(CD) was observed in the magnon sidebands of other simple rutile antiferromagnetic fluorides
(MnF₂ and CoF₂). The origin of this CD was not understood at the time. The Raman studies of the
one-magnon Raman scattering in FeF₂ have demonstrated that in zero field the degeneracy of the
antiferromagnetic magnon branches is lifted by a weak magnetic dipole–dipole interaction, as predicted
by Pincus and Loudon and by White four decades ago. The source of the observed CD in the
magnon sidebands can now be traced to this same magnetic–dipole induced splitting.
|
| first_indexed | 2025-11-24T02:25:34Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-121698 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-24T02:25:34Z |
| publishDate | 2005 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Hoffman, K.R. Lockwood, D.J. Yen, W.M. 2017-06-15T13:28:25Z 2017-06-15T13:28:25Z 2005 Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides / K.R. Hoffman, D.J. Lockwood, W.M. Yen // Физика низких температур. — 2005. — Т. 31, № 8-9. — С. 1032-1041. — Бібліогр.: 32 назв. — англ. 0132-6414 PACS: 75.30.Ds, 75.30.Gw, 75.50.Ee, 78.20.Ls, 78.30.Hv https://nasplib.isofts.kiev.ua/handle/123456789/121698 The Raman optical activity (ROA) of magnons in rutile-structure antiferromagnetic FeF₂
 (TN = 78 K) has been studied as a function of temperature and applied magnetic field. For exciting
 light incident along the c axis, ROA is observed for magnons but not for phonons. In zero field, a
 small splitting (0.09 cm⁻¹) of the two acoustic–magnon branches is observed for the first time by
 inelastic light scattering. The splitting in applied magnetic field is found to reduce with increasing
 temperature in accordance with theory. No ROA was detected for two-magnon excitations. In optical
 absorption measurements performed over thirty years ago, a very small circular dichroism
 (CD) was observed in the magnon sidebands of other simple rutile antiferromagnetic fluorides
 (MnF₂ and CoF₂). The origin of this CD was not understood at the time. The Raman studies of the
 one-magnon Raman scattering in FeF₂ have demonstrated that in zero field the degeneracy of the
 antiferromagnetic magnon branches is lifted by a weak magnetic dipole–dipole interaction, as predicted
 by Pincus and Loudon and by White four decades ago. The source of the observed CD in the
 magnon sidebands can now be traced to this same magnetic–dipole induced splitting. The precise experimental work of Professor F.L.
 Scarpace and Dr. Y.H. (Russ) Wong from thirty years
 ago is noted with appreciation. We thank Professors
 R. M. White and M. G. Cottam for useful discussions
 and the National Science Foundation for continued
 support spanning these three decades. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур К семидесятилетию антиферромагнетизма Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides Article published earlier |
| spellingShingle | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides Hoffman, K.R. Lockwood, D.J. Yen, W.M. К семидесятилетию антиферромагнетизма |
| title | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides |
| title_full | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides |
| title_fullStr | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides |
| title_full_unstemmed | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides |
| title_short | Circular dichroism and Raman optical activity in antiferromagnetic transition metal fluorides |
| title_sort | circular dichroism and raman optical activity in antiferromagnetic transition metal fluorides |
| topic | К семидесятилетию антиферромагнетизма |
| topic_facet | К семидесятилетию антиферромагнетизма |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/121698 |
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