Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃
The Raman-active phonons and magnetic excitations in the orbitally ordered, quasi-one-dimensional Heisenberg
 antiferromagnet KCuF₃ are studied as a function of temperature in the range between 3 and 290 K in various
 scattering configurations. The low-energy Eg and B1g phonon modes...
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| Published in: | Физика низких температур |
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| Date: | 2012 |
| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2012
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/117189 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ / V. Gnezdilov, J. Deisenhofer, P. Lemmens, D. Wulferding, O. Afanasiev, P. Ghigna, A. Loidl, A. Yeremenko // Физика низких температур. — 2012. — Т. 38, № 5. — С. 538-548. — Бібліогр.: 66 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862612654774812672 |
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| author | Gnezdilov, V. Deisenhofer, J. Lemmens, P. Wulferding, D. Afanasiev, O. Ghigna, P. Loidl, A. Yeremenko, A. |
| author_facet | Gnezdilov, V. Deisenhofer, J. Lemmens, P. Wulferding, D. Afanasiev, O. Ghigna, P. Loidl, A. Yeremenko, A. |
| citation_txt | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ / V. Gnezdilov, J. Deisenhofer, P. Lemmens, D. Wulferding, O. Afanasiev, P. Ghigna, A. Loidl, A. Yeremenko // Физика низких температур. — 2012. — Т. 38, № 5. — С. 538-548. — Бібліогр.: 66 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The Raman-active phonons and magnetic excitations in the orbitally ordered, quasi-one-dimensional Heisenberg
antiferromagnet KCuF₃ are studied as a function of temperature in the range between 3 and 290 K in various
scattering configurations. The low-energy Eg and B1g phonon modes show an anomalous softening (~25%
and ~13%) between room temperature and the characteristic temperature TS = 50 K. In this temperature range a
freezing-in of F–
ion dynamic displacements is proposed to occur. In addition, the Eg mode at about 260 cm⁻¹
clearly splits below TS. The widths of the phonon lines above TS follow an activated behavior with an activation
energy of about 50 K. Our observations clearly evidence a reduction of the lattice symmetry below TS and indicate
a strong coupling of lattice, spin, and orbital fluctuations for T > TS. A strongly polarization dependent quasielastic
scattering is observed at temperatures above TN = 39 K due to magnetic-energy fluctuations. For temperatures
below TN a rich spectrum of additional modes is observed, with different lineshape, polarization and
temperatures dependence. We attribute them to longitudinal and transverse magnetic modes as well as to a continuum
of magnetic excitations.
|
| first_indexed | 2025-11-29T05:02:38Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-117189 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-29T05:02:38Z |
| publishDate | 2012 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Gnezdilov, V. Deisenhofer, J. Lemmens, P. Wulferding, D. Afanasiev, O. Ghigna, P. Loidl, A. Yeremenko, A. 2017-05-20T16:59:47Z 2017-05-20T16:59:47Z 2012 Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ / V. Gnezdilov, J. Deisenhofer, P. Lemmens, D. Wulferding, O. Afanasiev, P. Ghigna, A. Loidl, A. Yeremenko // Физика низких температур. — 2012. — Т. 38, № 5. — С. 538-548. — Бібліогр.: 66 назв. — англ. 0132-6414 PACS: 63.20.–e, 75.25.–j, 75.25.Dk, 75.50.–y, 78.30.–j https://nasplib.isofts.kiev.ua/handle/123456789/117189 The Raman-active phonons and magnetic excitations in the orbitally ordered, quasi-one-dimensional Heisenberg
 antiferromagnet KCuF₃ are studied as a function of temperature in the range between 3 and 290 K in various
 scattering configurations. The low-energy Eg and B1g phonon modes show an anomalous softening (~25%
 and ~13%) between room temperature and the characteristic temperature TS = 50 K. In this temperature range a
 freezing-in of F–
 ion dynamic displacements is proposed to occur. In addition, the Eg mode at about 260 cm⁻¹
 clearly splits below TS. The widths of the phonon lines above TS follow an activated behavior with an activation
 energy of about 50 K. Our observations clearly evidence a reduction of the lattice symmetry below TS and indicate
 a strong coupling of lattice, spin, and orbital fluctuations for T > TS. A strongly polarization dependent quasielastic
 scattering is observed at temperatures above TN = 39 K due to magnetic-energy fluctuations. For temperatures
 below TN a rich spectrum of additional modes is observed, with different lineshape, polarization and
 temperatures dependence. We attribute them to longitudinal and transverse magnetic modes as well as to a continuum
 of magnetic excitations. We like to thank M.V. Eremin and B. Lake for important
 discussions. D.W. and P.L. acknowledges support
 by B-IGSM and NTH “Contacs in Nanosystems”. We also
 acknowledge support by the DFG via TRR80 and via LE
 967/6-1 and the Swiss NSF through NCCR MaNEP. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Низкотемпеpатуpный магнетизм Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ Article published earlier |
| spellingShingle | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ Gnezdilov, V. Deisenhofer, J. Lemmens, P. Wulferding, D. Afanasiev, O. Ghigna, P. Loidl, A. Yeremenko, A. Низкотемпеpатуpный магнетизм |
| title | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ |
| title_full | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ |
| title_fullStr | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ |
| title_full_unstemmed | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ |
| title_short | Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ |
| title_sort | phononic and magnetic excitations in the quasi-one-dimensional heisenberg antiferromagnet kcuf₃ |
| topic | Низкотемпеpатуpный магнетизм |
| topic_facet | Низкотемпеpатуpный магнетизм |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/117189 |
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