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 show an anomalou...
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| Дата: | 2012 |
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| Автори: | , , , , , , , |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2012
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/117189 |
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| Цитувати: | 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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irk-123456789-1171892017-05-21T03:03:27Z 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 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. 2012 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/117189 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Низкотемпеpатуpный магнетизм Низкотемпеpатуpный магнетизм |
| spellingShingle |
Низкотемпеpатуpный магнетизм Низкотемпеpатуpный магнетизм Gnezdilov, V. Deisenhofer, J. Lemmens, P. Wulferding, D. Afanasiev, O. Ghigna, P. Loidl, A. Yeremenko, A. Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃ 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. |
| format |
Article |
| 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. |
| author_sort |
Gnezdilov, V. |
| title |
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_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_sort |
phononic and magnetic excitations in the quasi-one-dimensional heisenberg antiferromagnet kcuf₃ |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2012 |
| topic_facet |
Низкотемпеpатуpный магнетизм |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/117189 |
| 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. |
| series |
Физика низких температур |
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