Phononic and magnetic excitations in the quasi-one-dimensional Heisenberg antiferromagnet KCuF₃

• Дата: 2012
• Автори: Gnezdilov, V., Deisenhofer, J., Lemmens, P., Wulferding, D., Afanasiev, O., Ghigna, P., Loidl, A., Yeremenko, A.
• Формат: Стаття
• Мова: English
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Назва видання: Физика низких температур
• Теми: Низкотемпеpатуpный магнетизм
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/117189
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• 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.

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.