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TT: Fachverband Tiefe Temperaturen
TT 49: CE: Spin Systems and Itinerant Magnets 2
TT 49.12: Vortrag
Donnerstag, 17. März 2011, 17:00–17:15, HSZ 03
Mössbauer Spectroscopic Study of Spin and Orbital Order in FeCr2S4 — •Josefin Engelke1, Jochen Litterst1, Alexander Krimmel2, Alois Loidl2, Friedrich Wagner3, Michael Kalvius3, and Vladimir Tsurkan2,4 — 1IPKM TU Braunschweig, Germany, e-mail: j.engelke@tu-bs.de — 2Experimentalphysik V, Universität Augsburg, Germany, e-mail: alois.loidl@physik.uni-augsburg.de — 3Physics-Department TU München, Germany, e-mail:kalvius@ph.tum.de — 4Inst. Applied Physics, Acad. Sciences Moldava, Republic of Moldava
The spinel FeCr2S4 has been studied intensely in the past for its peculiar magnetic and local structural changes, which are sensitively influenced by the Jahn- Teller properties of Fe2+ in tetrahedral sulphur coordination. Recent muon spin rotation data [1] give strong evidence that the collinear ferrimagnetism found below TC = 165 K changes to an incommensurate structure below 50 K. Recent high resolution X-ray studies reveal a broadening of Bragg peaks below 50 K and a maximum of mean square displacement around 15 K [2]. Below 10 K orbital order is concluded from specific heat data [2].
We present Mössbauer spectroscopic data taken on the same samples as used in [1, 2]. The influence on spectral shape by changing Jahn-Teller dynamics will be discussed. Special emphasis is placed on the interpretation of the spectra close to the magnetic and orbital transitions.
G. M. Kalvius et al., J. Phys.: Condens. Matter 22, 052205 (2010)
V. Tsurkan et al., Phys. Rev. B81, 184486 (2010)