Regensburg 2013 – scientific programme
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KR: Fachgruppe Kristallographie
KR 2: Multiferroics 2 (MA jointly with DF, DS, KR, TT)
KR 2.12: Talk
Monday, March 11, 2013, 18:00–18:15, H3
Low-lying magnetic excitations in the distorted triangular lattice antiferromagnet α-CaCr2O4 — •Michael Schmidt1, Zhe Wang1, Sandor Toth2, Bella Lake2, A.T.M.Nazmul Islam2, Alois Loidl1, and Joachim Deisenhofer1 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
We will discuss our results on α-CaCr2O4 obtained by FIR and Terahertz spectroscopy. This compound orders below TN = 42.6 K in a proper screw 120∘ magnetic order, but shows additional low-lying magnetic modes indicative for the vicinity of a more complex magnetic order [1], [2]. Our spectra obtained by FTIR and THz-TD spectroscopy show several optical magnons appearing below the magnetic ordering with anomalous temperature dependence. We will discuss their polarization dependence and a possible magnetoelastic coupling of these modes.
[1] S. Toth et al., Phys. Rev. B 84, 054452 (2011)
[2] S. Toth et al., PRL 109, 127203 (2012)