Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Spin Dynamics / Spin Torque IV
MA 26.9: Vortrag
Donnerstag, 25. März 2010, 16:30–16:45, H10
ESR in CuCrO2 — •Mamoun Hemmida1, Hans-Albrecht Krug von Nidda1, Nikola Pascher1, Alois Loidl1, and Christine Martin2 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany — 2Laboratoire CRISMAT, UMR 6508 CNRS-ENSICAEN, and IRMA FR3095, 6 Boulevard Maréchal Juin, Caen Cedex 4, France
Electron Spin Resonance (ESR) measurements were performed at X band (9.4 GHz) frequency on a delafossite compound CuCrO2, both on single crystal and polycrystalline samples, which represents a model system of the two-dimensional triangular lattice Heisenberg antiferromag- net. The spin-spin relaxation behavior, which appears in the temperature dependence of the linewidth is similar to that previously observed in some iso-structural rock salt Cr- compounds like HCrO2, LiCrO2, and NaCrO2. In those oxides, the linewidth is well described in terms of a Berezinskii-Kosterlitz-Thouless (BKT) like scenario [1, 2, 3]. The deviation from the ideal BKT scenario was attributed to the effect of geometrical frustration [4]. References [1] V. L. Berezinskii, Sov. Phys. JETP 32, 493 (1971). [2] J. M. Kosterlitz and D. J. Thouless, J. Phys. C 6, 1181 (1973). [3] J. M. Kosterlitz, J. Phys. C 7, 1046 (1974). [4] Hemmida, M., Krug von Nidda, H.-A., Buettgen, N., Loidl, A. , Alexander, L. K., Nath, R., Mahajan, A. V., Berger, R. F., Cava, R. J., Singh, Yogesh, and Johnston, D. C., Phys. Rev. B 80, 054406 (2009). 1