Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 5: Spin-Structures and Magnetic Phase Transitions I
MA 5.9: Vortrag
Montag, 27. März 2006, 12:15–12:30, HSZ 403
Magneto-optical Anisotropy of UPtGe — •M. Marutzky1, J. Schoenes1, and R. Troc2 — 1Institut für Physik der Kondensierten Materie und Hochmagnetfeldanlage, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig — 2Institute for Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland
UPtGe crystallizes in an orthorhombic EuAuGe structure. It has an incommensurable helical spin structure with TN = 50 K and two uranium sites with different magnetic moments. The magnetic and electrical properties of UPtGe are anisotropic [2]. Thereby the temperature dependence of the magnetization is similar along the a- and the c-direction, while b is the magnetic hard axis. Also the electrical properties are similar for a and c and different for b. The optical conductivity is anisotropic and merges in the dc-conductivity [3].
In this contribution the polar Kerr-rotation and -ellipticity from 1 to 4 eV of UPtGe single crystalls near TN at 12 T are presented, with various orientations of the crystal axes relative to the magnetic field and the polarization vector of the light. The Kerr-spectra are affected by the magnetic and optical anisotropy and exhibit rotations up to 0.15∘. The off-diagonal elements of the optical conductivity are calculated in order to discuss the electronic structure of UPtGe.
[1] D. Mannix et al., Phys. Rev. B 62, 3801 (2000)
[2] R. Troć et al., Phys. Rev. B 69, 094422 (2004)
[3] M. Marutzky et al., to be published