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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.72: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

Magnetic order in thin films of the heavy fermion superconductor UNi₂Al₃ — •Martin Jourdan¹, Andrey Zakharov¹, Arno Hiess², Tim Charlton³, Nick Bernhoeft⁴, Danny Mannix⁵, and Hermann Adrian¹ — ¹Institut für Physik, Johannes Gutenberg Universität, 55099 Mainz, Germany — ²Institut Laue Langevin, BP 156, F-38042 Grenoble, France — ³Rutherford Appelton Laboratory, ISIS facility, UK — ⁴Dépt. de Recherche Fond. sur la Matière, France — ⁵XMaS UK CRG beamline, ESRF, BP 220, F-38043 Grenoble Cedex 9, France

In the case of the heavy fermion superconductor UNi₂Al₃ a strong interconnection between its superconducting and magnetic properties is expected. Thus a careful characterization of the magnetic state of thin film samples primarily prepared for the investigation of the unconventional superconducting properties of this compound is necessary.
Resonant magnetic x-ray scattering was employed to investigate the magnetic state of epitaxial a^* oriented thin films UNi₂Al₃. The observed incommensurate propagation vector as well as the Neél temperature correspond to those of bulk samples. The 1200Å film shows magnetic order with a correlation length > 800 Å parallel to the growth axis. Out of the three possible magnetic domains the one with the moment direction perpendicular to the film surface is not realized.