Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets 1
TT 8.8: Vortrag
Montag, 25. Februar 2008, 16:00–16:15, H 0104
High field magnetic resonance study of the spin antiferromagnet GdNi2B2C (exchanged with TT 30.4) — •Ferenc Murányi1, Uwe Schaufuß1, Mathias Dörr2, Martin Rotter3, Vladislav Kataev1, and Bernd Büchner1 — 1IFW Dresden, Institute for Solid State Research, D-01171 Dresden, PO BOX 270116, Germany — 2Institut for Physics of Solids, Technical University Dresden, D-01062 Dresden, Germany — 3Institute for Physical Chemistry, University of Vienna, A-1090 Vienna, Währingerstr. 42, Austria
The Antiferromagnetic Resonance (AFMR) was measured on a thick slab of single crystal GdNi2B2C in the antiferromagnetic state. In the paramagnetic state Electron Spin Resonance (ESR) study was done. The magnetic properties of the material were studied applying the external magnetic field parallel and perpendicular to the easy plane. The measured data revealed the anisotropy of the Korringa relaxation rate in the paramagnetic state indicating anisotropic interaction between the localized 4f moments and conduction electrons. In the antiferromagnetic state we observed a large out-of-plane anisotropy gap of ∼ 76 GHz which is higher than expected from the dipole-dipole interaction. Surprisingly, we also observed an in-plane gap with the same order of magnitude. In addition we found indications that the external magnetic field induces symmetry-breaking distortions in this material. The work was supported by DFG through SFB 463.