Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.161: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magnetic properties of nitrid-clusterfullerene Dy3N@C80 — •Y. Arango, S. Yang, V. Kataev, L. Dunsch, and B. Büchner — Leibniz Institute for Solid State and Materials Research IFW Dresden
Metal-cluster fullerenes in which paramagnetic rare-earth ions are trapped inside the carbon cage represent a novel class of molecular magnets. However little is known about their magnetic properties because conventional methods of synthesis have very small yields ( < 1 %) and the product is often multiphase. However recent success of the synthesis of nitride-clusterfullerenes of high yield and purity opens a possibility to get insights into the magnetism of these compounds. Here we report on magnetic characterization of a clusterfullerene Dy3N@C80 which was produced by a modified Krätschmer-Huffman DC-arc discharging method with the addition of NH3 as the reactive gas atmosphere. The high purity of the product has been checked by a number of analytical techniques. We have studied the static magnetization of Dy3N@C80 in the temperature range from 2 K to 300 K in magnetic fields up to 5 T. Measurements of the saturation magnetization as well the estimate of the Curie constant, both yield a strongly reduced value of the Dy magnetic moment µeff ≈ 5µB which amounts only to about a half of the free ion value µeffDy3+ = 10.5µB. We discuss possible scenarios of the anomalous reduction of the moment, such as a strong frustration of magnetic exchange in the Dy3N-cluster or an unusually large Dy single-ion anisotropy.