Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.77: Poster
Thursday, March 17, 2011, 10:00–13:00, P1
Spin excitations in the antiferromagnetic and antiferroquadrupolar phase of CeB6 — •G. Friemel1, Y. Li1, A. Invanov2, V. B. Filipov3, N. Yu. Shitsevalova3, N. E. Sluchanko4, and D. S. Inosov1 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany — 2Institut Laue-Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, France — 3I. N. Frantsevich Institute for Problems of Material Science, National Academy of Sciences of Ukraine, ul. Krzhizhanovskogo 3, Kiev, 03680, Ukraine — 4A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia
We present inelastic neutron scattering studies on CeB6, a rare earth hexaboride. In zero field CeB6 exhibits a paramagnetic phase at high temperatures and orders antiferromagnetically below TN=2.3 K. However, below TQ= 3.2 K a peculiar "antiferroquadrupolar" (AFQ)-phase of the cerium ions appears, whose nature is so far controversial. Multipolar excitations in zero field have been theoretically predicted and partially studied. The mechanism behind this type of ordering is still in question since spin excitation data is sparsely available. Therefore, we present a first comprehensive temperature and energy dependent mapping of the spin excitations in the AFM and AFQ phases, which are dominated by a pronounced inelastic intensity in the vicinity of the AFQ wavevector (1/2 1/2 1/2) and which quickly disappear in the paramagnetic phase upon warming above TQ.