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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.7: Poster
Wednesday, April 2, 2014, 15:00–19:00, P2
Magnetic excitations in quantum-critical Ce(Pd0.86Ni0.14)Al — •O. Stockert1, K. Schmalzl2, V. Fritsch3, and H. v. Löhneysen3 — 1Max-Planck-Institut CPfS, Dresden, Germany — 2Forschungszentrum Jülich, Jülich Centre for Neutron Science at Institut Laue-Langevin, Grenoble, France — 3Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany
The heavy-fermion compound CePdAl offers the opportunity to study quantum criticality in the presence of geometrical frustration. The antiferromagnetic order in CePdAl decreases strongly when substituting nickel for palladium and a quantum critical point is approached in CePd1−xNixAl for x = 0.14. We performed extensive inelastic neutron scattering to study the low-energy magnetic excitations in Ce(Pd0.86Ni0.14)Al, i.e., the alloy where magnetic order is just suppressed. We find spin fluctuations being broad in q-space indicating only short-range dynamic spin correlations. We discuss their q-space and temperature dependence and will compare the results to the spin excitations in the magnetically ordered parent compound CePdAl.