Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.7: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Magnetic excitations in quantum-critical Ce(Pd_0.86Ni_0.14)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 CePd_1−xNi_xAl for x = 0.14. We performed extensive inelastic neutron scattering to study the low-energy magnetic excitations in Ce(Pd_0.86Ni_0.14)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.