Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: f-Electron Systems and Heavy Fermions 2

TT 42.2: Vortrag

Mittwoch, 18. März 2020, 15:15–15:30, HSZ 204

Field-angle resolved magnetic excitations as a probe of hidden-order symmetry in CeB6 — •Pavlo Y. Portnichenko1, Alireza Akbari2, Stanislav E. Nikitin3, Alistair S. Cameron1, Natalya Yu. Shitsevalova4, Igor Radelytskyi5, Astrid Schneidewind5, Zita Hüsges6, Jianhui Xu6, Alexandre Ivanov7, Jean-Michel Mignot8, Peter Thalmeier3, and Dmytro S. Inosov11TU Dresden, Germany — 2APCTP Pohang, Korea — 3MPI-CPfS Dresden, Germany — 4IMPS, Kiev, Ukraine — 5JCNS, Jülich, Germany — 6HZB, Berlin, Germany — 7ILL, France — 8LLB, France

The heavy-fermion compound CeB6 and its La-diluted alloys are among the best-studied realizations of the long-range multipolar phases, often referred to as “hidden order”. Previously the hidden order in phase II was identified as primary antiferroquadrupolar and field-induced octupolar order. Here we present a combined experimental and theoretical investigation of collective excitations in the phase II of CeB6. Inelastic neutron scattering in fields up to 16.5 T reveals a new high-energy mode above 14 T in addition to the low-energy magnetic excitations. The experimental dependence of their energy on the magnitude and angle of the applied magnetic field is compared to the results of a multipolar interaction model. We show that the rotating-field technique at fixed momentum can complement conventional INS measurements of the dispersion at constant field and holds great promise for identifying the symmetry of multipolar order parameters and the details of inter-multipolar interactions.

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