Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 60: Correlated Electrons: f-Electron Systems
TT 60.5: Vortrag
Donnerstag, 23. März 2017, 10:30–10:45, HSZ 201
Magnetic field dependence of spin excitations in CeB6 — P. Y. Portnichenko1, S. V. Demishev2, A. V. Semeno2, H. Ohta3, A. S. Cameron1, M. A. Surmach1, H. Jang4,5, A. V. Dukhnenko6, N. Yu. Shitsevalova6, V. B. Filipov6, A. Schneidewind7, J. Ollivier8, A. Podlesnyak9, and •D. S. Inosov1 — 1TU Dresden, Germany — 2General Physics Institute, Moscow — 3Kobe University, Japan — 4MPI für Festkörperphysik, Stuttgart — 5National Accelerator Lab, Stanford, USA — 6Inst. for Problems of Material Sciences, Kiev, Ukraine — 7Forschungszentrum Jülich, Germany — 8ILL, Grenoble, France — 9SNS, Oak Ridge, USA
We employ inelastic neutron scattering (INS) to study the field dependence of spin fluctuations in CeB6. The exciton shows no field splitting in marked contrast to CeCoIn5. Instead, we observe a second field-induced magnon whose energy increases with field. At the ferromagnetic zone center, however, we find only a single mode with a nonmonotonic field dependence. At low fields, it is initially suppressed to zero together with the antiferromagnetic order parameter, but then reappears at higher fields inside the hidden-order phase, following the energy of an electron spin resonance (ESR). This is a unique example of a ferromagnetic resonance in a heavy-fermion metal seen by both ESR and INS consistently over a broad range of magnetic fields.