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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. Jang^4,5, 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.