Magnetic-field dependence of the ferromagnetic excitation in the heavy-fermion metal CeB6
The heavy fermion material CeB6 has a complex phase diagram combining antiferro-quadrupolar (AFQ) and antiferromagnetic (AFM) phases, and its underlying physics is still poorly understood in spite of extensive studies. In our recent inelastic neutron scattering experiments, we have discovered several novel features in the magnetic excitation spectrum in the parent CeB6. Intense ferromagnetic (FM) low-energy collective mode, that dominates the magnetic excitation spectrum of CeB6 in the AFM phase, is suppressed by the weak magnetic field to zero together with the AFM order parameter. At higher fields inside the hidden-order AFQ phase this excitation reappears following the energy of an electron spin resonance (ESR). To fully understand the complex phase diagram, further INS measurements are essential. In this experiment we expect to find the second spin exciton seen in ESR experiment. We will observe the evolution of low-energy magnetic excitations at the FM wave vector, as a function of the applied magnetic field above 8 T, which can be directly compared with the existing ESR data on CeB6.
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PORTNICHENKO Pavlo; CAMERON Alistair; Dmytro Inosov; IVANOV Alexandre and NIKITIN Stanislav. (2017). Magnetic-field dependence of the ferromagnetic excitation in the heavy-fermion metal CeB6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1537
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