Studying of the order parameter of a phase IV in Ce0.5La0.5B6.
The heavy fermion material Ce(1-x)La(x)B6 has a complex phase diagram combining antiferro-quadrupolar and antiferromagnetic phases, and its underlying physics is still poorly understood in spite of extensive studies. In our recent inelastic neutron cattering experiments, we have discovered several novel features in the magnetic excitation spectrum. In a number of recent experiments on the pure CeB6 compound, we have revealed strong quasielastic intensity in the normal (paramagnetic) state with a rich momentum-space structure. Below the antiferromagnetic transition temperature, TN = 2.3 K, this intensity gave rise to sharp collective modes. Substitution with nonmagnetic lanthanum in Ce(1-x)La(x)B6 leads to a suppression of the AFM phase with a critical doping level xc = 0.3%, where the transition into a mysterious phase IV instead of the paramagnetic phase at zero temperature occurs. The order parameter of phase IV remains an open issue although octupolar ordering was suggested. Therefore, in this proposal, we suggest to study order parameter of a phase IV on a sample with even higher La concentration Ce0.5La0.5B6, using ThALES.
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PORTNICHENKO Pavlo; BRANDO Manuel; CAMERON Alistair; Dmytro Inosov; IVANOV Alexandre; JANG Dongjin and Maksym Surmach. (2016). Studying of the order parameter of a phase IV in Ce0.5La0.5B6.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1525
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