Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: f-Electron Systems and Heavy Fermions I

TT 5.3: Vortrag

Montag, 12. März 2018, 10:00–10:15, H 3005

Doping-induced redistribution of magnetic spectral weight in substituted hexaborides Ce1xLaxB6 and Ce0.7Nd0.3B6 — •S. E. Nikitin1,2, P. Y. Portnichenko2, A. V. Dukhnenko3, N. Yu. Shitsevalova3, V. B. Filipov3, Y. Qiu4, J. A. Rodriguez-Rivera4,5, J. Ollivier6, and D. S. Inosov21MPI CPfS, Dresden, Germany — 2TU Dresden, Germany — 3I.M. Frantsevich Inst. for Problems of Materials Sci. of NAS, Kiev, Ukraine — 4NIST Center for Neutron Research, Maryland, USA — 5University of Maryland, USA — 6ILL, Grenoble, France

CeB6 is a model example of intriguing heavy-fermion physics. At zero field it exhibits a complex magnetic phase diagram with antiferromagnetic (AFM) and “hidden order” phases, which is associated with the ordering of Ce3+ antiferroquadrupolar (AFQ) moments. Our recent ARPES and INS measurements have shown that both propagation vectors of AFQ and AFM phases are dictated by the nesting instability of the Fermi-surface. In this work we have extended this approach to probe the evolution of the electronic properties cerium hexaboride upon La and Nd substitutions. We observe that strong diffuse peak at the corner of the Brillouin zone, which coincides with the propagation vector of the elusive AFQ order in CeB6, is rapidly suppressed by both La and Nd doping, like the AFQ order itself and the corresponding spectral weight is transferred to the X(1/200) point. Our results provide direct evidence that the complex magnetic phase diagrams of substituted hexaborides are dictated by the evolution of the Fermi-surface upon effective “hole”-like doping.

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