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Field-induced order in heavy-fermion compound YbCo$$_2$$Zn$$_{20}$$

Kaneko, Koji  ; Raymond, S.*; Ressouche, E.*; Lapertot, G.*; Takeuchi, Tetsuya*; Hirose, Yusuke*; Honda, Fuminori*; Onuki, Yoshichika

YbCo$$_2$$Zn$$_{20}$$ has a heavy-fermion ground state with an enormously large Sommerfeld coefficient of 8 J/molK$$^2$$, and that is sensitive to external fields. Whereas pressure induces antiferromagnetic order, magnetic field induces metamagnetic transitions around 0.5 T, and new ordered state appears above 6 T for $$B{parallel}{langle}111{rangle}$$. In order to get insights into electronic states and its magnetic field response, neutron scattering experiments on single crystalline samples were carried. In a field-induced phase, magnetic reflections were successfully observed, which has a different propagation vector to that of pressure induced phase. Inelastic neutron scattering probes a crystal-field excitation at a low excitation energy which overlaps to quasielastic response. The results suggest degenerated energy scale, and that leads to variety of external response in YbCo$$_2$$Zn$$_{20}$$.

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