Many of interesting properties observed in Ce and Yb-based compounds are understood by c-f interactions, and d-f interaction can be negligible. But there are compounds in which the d-f interaction plays a non-negligible role as CePt₃ or YbAl₃ [1, 2]. Our attention is focused on one of this kind of compounds. YbCo₂ belongs to RCo₂ series (R-rare earth element) which possess strong d-f electron interaction and are strong magnets. We performed detailed study of rarely known YbCo₂ compound which is expected to be magnetic. Our results bring evidence of low temperature magnetic anomaly in measurement of specific heat, electrical resistivity and magnetization which will be presented together with the discussion about the origin.

References:
[1] Goremychkin E A et al 2018 Science 359 186
[2] Cornelius A L et al 2002 Phys. Rev. Lett. 88 117201