Evolution of the partially frustrated magnetic order in CePd1−xNixAl

Zita Huesges, Stefan Lucas, Sarah Wunderlich, Fabiano Yokaichiya, Karel Prokeš, Karin Schmalzl, Marie-Hélène Lemée-Cailleau, Bjørn Pedersen, Veronika Fritsch, Hilbert v. Löhneysen, Oliver Stockert
2017 Physical review B  
We report on a single-crystal neutron diffraction study of the evolution of the antiferromagnetic order in the heavy-fermion compound CePd_1-xNi_xAl which exhibits partial geometric frustration due to its distorted Kagomé structure. The magnetic structure is found to be unchanged with a propagation vector Q_AF≈ (0.5 0 0.35) for all Ni concentrations x up to x_c ≈ 0.14. Upon approaching the quantum critical concentration x_c, the ordered moment vanishes linearly with Néel temperature T_ N, in
more » ... d agreement with CePdAl under hydrostatic pressure. For all Ni concentrations, substantial short-range magnetic correlations are observed above T_ N as a result of frustration.
doi:10.1103/physrevb.96.144405 fatcat:zejjphujabfdjmnscmcqh56bjm