Antiferromagnetic order in the honeycomb Kondo lattice CePt6Al3 induced by Pd substitution

R. Oishi, K. Umeo, Y. Shimura, T. Onimaru, A. M. Strydom, T. Takabatake

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1 Citation (Scopus)

Abstract

The cerium-based compound CePt6Al3, in which Ce atoms form a honeycomb lattice hosting magnetic frustration, has a heavy-fermion ground state. We have observed development of magnetic order in partially Pd-substituted Ce(Pt1-xPdx)6Al3 series up to x = 0.3 by the measurements of magnetic susceptibility, electrical resistivity ρ, and specific heat C. In the whole range of x, the unit cell volume remains unchanged within 0.2%, and the effective magnetic moment stays at 2.4μB/Ce. For x = 0.05, both C/T and ρ(T) jump on cooling at Tm=1.8K. With increasing x to 0.2, Tm increases to 3.8 K, where C/T shows a pronounced λ-type anomaly. Application of magnetic fields suppresses Tm, which is indicative of an antiferromagnetic (AFM) ordered state. Thus, a long-range AFM order is induced by the substitution of isovalent Pd for Pt in CePt6Al3 without carrier doping and chemical pressure. We attribute the emergence of AFM order in Ce(Pt1-xPdx)6Al3 to the randomness in the spin-orbit interaction in the Pt-Pd sublattice, which weakens both the coherent Kondo effect and magnetic frustration in the honeycomb Kondo lattice.

Original languageEnglish
Article number104411
JournalPhysical Review B
Volume104
Issue number10
DOIs
Publication statusPublished - 1 Sept 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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