A comparison of the structure and localized magnetism in Ce2PdGa12 with the heavy fermion CePdGa6

Abstract

Single crystals of Ce 2 PdGa 12 have been synthesized in Ga flux and characterized by X-ray diffraction. This compound crystallizes in the tetragonal P4=nbm space group, Z ¼ 2 with lattice parameters of a ¼ 6:1040ð2ÞÅ and c ¼ 15:5490ð6ÞÅ. It shows strongly anisotropic magnetism and orders antiferromagnetically at T N $11 K. A field-induced metamagnetic transition to the ferromagnetic state is observed below T N . Structure-property relationships with the related heavy-fermion antiferromagnet CePdGa 6 are discussed.

Crystal growth, structure, and physical properties of Ln2PdGa12 (Ln=La, Pr, Nd, and Sm)

“…However, near H ∼ 3 T, we observe a sudden change in slope associated with a metamagnetic transition that is slightly hysteretic. The metamagnetic transition is consistent with those observed for Ln 2 MGa 12 (Ln = Ce-Nd, M = Pd, Ni, and Cu) and is reminiscent of a spin-flip transition from an antiferromagnetic state at low fields to a spin re-orientation at higher applied fields [5,7,8], i.e. in this case, an abrupt aligning of all the spins along the c-axis.…”

“…antiferromagnetic between planes along the c-axis [5]. A similar structure could be present here; however, additional measurements would have to be performed to verify the magnetic structure.…”

“…The discovery of these phases led our group to investigate whether similar phases could be found in the Ce-Pd-Ga phase space. Three new phases were discovered: CePdGa 6 [4], Ce 2 PdGa 12 [5], and Ce 2 PdGa 10 [6]. All three structure types are tetragonal and can be described as layers of cerium and gallium resembling those found in the HoCoGa 5 structure type compounds [1].…”

Physical properties and crystal chemistry of Ce2Ga12Pt

“…Thus the transition metals should be also suitable for fixing of the cubic environment also in the multi-component structures. For the RE 2 Ga 12 T M x compounds it was first find as a substructure of La 2 Ga 12 Ni 1.2 (around z = 0.0 and z = 0.5, figure 2, bottom right) [7] and further for the representatives of Sm 2 Ga 12 Ni type (around z = 0.0) [5,12]. The disorder in the region 0.4 < z < 0.6 seems to be characteristic for the representatives of the Sm 2 Ga 12 Ni type.…”

“…The 4f contribution to the specific heat, C 4f (T), of Ce 2 Ga 12 Pt was obtained by subtracting the phonon contribution, which was estimated from the literature values of the nonmagnetic La 2 Ga 12 Pd [5], yielding…”