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We have synthesized two new interstitial compounds (RPd3)8Mn (R = La and Ce).The Mn ions present in "dilute" concentration of just 3 molar percent form asublattice with an unusually large Mn-Mn near neighbor distance of ~ 85 nm.While the existence of (RPd3)8M (where M is a p-block element) is alreadydocumented in the literature, the present work reports for the first time theformation of this phase with M being a 3d element. In (LaPd3)8Mn, the Mnsub-lattice orders antiferromagnetically as inferred from the peaks inlow-field magnetization at 48 K and 23 K. The latter peak progressively shiftstowards lower temperatures in increasing magnetic field and disappears below1.8 K in a field of ~ 8 kOe. On the other hand in (CePd3)8Mn the Mn sublatticeundergoes a ferromagnetic transition around 35 K. The Ce ions form a denseKondo-lattice and are in a paramagnetic state at least down to 1.5 K. Astrongly correlated electronic ground state arising from Kondo effect isinferred from the large extrapolated value of C/T = 275 mJ/Ce-mol K^2 at T = 0K. In contrast, the interstitial alloys RPd3Mnx (x = 0.03 and 0.06), alsosynthesized for the first time, have a spin glass ground state due to therandom distribution of the Mn ions over the available "1b" sites in the parentRPd3 crystal lattice.Comment: 18 figures and 20 pages of text documen

physical review. b, condensed matter

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Magnetic ordering of the Mn sublattice: Dense Kondo-lattice behavior of Ce in(RPd3)8Mn