Magnetic Phase Diagram of the new Heavy Fermion Compound Ce2PtIn8

TL;DR

This paper reports the discovery and detailed investigation of a new heavy fermion compound Ce2PtIn8, revealing its magnetic properties, phase transitions, and potential quantum phase transition behavior.

Contribution

It introduces Ce2PtIn8 as a new compound with unique magnetic and structural properties, expanding the understanding of heavy fermion systems.

Findings

Ce2PtIn8 orders antiferromagnetically below 2.1 K.

An order-to-order transition occurs at 2 K.

The phase diagram suggests a pressure-induced quantum phase transition.

Abstract

We report on the discovery and investigation of a new 218 heavy fermion compound. Crystals have been synthesized from In-flux. Structurally, Ce2PtIn8 is located between the cubic CeIn3 and the more two-dimensional CeTIn5 (T = transition metal) type of compounds. The weak anisotropy of the paramagnetic susceptibility suggests rather 3D magnetic correlations. Specific heat, electrical resistivity and magnetization measurements revealed that Ce2PtIn8 orders antiferromagnetically below Tn = 2.1 K. An order-to-order transition is observed at Tm = 2 K. Similarities in the H - T phase diagram to other CenTmIn3n+2m (T = Rh, Pt) compounds point to a pressure-induced quantum phase transition (QPT) which, according to the tentative location of Ce2PtIn8 in the recent proposed global phase diagram for QPT, would be of spin density wave type.