Antiferromagnetic ordering in heavy fermion system Ce2Au2Cd

TL;DR

This study reports the synthesis and characterization of Ce2Au2Cd, revealing antiferromagnetic order at 5 K and heavy fermion behavior with a high electronic specific heat coefficient, highlighting its complex magnetic and electronic properties.

Contribution

The paper presents the first detailed analysis of magnetic ordering and heavy fermion behavior in Ce2Au2Cd, a new intermetallic compound with unique magnetic properties.

Findings

Ce2Au2Cd exhibits antiferromagnetic ordering at 5 K.

Ce2Au2Cd shows heavy fermion behavior with a high gamma value.

Magnetization measurements reveal a metamagnetic transition at 3 K.

Abstract

La2Au2Cd and Ce2Au2Cd were prepared from the elements by reactions in sealed tantalum tubes in a water-cooled sample chamber of an induction furnace. These intermetallics crystallize with the tetragonal Mo2FeB2 type, space group P4/mbm. While La2Au2Cd is Pauli paramagnetic, Ce2Au2Cd shows Curie-Weiss behaviour above 100 K with an experimental magnetic moment of 2.41(2) muB/Ce atom, indicating trivalent cerium. Antiferromagnetic ordering is detected for Ce2Au2Cd at 5.01(2) K and magnetization measurements reveal a metamagnetic transition at 3 K at a critical field of around 20 kOe with a saturation moment of 1.50(2)muB/Ce atom at 80 kOe. The low-temperature heat capacity properties characterize Ce2Au2Cd as a heavy fermion material with an electronic specific heat coefficient (gamma) = 807(5) mJ/mol K2 as compared to La2Au2Cd with gamma = 6(5) mJ/mol K2.