Magnetic, thermal, and transport properties on single crystals of antiferromagnetic Kondo-lattice Ce2PdSi3

TL;DR

This study investigates the magnetic, thermal, and transport properties of single-crystal Ce2PdSi3, revealing its antiferromagnetic order, heavy-fermion behavior, and anisotropic electronic characteristics influenced by crystal electric fields and Kondo effects.

Contribution

It provides detailed experimental insights into the anisotropic magnetic and transport properties of Ce2PdSi3, highlighting the interplay between Kondo effect and magnetic order in this heavy-fermion compound.

Findings

Ce2PdSi3 orders antiferromagnetically below ~3 K.

The compound exhibits heavy-fermion behavior with a Sommerfeld coefficient of about 110 mJ/K^2 mol Ce.

Transport and magnetic properties show large anisotropy and interplay between CEF and Kondo effects.

Abstract

Magnetization, heat capacity, electrical resistivity, thermoelectric power, and Hall effect have been investigated on single-crystalline Ce_2PdSi_3. This compound is shown to order antiferromagnetically below N'eel temperature (T_N) \~3 K. The Sommerfeld coefficient far below T_N is found to be about 110 mJ/K^2 mol Ce, which indicates the heavy-fermion character of this compound. The transport and magnetic properties exhibit large anisotropy with an interplay between crystalline-electric-field (CEF) and Kondo effects. The sign of thermoelectric power is opposite for different directions at high temperatures and the ordinary Hall coefficient is anisotropic with opposite sign for different geometries, indicating the anisotropic Fermi surface. The CEF analysis from the temperature dependence of magnetic susceptibility suggests that the ground state is |+/-1/2>. The first and the second excited CEF doublet levels are found to be located at about 30 and 130 K, respectively. The Kondo temperature is estimated to be the same order as T_N, indicating the presence of a delicate competition between the Kondo effect and magnetic order.