Kondo behaviour of the solid solution (Ce1-xLax)PtGa

F. C. Ragel; P. De V. Du Plessis; A. M. Strydom

doi:10.1016/j.jpcs.2010.08.010

Kondo behaviour of the solid solution (Ce_1-xLa_x)PtGa

F. C. Ragel, P. De V. Du Plessis, A. M. Strydom

Physics

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The solid solution (Ce_1-xLa_x)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (C_P(T)) measurements. The Nel temperature (T_N=3.3 K) for CePtGa is lowered upon La substitution as observed from χ(T) and ρ(T) measurements. The Kondo temperature T_K as calculated from MR measurements is comparable to T_N and also decreases with La substitution. The volume dependence of T_K is in accordance with the compressible Kondo lattice model and a Doniach diagram of the results is presented. C_P(T) measurements are presented for CePtGa, Ce _0.2La_0.8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties. Other features of interest are anomalies in ρ(T) and C_P(T) due to crystalline electric field effects and metamagnetism as observed in σ(B) studies for samples with 0≤x≤ 0.3.

Original language	English
Pages (from-to)	1694-1701
Number of pages	8
Journal	Journal of Physics and Chemistry of Solids
Volume	71
Issue number	12
DOIs	https://doi.org/10.1016/j.jpcs.2010.08.010
Publication status	Published - Dec 2010

Keywords

A. Magnetic materials
D. Magnetic properties
D. Specific heat
D. Transport properties

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2010.08.010

Cite this

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title = "Kondo behaviour of the solid solution (Ce1-xLax)PtGa",

abstract = "The solid solution (Ce1-xLax)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (CP(T)) measurements. The Nel temperature (TN=3.3 K) for CePtGa is lowered upon La substitution as observed from χ(T) and ρ(T) measurements. The Kondo temperature TK as calculated from MR measurements is comparable to TN and also decreases with La substitution. The volume dependence of TK is in accordance with the compressible Kondo lattice model and a Doniach diagram of the results is presented. CP(T) measurements are presented for CePtGa, Ce 0.2La0.8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties. Other features of interest are anomalies in ρ(T) and CP(T) due to crystalline electric field effects and metamagnetism as observed in σ(B) studies for samples with 0≤x≤ 0.3.",

keywords = "A. Magnetic materials, D. Magnetic properties, D. Specific heat, D. Transport properties",

author = "Ragel, {F. C.} and {Du Plessis}, {P. De V.} and Strydom, {A. M.}",

year = "2010",

month = dec,

doi = "10.1016/j.jpcs.2010.08.010",

language = "English",

volume = "71",

pages = "1694--1701",

journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Kondo behaviour of the solid solution (Ce1-xLax)PtGa

AU - Ragel, F. C.

AU - Du Plessis, P. De V.

AU - Strydom, A. M.

PY - 2010/12

Y1 - 2010/12

N2 - The solid solution (Ce1-xLax)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (CP(T)) measurements. The Nel temperature (TN=3.3 K) for CePtGa is lowered upon La substitution as observed from χ(T) and ρ(T) measurements. The Kondo temperature TK as calculated from MR measurements is comparable to TN and also decreases with La substitution. The volume dependence of TK is in accordance with the compressible Kondo lattice model and a Doniach diagram of the results is presented. CP(T) measurements are presented for CePtGa, Ce 0.2La0.8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties. Other features of interest are anomalies in ρ(T) and CP(T) due to crystalline electric field effects and metamagnetism as observed in σ(B) studies for samples with 0≤x≤ 0.3.

AB - The solid solution (Ce1-xLax)PtGa has been studied through X-ray diffraction, magnetization (σ(B)), magnetic susceptibility (χ(T)), electrical resistivity (ρ(T)), magnetoresistivity (MR) and heat capacity (CP(T)) measurements. The Nel temperature (TN=3.3 K) for CePtGa is lowered upon La substitution as observed from χ(T) and ρ(T) measurements. The Kondo temperature TK as calculated from MR measurements is comparable to TN and also decreases with La substitution. The volume dependence of TK is in accordance with the compressible Kondo lattice model and a Doniach diagram of the results is presented. CP(T) measurements are presented for CePtGa, Ce 0.2La0.8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties. Other features of interest are anomalies in ρ(T) and CP(T) due to crystalline electric field effects and metamagnetism as observed in σ(B) studies for samples with 0≤x≤ 0.3.

KW - A. Magnetic materials

KW - D. Magnetic properties

KW - D. Specific heat

KW - D. Transport properties

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DO - 10.1016/j.jpcs.2010.08.010

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