Chemical pressure and magnetic field effects in CePtGa

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

doi:10.1088/0953-8984/19/50/506211

Chemical pressure and magnetic field effects in CePtGa

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

Physics

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

4 Citations (Scopus)

Abstract

The antiferromagnetic Kondo compound CePtGa and the Ce(Pt _1-xNi_x)Ga and CePt(Ga_1-yAl_y) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples to temperatures as low as 1.5K and in magnetic fields up to 9T. A Doniach diagram is presented of the volume dependences of the Néel temperature T_N and Kondo temperature T_K of these alloys and the possible existence of a quantum critical point near x = 0.38 is indicated. χ(T) measurements in different applied fields indicate a marked decrease in T_N with field for the parent CePtGa compound and extrapolation of the results suggests that magnetic order should disappear in a field of 4.8T. In contrast the Kondo energy scale, identified by a maximum in ρ(T) at low temperatures, increases significantly with field.

Original language	English
Article number	506211
Journal	Journal of Physics Condensed Matter
Volume	19
Issue number	50
DOIs	https://doi.org/10.1088/0953-8984/19/50/506211
Publication status	Published - 19 Dec 2007

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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title = "Chemical pressure and magnetic field effects in CePtGa",

abstract = "The antiferromagnetic Kondo compound CePtGa and the Ce(Pt 1-xNix)Ga and CePt(Ga1-yAly) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples to temperatures as low as 1.5K and in magnetic fields up to 9T. A Doniach diagram is presented of the volume dependences of the N{\'e}el temperature TN and Kondo temperature TK of these alloys and the possible existence of a quantum critical point near x = 0.38 is indicated. χ(T) measurements in different applied fields indicate a marked decrease in TN with field for the parent CePtGa compound and extrapolation of the results suggests that magnetic order should disappear in a field of 4.8T. In contrast the Kondo energy scale, identified by a maximum in ρ(T) at low temperatures, increases significantly with field.",

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T1 - Chemical pressure and magnetic field effects in CePtGa

AU - Ragel, F. C.

AU - Du Plessis, P. De V.

AU - Strydom, A. M.

PY - 2007/12/19

Y1 - 2007/12/19

N2 - The antiferromagnetic Kondo compound CePtGa and the Ce(Pt 1-xNix)Ga and CePt(Ga1-yAly) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples to temperatures as low as 1.5K and in magnetic fields up to 9T. A Doniach diagram is presented of the volume dependences of the Néel temperature TN and Kondo temperature TK of these alloys and the possible existence of a quantum critical point near x = 0.38 is indicated. χ(T) measurements in different applied fields indicate a marked decrease in TN with field for the parent CePtGa compound and extrapolation of the results suggests that magnetic order should disappear in a field of 4.8T. In contrast the Kondo energy scale, identified by a maximum in ρ(T) at low temperatures, increases significantly with field.

AB - The antiferromagnetic Kondo compound CePtGa and the Ce(Pt 1-xNix)Ga and CePt(Ga1-yAly) alloy systems have been studied by resistivity ρ(T), magnetoresistivity MR and susceptibility χ(T) measurements on polycrystalline samples to temperatures as low as 1.5K and in magnetic fields up to 9T. A Doniach diagram is presented of the volume dependences of the Néel temperature TN and Kondo temperature TK of these alloys and the possible existence of a quantum critical point near x = 0.38 is indicated. χ(T) measurements in different applied fields indicate a marked decrease in TN with field for the parent CePtGa compound and extrapolation of the results suggests that magnetic order should disappear in a field of 4.8T. In contrast the Kondo energy scale, identified by a maximum in ρ(T) at low temperatures, increases significantly with field.

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JO - Journal of Physics Condensed Matter

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Chemical pressure and magnetic field effects in CePtGa

Abstract

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