Evolution from 4f-electron antiferromagnetic to ferromagnetic order in the CeCu(Ge1−xSnx) alloy series (0≤x≤1)

A. Altayeb; B. M. Sondezi; M. B. Tchoula Tchokonté; A. M. Strydom; T. B. Doyle; D. Kaczorowski

doi:10.1063/1.4977019

Evolution from 4f-electron antiferromagnetic to ferromagnetic order in the CeCu(Ge1−xSnx) alloy series (0≤x≤1)

A. Altayeb, B. M. Sondezi, M. B. Tchoula Tchokonté, A. M. Strydom, T. B. Doyle, D. Kaczorowski

Physics

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Abstract

We report the evolution from ferromagnetic (FM) to antiferromagnetic (AFM) state in CeCu(Ge1−xSnx) investigated by means of magnetic and heat capacity measurements. X-ray diffraction studies for all compositions indicate the ZrBeSi - type hexagonal crystal structure with space group P6₃/mmc (No. 194). The magnetic susceptibility, χ(T) at high temperature follows the Curie - Weiss relation with an effective magnetic moment close to the value of 2.54 μB expected for free Ce3+ - ion. At low temperatures, χ(T) data indicate AFM transition for alloys in the concentration range 0.7≤x≤1 and FM for x≤0.6. The magnetization, M(μ0H) of samples exhibiting AFM behaviour shows metamagnetic transition at low magnetic fields with some irreversibility in the process of increasing and decreasing magnetic field. In turn, M(μ0H) of samples exhibiting FM behaviour shows saturation in high magnetic fields. Heat capacity, C_p(T) data confirm the AFM and FM transitions observed in magnetic measurements. An additional anomaly below T_C and T_N is observed in C_p(T)/T, which likely arises from spin reorientation or rearrangement in FM or AFM structure. Below in FM region, C_p(T) can be well described assuming spin-waves excitations with an energy gap ΔC.

Original language	English
Article number	055714
Journal	AIP Advances
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.4977019
Publication status	Published - 1 May 2017

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General Physics and Astronomy

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title = "Evolution from 4f-electron antiferromagnetic to ferromagnetic order in the CeCu(Ge1−xSnx) alloy series (0≤x≤1)",

abstract = "We report the evolution from ferromagnetic (FM) to antiferromagnetic (AFM) state in CeCu(Ge1−xSnx) investigated by means of magnetic and heat capacity measurements. X-ray diffraction studies for all compositions indicate the ZrBeSi - type hexagonal crystal structure with space group P63/mmc (No. 194). The magnetic susceptibility, χ(T) at high temperature follows the Curie - Weiss relation with an effective magnetic moment close to the value of 2.54 μB expected for free Ce3+ - ion. At low temperatures, χ(T) data indicate AFM transition for alloys in the concentration range 0.7≤x≤1 and FM for x≤0.6. The magnetization, M(μ0H) of samples exhibiting AFM behaviour shows metamagnetic transition at low magnetic fields with some irreversibility in the process of increasing and decreasing magnetic field. In turn, M(μ0H) of samples exhibiting FM behaviour shows saturation in high magnetic fields. Heat capacity, Cp(T) data confirm the AFM and FM transitions observed in magnetic measurements. An additional anomaly below TC and TN is observed in Cp(T)/T, which likely arises from spin reorientation or rearrangement in FM or AFM structure. Below in FM region, Cp(T) can be well described assuming spin-waves excitations with an energy gap ΔC.",

author = "A. Altayeb and Sondezi, {B. M.} and {Tchoula Tchokont{\'e}}, {M. B.} and Strydom, {A. M.} and Doyle, {T. B.} and D. Kaczorowski",

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AU - Altayeb, A.

AU - Sondezi, B. M.

AU - Tchoula Tchokonté, M. B.

AU - Strydom, A. M.

AU - Doyle, T. B.

AU - Kaczorowski, D.

PY - 2017/5/1

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N2 - We report the evolution from ferromagnetic (FM) to antiferromagnetic (AFM) state in CeCu(Ge1−xSnx) investigated by means of magnetic and heat capacity measurements. X-ray diffraction studies for all compositions indicate the ZrBeSi - type hexagonal crystal structure with space group P63/mmc (No. 194). The magnetic susceptibility, χ(T) at high temperature follows the Curie - Weiss relation with an effective magnetic moment close to the value of 2.54 μB expected for free Ce3+ - ion. At low temperatures, χ(T) data indicate AFM transition for alloys in the concentration range 0.7≤x≤1 and FM for x≤0.6. The magnetization, M(μ0H) of samples exhibiting AFM behaviour shows metamagnetic transition at low magnetic fields with some irreversibility in the process of increasing and decreasing magnetic field. In turn, M(μ0H) of samples exhibiting FM behaviour shows saturation in high magnetic fields. Heat capacity, Cp(T) data confirm the AFM and FM transitions observed in magnetic measurements. An additional anomaly below TC and TN is observed in Cp(T)/T, which likely arises from spin reorientation or rearrangement in FM or AFM structure. Below in FM region, Cp(T) can be well described assuming spin-waves excitations with an energy gap ΔC.

AB - We report the evolution from ferromagnetic (FM) to antiferromagnetic (AFM) state in CeCu(Ge1−xSnx) investigated by means of magnetic and heat capacity measurements. X-ray diffraction studies for all compositions indicate the ZrBeSi - type hexagonal crystal structure with space group P63/mmc (No. 194). The magnetic susceptibility, χ(T) at high temperature follows the Curie - Weiss relation with an effective magnetic moment close to the value of 2.54 μB expected for free Ce3+ - ion. At low temperatures, χ(T) data indicate AFM transition for alloys in the concentration range 0.7≤x≤1 and FM for x≤0.6. The magnetization, M(μ0H) of samples exhibiting AFM behaviour shows metamagnetic transition at low magnetic fields with some irreversibility in the process of increasing and decreasing magnetic field. In turn, M(μ0H) of samples exhibiting FM behaviour shows saturation in high magnetic fields. Heat capacity, Cp(T) data confirm the AFM and FM transitions observed in magnetic measurements. An additional anomaly below TC and TN is observed in Cp(T)/T, which likely arises from spin reorientation or rearrangement in FM or AFM structure. Below in FM region, Cp(T) can be well described assuming spin-waves excitations with an energy gap ΔC.

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Evolution from 4f-electron antiferromagnetic to ferromagnetic order in the CeCu(Ge1−xSnx) alloy series (0≤x≤1)

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