μsR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC2

A. Bhattacharyya; D. T. Adroja; A. M. Strydom; A. D. Hillier; J. W. Taylor; A. Thamizhavel; S. K. Dhar; W. A. Kockelmann; B. D. Rainford

doi:10.1103/PhysRevB.90.054405

μsR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC2

A. Bhattacharyya, D. T. Adroja, A. M. Strydom, A. D. Hillier, J. W. Taylor, A. Thamizhavel, S. K. Dhar, W. A. Kockelmann, B. D. Rainford

Physics

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Abstract

The magnetic state of the noncentrosymmetric antiferromagnet CeNiC2 has been studied by magnetic susceptibility, heat capacity, muon spin relaxation (μSR), and inelastic neutron scattering (INS) measurements. CeNiC2 exhibits three magnetic phase transitions at TN1=19.5 K, TN2=10 K, and TN3=2.5 K. The presence of long-range magnetic order below 20 K is confirmed by the observation of oscillations in the μSR spectra between 10 and 20 K and a sharp increase in the muon depolarization rate. INS studies reveal two well-defined crystal electric field (CEF) excitations around 8 and 30 meV. INS data have been analyzed using a CEF model and the wave functions were evaluated. We also calculated the direction and magnitude of the ground state moment using CEF wave functions and compare the results with that proposed from the neutron diffraction. Our CEF model correctly predicts that the moments order along the b axis (or y axis) and the estimated magnetic moment is 0.687(5)μB, which is higher than the moment observed from the neutron diffraction (0.25μB/Ce). We attribute the observed reduced moment due to the Kondo screening effect.

Original language	English
Article number	054405
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.90.054405
Publication status	Published - 8 Aug 2014

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Bhattacharyya, A., Adroja, D. T., Strydom, A. M., Hillier, A. D., Taylor, J. W., Thamizhavel, A., Dhar, S. K., Kockelmann, W. A., & Rainford, B. D. (2014). μsR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC2. Physical Review B - Condensed Matter and Materials Physics, 90(5), Article 054405. https://doi.org/10.1103/PhysRevB.90.054405

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abstract = "The magnetic state of the noncentrosymmetric antiferromagnet CeNiC2 has been studied by magnetic susceptibility, heat capacity, muon spin relaxation (μSR), and inelastic neutron scattering (INS) measurements. CeNiC2 exhibits three magnetic phase transitions at TN1=19.5 K, TN2=10 K, and TN3=2.5 K. The presence of long-range magnetic order below 20 K is confirmed by the observation of oscillations in the μSR spectra between 10 and 20 K and a sharp increase in the muon depolarization rate. INS studies reveal two well-defined crystal electric field (CEF) excitations around 8 and 30 meV. INS data have been analyzed using a CEF model and the wave functions were evaluated. We also calculated the direction and magnitude of the ground state moment using CEF wave functions and compare the results with that proposed from the neutron diffraction. Our CEF model correctly predicts that the moments order along the b axis (or y axis) and the estimated magnetic moment is 0.687(5)μB, which is higher than the moment observed from the neutron diffraction (0.25μB/Ce). We attribute the observed reduced moment due to the Kondo screening effect.",

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AU - Bhattacharyya, A.

AU - Adroja, D. T.

AU - Strydom, A. M.

AU - Hillier, A. D.

AU - Taylor, J. W.

AU - Thamizhavel, A.

AU - Dhar, S. K.

AU - Kockelmann, W. A.

AU - Rainford, B. D.

PY - 2014/8/8

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N2 - The magnetic state of the noncentrosymmetric antiferromagnet CeNiC2 has been studied by magnetic susceptibility, heat capacity, muon spin relaxation (μSR), and inelastic neutron scattering (INS) measurements. CeNiC2 exhibits three magnetic phase transitions at TN1=19.5 K, TN2=10 K, and TN3=2.5 K. The presence of long-range magnetic order below 20 K is confirmed by the observation of oscillations in the μSR spectra between 10 and 20 K and a sharp increase in the muon depolarization rate. INS studies reveal two well-defined crystal electric field (CEF) excitations around 8 and 30 meV. INS data have been analyzed using a CEF model and the wave functions were evaluated. We also calculated the direction and magnitude of the ground state moment using CEF wave functions and compare the results with that proposed from the neutron diffraction. Our CEF model correctly predicts that the moments order along the b axis (or y axis) and the estimated magnetic moment is 0.687(5)μB, which is higher than the moment observed from the neutron diffraction (0.25μB/Ce). We attribute the observed reduced moment due to the Kondo screening effect.

AB - The magnetic state of the noncentrosymmetric antiferromagnet CeNiC2 has been studied by magnetic susceptibility, heat capacity, muon spin relaxation (μSR), and inelastic neutron scattering (INS) measurements. CeNiC2 exhibits three magnetic phase transitions at TN1=19.5 K, TN2=10 K, and TN3=2.5 K. The presence of long-range magnetic order below 20 K is confirmed by the observation of oscillations in the μSR spectra between 10 and 20 K and a sharp increase in the muon depolarization rate. INS studies reveal two well-defined crystal electric field (CEF) excitations around 8 and 30 meV. INS data have been analyzed using a CEF model and the wave functions were evaluated. We also calculated the direction and magnitude of the ground state moment using CEF wave functions and compare the results with that proposed from the neutron diffraction. Our CEF model correctly predicts that the moments order along the b axis (or y axis) and the estimated magnetic moment is 0.687(5)μB, which is higher than the moment observed from the neutron diffraction (0.25μB/Ce). We attribute the observed reduced moment due to the Kondo screening effect.

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μsR and inelastic neutron scattering investigations of the noncentrosymmetric antiferromagnet CeNiC2

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