Vibron quasibound state in the noncentrosymmetric tetragonal heavy-fermion compound CeCuAl 3

D. T. Adroja; A. Del Moral; C. De La Fuente; A. Fraile; E. A. Goremychkin; J. W. Taylor; A. D. Hillier; F. Fernandez-Alonso

doi:10.1103/PhysRevLett.108.216402

Vibron quasibound state in the noncentrosymmetric tetragonal heavy-fermion compound CeCuAl ₃

D. T. Adroja, A. Del Moral, C. De La Fuente, A. Fraile, E. A. Goremychkin, J. W. Taylor, A. D. Hillier, F. Fernandez-Alonso

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Abstract

We have investigated the noncentrosymmetric tetragonal heavy-fermion antiferromagnetic compound CeCuAl ₃ (T _N=2.5K) using inelastic neutron scattering (INS). Our INS results unequivocally reveal the presence of three magnetic excitations centered at 1.3, 9.8, and 20.5 meV. These spectral features cannot be explained within the framework of crystal-electric-field models and recourse to Kramers' theorem for a 4f1 Ce3 ⁺ ion. To overcome these interpretational difficulties, we have generalized the vibron model of Thalmeier and Fulde for cubic CeAl ₂ to tetragonal point-group symmetry with the theoretically calculated vibron form-factor. This extension provides a satisfactory explanation for the position and intensity of the three observed magnetic excitations in CeCuAl ₃, as well as their dependence on momentum transfer and temperature. On the basis of our analysis, we attribute the observed series of magnetic excitations to the existence of a vibron quasibound state.

Original language	English
Article number	216402
Journal	Physical Review Letters
Volume	108
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.108.216402
Publication status	Published - 23 May 2012
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Vibron quasibound state in the noncentrosymmetric tetragonal heavy-fermion compound CeCuAl 3 ",

abstract = "We have investigated the noncentrosymmetric tetragonal heavy-fermion antiferromagnetic compound CeCuAl 3 (T N=2.5K) using inelastic neutron scattering (INS). Our INS results unequivocally reveal the presence of three magnetic excitations centered at 1.3, 9.8, and 20.5 meV. These spectral features cannot be explained within the framework of crystal-electric-field models and recourse to Kramers' theorem for a 4f1 Ce3 + ion. To overcome these interpretational difficulties, we have generalized the vibron model of Thalmeier and Fulde for cubic CeAl 2 to tetragonal point-group symmetry with the theoretically calculated vibron form-factor. This extension provides a satisfactory explanation for the position and intensity of the three observed magnetic excitations in CeCuAl 3, as well as their dependence on momentum transfer and temperature. On the basis of our analysis, we attribute the observed series of magnetic excitations to the existence of a vibron quasibound state.",

author = "Adroja, {D. T.} and {Del Moral}, A. and {De La Fuente}, C. and A. Fraile and Goremychkin, {E. A.} and Taylor, {J. W.} and Hillier, {A. D.} and F. Fernandez-Alonso",

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T1 - Vibron quasibound state in the noncentrosymmetric tetragonal heavy-fermion compound CeCuAl 3

AU - Adroja, D. T.

AU - Del Moral, A.

AU - De La Fuente, C.

AU - Fraile, A.

AU - Goremychkin, E. A.

AU - Taylor, J. W.

AU - Hillier, A. D.

AU - Fernandez-Alonso, F.

PY - 2012/5/23

Y1 - 2012/5/23

N2 - We have investigated the noncentrosymmetric tetragonal heavy-fermion antiferromagnetic compound CeCuAl 3 (T N=2.5K) using inelastic neutron scattering (INS). Our INS results unequivocally reveal the presence of three magnetic excitations centered at 1.3, 9.8, and 20.5 meV. These spectral features cannot be explained within the framework of crystal-electric-field models and recourse to Kramers' theorem for a 4f1 Ce3 + ion. To overcome these interpretational difficulties, we have generalized the vibron model of Thalmeier and Fulde for cubic CeAl 2 to tetragonal point-group symmetry with the theoretically calculated vibron form-factor. This extension provides a satisfactory explanation for the position and intensity of the three observed magnetic excitations in CeCuAl 3, as well as their dependence on momentum transfer and temperature. On the basis of our analysis, we attribute the observed series of magnetic excitations to the existence of a vibron quasibound state.

AB - We have investigated the noncentrosymmetric tetragonal heavy-fermion antiferromagnetic compound CeCuAl 3 (T N=2.5K) using inelastic neutron scattering (INS). Our INS results unequivocally reveal the presence of three magnetic excitations centered at 1.3, 9.8, and 20.5 meV. These spectral features cannot be explained within the framework of crystal-electric-field models and recourse to Kramers' theorem for a 4f1 Ce3 + ion. To overcome these interpretational difficulties, we have generalized the vibron model of Thalmeier and Fulde for cubic CeAl 2 to tetragonal point-group symmetry with the theoretically calculated vibron form-factor. This extension provides a satisfactory explanation for the position and intensity of the three observed magnetic excitations in CeCuAl 3, as well as their dependence on momentum transfer and temperature. On the basis of our analysis, we attribute the observed series of magnetic excitations to the existence of a vibron quasibound state.

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JO - Physical Review Letters

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Vibron quasibound state in the noncentrosymmetric tetragonal heavy-fermion compound CeCuAl ₃

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