Spin gap and antiferromagnetic correlations in the Kondo insulator CeNiSn

T. E. Mason; G. Aeppli; A. P. Ramirez; K. N. Clausen; C. Broholm; N. Sẗcheli; E. Bucher; T. T.M. Palstra

doi:10.1103/PhysRevLett.69.490

Spin gap and antiferromagnetic correlations in the Kondo insulator CeNiSn

T. E. Mason^*, G. Aeppli, A. P. Ramirez, K. N. Clausen, C. Broholm, N. Sẗcheli, E. Bucher, T. T.M. Palstra

^*Corresponding author for this work

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Abstract

Neutron scattering measurements show that the crossover (at T10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.

Original language	English
Pages (from-to)	490-493
Number of pages	4
Journal	Physical review letters
Volume	69
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.69.490
Publication status	Published - 1 Jan 1992
Externally published	Yes

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title = "Spin gap and antiferromagnetic correlations in the Kondo insulator CeNiSn",

abstract = "Neutron scattering measurements show that the crossover (at T10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.",

author = "Mason, {T. E.} and G. Aeppli and Ramirez, {A. P.} and Clausen, {K. N.} and C. Broholm and N. Sẗcheli and E. Bucher and Palstra, {T. T.M.}",

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AU - Aeppli, G.

AU - Ramirez, A. P.

AU - Clausen, K. N.

AU - Broholm, C.

AU - Sẗcheli, N.

AU - Bucher, E.

AU - Palstra, T. T.M.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - Neutron scattering measurements show that the crossover (at T10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.

AB - Neutron scattering measurements show that the crossover (at T10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.

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Spin gap and antiferromagnetic correlations in the Kondo insulator CeNiSn

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