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Short-Range Magnetic Correlations in the Highly-Correlated Electron Compound CeCu4Ga

Published

Author(s)

B. G. Ueland, C. F. Miclea, K. Gofryk, Yiming Qiu, F. Ronning, R. Movshovich, E. D. Bauer, J. S. Gardner, J. D. Thompson

Abstract

We report results from experiments on the heavy-electron compound CeCu4Ga which show that it possesses short-range magnetic correlations down to a temperature of T = 0.1 K. A peak occurs in the specific heat at T* = 1.2 K, but the specific heat remains large as T 0 K resulting in a large Sommerfeld coefficient of γ0 = 1.44(2) J/mol-K2. Below T*, the resistivity apparently follows T2 behavior and the ac magnetic susceptibility becomes temperature independent. T* shifts to higher temperatures upon application of a magnetic field, and inelastic neutron scattering data show a quasielastic magnetic peak centered at a neutron energy transfer of Ec = 0.24(1) meV, which shifts to higher energies and broadens under a magnetic field. Elastic neutron scattering data find no evidence for long-range magnetic order down to T = 0.1 K, however, magnetic diffuse scattering is observed which corresponds to short-range magnetic correlations occurring across two unit cells. We discuss the coexistence of large specific heat, magnetic fluctuations, and short-range magnetic correlations at low temperatures and compare our results to those for materials possessing spin-liquid behavior.
Citation
Physical Review B
Volume
90
Issue
12

Keywords

short range magnetic correlations, CeCu4Ga

Citation

Ueland, B. , Miclea, C. , Gofryk, K. , Qiu, Y. , Ronning, F. , Movshovich, R. , Bauer, E. , Gardner, J. and Thompson, J. (2014), Short-Range Magnetic Correlations in the Highly-Correlated Electron Compound CeCu<sub>4</sub>Ga, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916224 (Accessed June 17, 2024)

Issues

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Created September 24, 2014, Updated October 12, 2021