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

Published

September 25, 2014

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 E_c = 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

Pub Type

Journals

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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 CeCu₄Ga, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916224 (Accessed October 9, 2024)