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Short-range magnetic correlations in the highly correlated electron compound CeCu4Ga

TitleShort-range magnetic correlations in the highly correlated electron compound CeCu4Ga
Publication TypeJournal Article
Year of Publication2014
AuthorsUeland, BG, Miclea, CF, Gofryk, K, Qiu, Y, Ronning, F, Movshovich, R, Bauer, ED, Gardner, JS, Thompson, JD
JournalPhysical Review B
Date Published09
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000342497700002
Keywordscerium, diffraction, fermion compound, field, kondo-lattice, liv2o4, neutron-scattering, order

We present experimental results for the heavy-electron compound CeCu4Ga which show that it possesses short-range magnetic correlations down to a temperature of T = 0.1 K. Our neutron scattering data show no evidence of long-range magnetic order occurring despite a peak in the specific heat at T* = 1.2 K. Rather, magnetic diffuse scattering occurs which corresponds to short-range magnetic correlations occurring across two unit cells. The specific heat remains large as T similar to 0 K, resulting in a Sommerfeld coefficient of gamma(0) = 1.44(2) J/mol K-2, and, below T*, the resistivity follows T-2 behavior and the ac magnetic susceptibility becomes temperature independent. A magnetic peak centered at an energy transfer of E-c = 0.24(1) meV is seen in inelastic neutron scattering data which shifts to higher energies and broadens under a magnetic field. 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.

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