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Formation of a heavy fermion phase in UCu4+xAl8−x by variation of stoichiometry

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Citation

Geibel, C., Aahlheim, U., Giorgi, A. L., Sparn, G., Spille, H., Steglich, F., et al. (1990). Formation of a heavy fermion phase in UCu4+xAl8−x by variation of stoichiometry. Physica B-Condensed Matter, 163(1-3), 194-196. doi:10.1016/0921-4526(90)90166-R.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D529-3
Abstract
Progressive substitution of Cu for Al in UCu4+xAl8−x yields as increasing compression of the unit cell. This results in a reduction of the Néel temperature from ifTN = 42 K for x = 0 to ifTN = 15 K for x = 1.0. No magnetic ordering is found for x ⩾ 1.5. Rather the T-dependence of the resistivity shows a maximum in the range 6 to 15 K and indicates the formation of a Kondo-lattice state. The latter is characterized by heavy fermions (γ(Tå0)≅0.8 J/K2 mol for x = 1.75).