Mb. Maple et al., SINGLE-ION SCALING OF THE LOW-TEMPERATURE PROPERTIES OF F-ELECTRON MATERIALS WITH NON-FERMI-LIQUID GROUNDSTATES, Journal of physics. Condensed matter, 8(48), 1996, pp. 9773-9791
Certain chemically substituted Ce and U compounds have low-temperature
physical properties that exhibit non-Fermi-liquid (NFL) characteristi
cs and apparently constitute a new class of strongly correlated f-elec
tron materials. The NFL behaviour takes the form of weak power law or
logarithmic divergences in the temperature dependence of the physical
properties that scale with a characteristic temperature T-0, which, in
some systems, can be identified with the Kondo temperature T-K. These
systems have complex temperature T-chemical substituent composition x
phase diagrams, which contain regions displaying the Kondo effect, NF
L behaviour, spin glass freezing, magnetic order, quadrupolar order, a
nd, sometimes, even superconductivity. Possible origins of the NFL beh
aviour include a multichannel Kondo effect and fluctuations of an orde
r parameter in the vicinity of a second-order phase transition at T =
0 K. Recent experiments on the systems Y1-xUxPd3 and U(1-x)M(x)Pd(2)Al
(3) (M = Th, Y) are reviewed. In the Y1-xUxPd3 and U1-xThxPd2Al3 syste
ms, the low-temperature physical properties in the NFL regime scale wi
th the U concentration and T-K, suggesting that single-ion effects are
responsible for the NFL behaviour.