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The thermal expansion of a diluted Ce system La 1- x Ce x Cu 6  for (0.6 ≤  x  ≤ 1) has been measured between 10 and 150 K to reveal the change from the coherent heavy Fermion state (0.9 ≤  x  ≤ 1) to the incoherent Kondo state (0 &lt; x ≤ 0.73). The large Ce concentration x dependence of the linear thermal expansion coefficient along b-axis  α b ( T ) suggests that the coupling between the 4 f 1  electron and the lattice strain is the largest along the b-axis in the three crystallographic axes. The maximum of the magnetic contribution to the volume thermal expansion coefficient  β m ( T ) at  T  = 50 K is retained in the  x  range of 0.6 ≤ x ≤ 1, suggesting the crystalline electric field (CEF) level for  x  = 1 doesn’t change by the substitution. Furthermore, the upturn in  β m ( T ) below 25 K, which should be a precursor of the maximum at  T  = 2.5 K reported for  x  = 1, is retained when we decrease  x  from 1 to 0.6. Because the ground state for  x  = 0.6 is the incoherent Kondo state, the robustness of the maximum at  T  = 50 K and upturn in the current  x  value implies that  β m ( T ) in 10 ≤  T ≤  150 K is attributed to the CEF and Kondo effects rather than the formation of the heavy Fermion state.

Thermal Expansion in a diluted Ce system La1–x Ce x Cu6

Thermal Expansion in a diluted Ce system La_1–xCe_xCu₆