Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations

Details Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations

2008-02-13

arxiv.org/abs/0802.1827v1

Phys. Rev. B 77, 104412 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 4 figures, accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.104412

We present the thermopower S(T) and the resistivity rho(T) of Lu(1-x)Yb(x)Rh2Si2 in the temperature range 3 K < T < 300 K. S(T) is found to change from two minima for dilute systems (x < 0.5) to a single large minimum in pure YbRh2Si2. A similar behavior has also been found for the magnetic contribution to the resistivity rho_mag(T). The appearance of the low-T extrema in S(T) and rho_mag(T) is attributed to the lowering of the Kondo scale with decreasing x. The evolution of the characteristic energy scales for both the Kondo effect and the crystal electric field splitting are deduced. An extrapolation allows to estimate the Kondo temperature of YbRh2Si2 to 29 K.

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