Thermal expansion at the metamagnetic transition in single-crystalline heavy-fermion (Ce,La)Ru2Si2

Abstract
We present measurements of the volume expansion (αv) in magnetic fields up to 8.5 T and in the temperature range 1.3 K<T1−xLaxRu2Si2 (x=0 and 0.05). In reduced scales the two compounds present the same low temperature Grüneisen coefficients. Emphasis is given on the strong field dependence of the low temperature extremum of αv. The validity of scaling law with pressure is verified. The interest to use a magnetic field to approach a magnetic instability is strongly underlined.

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