D. Braithwaite, A. Fernandez-Pañella, E. Colombier, B. Salce, G. Knebel, G. Lapertot, V. Balédent, J. -P. Rueff, L. Paolasini, R. Verbeni, J. Flouquet
Pressure is the cleanest way to tune heavy fermion systems to a quantum phase transition in order to study the rich physics and competing phases, and the comparison between ytterbium and cerium systems is particularly fruitful. We briefly review the mechanisms in play and show some examples of expected and unexpected behaviour. We emphasize the importance of the valence changes under pressure and show how modern synchrotron techniques can accurately determine this, including at low temperature.
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http://arxiv.org/abs/1206.4861
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