arXiv subjects

A. Fernandez-Pañella

Publications and source records attributed to A. Fernandez-Pañella.

2 recordsLinked to original sources

arXiv2012

(p,T,H) phase diagram of Heavy Fermion systems : Some systematics and some surprises from ytterbium

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.

cond-mat.str-el↗

arXiv2011

Ferromagnetism in YbCu2Si2 at high pressure

We demonstrate from detailed ac-susceptibility and calorimetry studies under hydrostatic pressure that YbCu2Si2 probably orders ferromagnetically at high pressure. The (p,H,T) phase diagram, shows that the transition temperature increases with pressure, but also with an applied magnetic field. We suggest that many ytterbium systems may show a trend towards ferromagnetism and we discuss the possible reasons for this. We also examine the implications, including the potential of YbCu2Si2 and other Yb compounds for further studies of the rich physical properties that may occur near a ferromagnetic critical point.

cond-mat.str-el↗