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Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Heavy Fermions

TT 17.6: Talk

Wednesday, March 28, 2007, 15:15–15:30, H18

Pressure-temperature phase diagram of URu2Si2 by resistivity measurements — •Elena Hassinger1,2, Georg Knebel2, Bernard Salce2, Jacques Flouquet2, and Pascal Lejay31KIP, Universität Heidelberg, Germany — 2DRFMC, SPSMS, CEA Grenoble, France — 3CRTBT, CNRS Grenoble, France

At ambient pressure URu2Si2 undergoes a transition at T0=17.5 K to so called hidden order phase and a second transition to superconducting ground state at TSC=1.5 K. We measured the resistivity of a small single crystal in highly hydrostatic pressure up to 2.5 GPa in a diamond anvil pressure cell with Argon as pressure transmitting medium. At the critical pressure pc=0.5 GPa a large moment antiferromagnetic phase develops and can be seen as a small anomaly in the resistivity curves ρ(T) at constant pressure. In these measurements the superconducting transition can be seen up to 1.3 GPa. In the vicinity of pc the resistivity curves in the normal state at low temperature follow a power law with an exponent smaller than 2 indicating non Fermi liquid behavior.

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