Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 17: Heavy Fermions

TT 17.6: Vortrag

Mittwoch, 28. März 2007, 15:15–15:30, H18

Pressure-temperature phase diagram of URu₂Si₂ by resistivity measurements — •Elena Hassinger^1,2, Georg Knebel², Bernard Salce², Jacques Flouquet², and Pascal Lejay³ — ¹KIP, 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 T_SC=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 p_c=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 p_c 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.