### Session R1: Poster Session III

1:00 PM–1:00 PM, Wednesday, March 7, 2007
Colorado Convention Center Room: Exhibit Hall F, 1:00pm - 4:00pm

Abstract ID: BAPS.2007.MAR.R1.182

### Abstract: R1.00182 : Hydrostatic pressure effects on {\it{T$_N$}} for single-crystal U(Pt$_{0.98}$Pd$_{0.02}$)$_3$

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#### Authors:

Diana Cuff
(Boston College)

Michael Graf
(Boston College)

Substitution of Pd for Pt in the heavy-fermion superconductor UPt$_3$ is known to suppress superconductivity and induce conventional antiferromagnetic order for x $\ge$ 0.006. It has been postulated that the primary effect of Pd is to exert a negative pressure, and that there is an antiferromagnetic quantum critical point (QCP) at x = 0.006. We are testing this through application of hydrostatic pressure on a single crystal sample of U(Pt$_{0.98}$Pd$_{0.02}$)$_3$ with ordering temperature {\it{T$_N$}} = 3.30 K by crossing the QCP from the ordered state. Our first measurements for temperatures above 2 K indicate that the pressure required to suppress the {\it{T$_N$}} to 0 K is approximately 6 +/- 1 kbar. We are now extending our measurements to lower temperatures (a) to refine this estimate, and (b) to look for signatures of quantum critical behavior in the low-temperature transport when {\it{T$_N$}} = 0 K.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.R1.182