The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics

Details The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics

2004-05-06

arxiv.org/abs/cond-mat/0405118v1

J. Phys.: Condens. Matter V.16, 3433-3443 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 7 figs

Scientific paper

10.1088/0953-8984/16/20/014

We have investigated metallic break junctions of the heavy-fermion compound UPd2Al3 at low temperatures between 0.1K and 9K and in magnetic fields up to 8T. Both the current-voltage I(V) characteristics and the dV/dI (V) spectra clearly showed the superconducting ($T_{\rm c}\simeq$ 1.8K) as well as the antiferromagnetic ($T_{\rm N}\simeq$14K) transition at low temperatures when the bias voltage is raised. The junctions with lateral size of order 200nm had huge critical current densities around $5\times 10^{10} A/m^2 at the antiferromagnetic transition and hysteretic I(V) characteristics. Degrading the quality of the contacts by in situ increasing the local residual resistivity reduced the hysteresis. We show that those hysteretic I(V) curves can be reproduced theoretically by assuming the constriction to be in the thermal regime. It turns out that these point contacts represent non-linear devices with N-shaped I(V) characteristics that have a negative differential resistance like an Esaki tunnel diode.

Affiliated with

Also associated with

No associations

Rating

The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The antiferromagnetic transition of UPd2Al3 break-junctions: A new realization of N-shaped current-voltage characteristics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-711856