Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2

Details Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2 Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2

2009-04-20

arxiv.org/abs/0904.2969v1

Phys. Rev. Lett. 102, 196402 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for PRL

Scientific paper

10.1103/PhysRevLett.102.196402

We report on precise low-temperature specific-heat measurements, C(T), of YbRh2Si2 in the vicinity of the antiferromagnetic phase transition on a single crystal of superior quality (RRR 150). We observe a very sharp peak at T_N=72mK with absolute values as high as C/T=8J/molK^2. A detailed analysis of the critical exponent \alpha around T_N reveals \alpha=0.38 which differs significantly from those of the conventional universality classes in the Ginzburg-Landau theory, where \alpha<0.11. Thermal-expansion measurements corroborate this large positive critical exponent. These results provide insight into the nature of the critical magnetic fluctuations at a temperature-driven phase transition close to a quantum critical point.

Affiliated with

Also associated with

No associations

Rating

Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2 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 Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Violation of critical universality at the antiferromagnetic phase transition of YbRh2Si2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-173811