Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points

Details Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points

2005-06-15

arxiv.org/abs/cond-mat/0506336v2

Phys. Rev. B 72, 205129 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 7 figures; final version, only minor changes

Scientific paper

10.1103/PhysRevB.72.205129

We consider the Grueneisen parameter and the magnetocaloric effect near a pressure and magnetic field controlled quantum critical point, respectively. Generically, the Grueneisen parameter (and the thermal expansion) displays a characteristic sign change close to the quantum-critical point signaling an accumulation of entropy. If the quantum critical point is the endpoint of a line of finite temperature phase transitions, T_c \propto (p_c-p)^Psi, then we obtain for pT_c, (2) a sign change in the Ginzburg regime of the classical transition, (3) possibly a peak at T_c, (4) a second increase Gamma \sim -T^{-1/(nu z)} below T_c for systems above the upper critical dimension and (5) a saturation of Gamma \propto 1/(p_c-p). We argue that due to the characteristic divergencies and sign changes the thermal expansion, the Grueneisen parameter and magnetocaloric effect are excellent tools to detect and identify putative quantum critical points.

Affiliated with

Also associated with

No associations

Rating

Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points 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 Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sign change of the Grueneisen parameter and magnetocaloric effect near quantum critical points will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-288442