Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-11-17
Phys. Lett. A 374 (2010) 659
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 6 figures. to be published in Phys. Letters A
Scientific paper
10.1016/j.physleta.2009.11.057
Low-temperature specific-heat measurements on YbRh2Si2 at the second order antiferromagnetic (AF) phase transition reveal a sharp peak at T_N=72 mK. The corresponding critical exponent alpha turns out to be alpha=0.38, which differs significantly from that obtained within the framework of the fluctuation theory of second order phase transitions based on the scale invariance, where alpha=0.1. We show that under the application of magnetic field the curve of the second order AF phase transitions passes into a curve of the first order ones at the tricritical point leading to a violation of the critical universality of the fluctuation theory. This change of the phase transition is generated by the fermion condensation quantum phase transition. Near the tricritical point the Landau theory of second order phase transitions is applicable and gives alpha=1/2. We demonstrate that this value of alpha is in good agreement with the specific-heat measurements.
Amusia Ya. M.
Popov K. G.
Shaginyan Vasily R.
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