N. E. Sluchanko, A. V. Bogach, V. V. Glushkov, S. V. Demishev, S. Yu. Gavrilkin, N. Yu. Shitsevalova, V. B. Filipov, S. Gabani, K. Flachbart, “Anomalies of the specific heat near the quantum critical point in Tm0.74Yb0.26B12”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2010, Volume 91, Issue 2,Pages 81

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Anomalies of the specific heat near the quantum critical point in Tm_0.74Yb_0.26B₁₂

N. E. Sluchanko^a, A. V. Bogach^a, V. V. Glushkov^ab, S. V. Demishev^ab, S. Yu. Gavrilkin^c, N. Yu. Shitsevalova^d, V. B. Filipov^d, S. Gabani^e, K. Flachbart^e

^a General Physics Institute named after A. M. Prokhorov, Russian Academy of Sciences
^b Moscow Institute of Physics and Technology
^c P. N. Lebedev Physical Institute, Russian Academy of Sciences
^d Frantsevich Institute of Materials Science Problems, National Academy of Sciences of Ukraine
^e Institute for Experimental Physics, Slovak Academy of Sciences, SK-04001, Košice, Slovakia

Abstract: The behavior of the specific heat near the quantum critical point x ~ 0.3 in the Tm_{1 − x}Yb_xB₁₂ system has been studied. Detailed measurements have been performed on high-quality single-crystalline Tm_0.74Yb_0.26B₁₂ samples within a wide temperature range of 1.9–300 K in a magnetic field up to 9 T. The temperature dependence of the magnetic contribution to the specific heat has a logarithmic divergence of the form C/T ~ lnT at T < 4 K, which can be attributed to the quantum critical behavior regime suppressed by the external magnetic field. The Schottky anomaly of the magnetic contribution to the specific heat in Tm_0.74Yb_0.26B₁₂ has been analyzed.

Received: 27.11.2009