Scaling behavior of the thermopower of the archetypical heavy-fermion metal $\rm{YbRh_2Si_2}$
| Autor: | Shaginyan, V. R., Msezane, A. Z., Japaridze, G. S., Popov, K. G., Clark, J. W., Khodel, V. A. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Frontiers of Physics 11, 117102 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s11467-015-0536-3 |
| Popis: | We reveal and explain a scaling behavior of the thermopower $S/T$ exhibiting by the archetypical heavy-fermion (HF) metal $\rm{YbRh_2Si_2}$ under the application of magnetic field $B$ at temperatures $T$. We show that the same scaling is demonstrated by such different HF compounds as $\beta$-${\rm YbAlB_4}$ and the strongly correlated layered cobalt oxide $\rm [BiBa_{0.66}K_{0.36}O_{2}]CoO_{2}$. Using $\rm{YbRh_2Si_2}$ as an example, we demonstrate that the scaling behavior of $S/T$ is violated at the antiferromagnetic phase transition, while both the residual resistivity $\rho_0$ and the density of states $N$ experience jumps at the phase transition, making the thermopower experience two jumps and change its sign. Our elucidation is based on flattening of the single-particle spectrum that profoundly affects $\rho_0$ and $N$. To depict the main features of the $S/T$ behavior, we construct the $T-B$ schematic phase diagram of $\rm{YbRh_2Si_2}$. Our calculated $S/T$ for the HF compounds are in good agreement with experimental facts and support our observations. Comment: 7 pages, 6 figures, version 4 contains minor corrections |
| Databáze: | arXiv |
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