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arXiv 1302.1806cond-mat.str-el
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准晶和重费米子金属中的共量子相变

Common quantum phase transition in quasicrystals and heavy-fermion metals

V. R. Shaginyan, A. Z. Msezane, K. G. Popov, G. S. Japaridze, V. A. Khodel

摘要:

非晶体学旋转对称性和准周期性平移性质的准晶体新材料引起了人们的关注。对准晶的研究可能会揭示与重费米子金属中观察到的量子临界态相关的最基本概念。我们证明了某些准晶的电子系统在没有调谐的情况下位于费米子凝聚量子相变。在这种情况下,准晶具有非费米液体行为的量子临界态,在磁场中转变为朗道费米液体行为。值得注意的是,尽管电子经历了强烈的无序,但量子临界态是稳健的。我们还首次证明了准晶的磁化率等热力学性质具有典型的标度行为,属于著名的重费米子金属家族。我们计算的热力学性质与最近的实验观测结果吻合得很好。

英文摘要:

Extraordinary new materials named quasicrystals and characterized by noncrystallographic rotational symmetry and quasiperiodic translational properties have attracted scrutiny. Study of quasicrystals may shed light on the most basic notions related to the quantum critical state observed in heavy-fermion metals. We show that the electronic system of some quasicrystals is located at the fermion condensation quantum phase transition without tuning. In that case the quasicrystals possess the quantum critical state with the non-Fermi liquid behavior which in magnetic fields transforms into the Landau Fermi-liquid one. Remarkably, the quantum critical state is robust despite the strong disorder experienced by the electrons. We also demonstrate for the first time that quasicrystals exhibit the typical scaling behavior of their thermodynamic properties such as the magnetic susceptibility, and belong to the famous family of heavy-fermion metals. Our calculated thermodynamic properties are in good agreement with recent experimental observations.

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