论文标题
电阻率最小的金属磁铁中的电阻率
Resistivity minimum in diluted metallic magnets
论文作者
论文摘要
电阻率最小值通常在迭代磁铁中看到，并且通常归因于近藤效应。然而，最近的实验表明，在没有伴有伴亲旋形成的指示的情况下，显示了越来越多的材料。在先前的工作中[Z. Wang，K。Barros，G.-W。 Chern，D。L. Maslov和C. D. Batista，物理。莱特牧师。 117，206601（2016）]，我们证明了Ruderman-Kittel-Kasuya-Yosida（Rkky）相互作用可以在有限温度下产生经典的自旋液态，其电阻率随温度降低而增加。由于2D电子气体产生的rkky相互作用的沮丧性质，经典的自旋液体存在于相对较大的温度窗口上。在这项工作中，我们研究了rkky诱导的电阻率上升对位点稀释的鲁棒性，这为将经典的自旋液态稳定至t = 0提供了一种替代性，更健壮的方式。通过使用串联膨胀和随机Landau-Lifshitz动力学模拟，我们表明位点稀释与热波动竞争并进一步稳定电阻率上流，由于电子旋转散射的抑制，这伴随着负磁倍率。
Resistivity minima are commonly seen in itinerant magnets and they are often attributed to the Kondo effect. However, recent experiments are revealing an increasing number of materials showing resistivity minima in the absence of indications of Kondo singlet formation. In a previous work [Z. Wang, K. Barros, G.-W. Chern, D. L. Maslov, and C. D. Batista, Phys. Rev. Lett. 117, 206601 (2016)], we demonstrated that the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction can produce a classical spin liquid state at finite temperature, whose resistivity increases with decreasing temperature. The classical spin liquid exists over a relatively large temperature window because of the frustrated nature of the RKKY interaction produced by a 2D electron gas. In this work, we investigate the robustness of the RKKY-induced resistivity upturn against site dilution, which provides an alternative, and more robust, way of stabilizing the classical spin liquid state down to T=0. By using series expansions and stochastic Landau-Lifshitz dynamics simulation, we show that site dilution competes with thermal fluctuations and further stabilizes the resistivity upturn, which is accompanied by a negative magnetoresistivity due to suppression of the electron-spin scattering.
