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arXiv 1808.07583cond-mat.str-elcond-mat.mtrl-sci
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$Y_{2}Ir_{2}O_{7}$中未掺杂Weyl半金属电荷输运的证据

Evidence for Undoped Weyl Semimetal Charge Transport in $Y_{2}Ir_{2}O_{7}$

P. G. LaBarre, L. Dong, J. Trinh, T. Siegrist, A. P. Ramirez

摘要:

在单粒子模型中,预测了外尔费米子从随机库仑势散射的电阻率随温度的变化关系$ρ\space α\space T^{-4}$。在这里,我们表明,在封闭的环境中生长的多晶样品的$Y_{2}Ir_{2}O_{7}$,$ρ= ρ_{0} T^{-4}$超过四个数量级的$ρ$。虽然测量的前因子$ρ_{0}$是使用合理的材料参数从模型中获得的,但$T^{-4}$行为远远超出了模型的适用范围。特别地,该行为延伸到低温、高电阻率区域,其中Ioffe-Regel参数$k_{T} \ell \ll 2π$。强烈的现场库仑相关,预测外尔半金属态$Y_{2}Ir_{2}O_{7}$,是这种“坏”外尔半金属行为的可能来源。

英文摘要:

Weyl fermions scattering from a random Coulomb potential are predicted to exhibit resistivity versus temperature $ρ\space α\space T^{-4}$ in a single particle model. Here we show that, in closed environment-grown polycrystalline samples of $Y_{2}Ir_{2}O_{7}$, $ρ= ρ_{0} T^{-4}$ over four orders of magnitude in $ρ$. While the measured prefactor, $ρ_{0}$, is obtained from the model using reasonable materials parameters, the $T^{-4}$ behavior extends far beyond the model's range of applicability. In particular, the behavior extends into the low-temperature, high-resistivity region where the Ioffe-Regel parameter, $k_{T} \ell \ll 2π$. Strong on-site Coulomb correlations, instrumental for predicting a Weyl semimetal state in $Y_{2}Ir_{2}O_{7}$, are the possible origin of such "bad" Weyl semimetal behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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