The extremely large magnetoresistance (XMR) effect in nonmagnetic semimetals have attracted intensive attention recently. Here we propose an XMR candidate material SrPd based on first-principles electronic structure calculations in combination with a semi-classical model. The calculated carrier densities in SrPd indicate that there is a good electron-hole compensation, while the calculated intrinsic carrier mobilities are as high as 10${}^5$ cm${}^2$V${}^{-1}$s${}^{-1}$. There are only two doubly degenerate bands crossing the Fermi level for SrPd, thus a semi-classical two-band model is available for describing its transport properties. Accordingly, the magnetoresistance of SrPd under a magnetic field of $4$ Tesla is predicted to reach ${10}^5\%$ at low temperature. Furthermore, the calculated topological invariant indicates that SrPd is topologically trivial. Our theoretical studies suggest that SrPd can serve as an ideal platform to examine the charge compensation mechanism of the XMR effect.

中文翻译：

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SrPd，具有极大磁阻的候选材料

非磁性半金属中极大的磁阻（XMR）效应最近引起了广泛的关注。在这里，我们结合第一手电子原理和半经典模型，提出了一种XMR候选材料SrPd。计算得出的SrPd中的载流子密度表明有良好的电子空穴补偿，而计算出的固有载流子迁移率高达10${}^5$ 厘米${}^2$V${}^{-\mathrm{1个}}$s${}^{-\mathrm{1个}}$。SrPd的费米能级只有两个双简并带，因此可以使用半经典的两带模型来描述其传输特性。因此，SrPd的磁场强度为$4$ 特斯拉有望达到 ${10}^5％$在低温下。此外，计算出的拓扑不变性表明SrPd在拓扑上是微不足道的。我们的理论研究表明，SrPd可以用作检查XMR效应的电荷补偿机制的理想平台。