We explore field and temperature scaling of magnetoresistance in underdoped ($x=0$, $x=0.19$) and optimally doped ($x=0.31$) samples of the high-temperature superconductor ${\mathrm{BaFe}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$. In all cases, the magnetoresistance is $H$ linear at high fields. We demonstrate that the data can be explained by an orbital model in the presence of strongly anisotropic quasiparticle spectra and scattering time due to antiferromagnetism. In optimally doped samples, the magnetoresistance is controlled by the properties of small regions of the Fermi surface called “hot spots,” where antiferromagnetic excitations induce a large quasiparticle scattering rate. The anisotropic scattering rate results in hyperbolic $H/T$ magnetoresistance scaling, which competes with the more conventional Kohler scaling. We argue that these results constitute a coherent picture of magnetotransport in ${\mathrm{BaFe}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$, which links the origin of $H$-linear resistivity to antiferromagnetic hot spots. Implications for the $T$-linear resistivity at zero field are discussed.

中文翻译：

---

BaFe2（As1-xPx）2中的磁阻定标和H线性电阻率的由来

我们探索了掺杂不足的磁阻的场和温度标度$X=0$， $X=0.19$）和最佳掺杂（$X=0.31$）高温超导体样品 ${\mathrm{钡铁}}_2（{如}_{\mathrm{1个}-X}{\mathrm{P}}_X{）}_2$。在所有情况下，磁阻为$H$高场线性。我们证明了在存在强烈各向异性的准粒子光谱和由于反铁磁性引起的散射时间的情况下，可以通过轨道模型来解释数据。在最佳掺杂的样品中，磁阻由费米表面称为“热点”的小区域的特性控制，在该区域中，反铁磁激发会引起较大的准粒子散射速率。各向异性散射率导致双曲$H/Ť$磁阻定标，可与更传统的科勒定标竞争。我们认为，这些结果构成了磁传输中相干的图景。${\mathrm{钡铁}}_2（{如}_{\mathrm{1个}-X}{\mathrm{P}}_X{）}_2$，它链接了 $H$-对反铁磁热点的线性电阻率。对的影响$Ť$讨论了零磁场下的线性电阻率。