欠掺杂BaFe$_2$(As$_{1-x}$P$_x$)$_2$中的奇异金属霍尔效应
Strange Metal Hall Effect in Underdoped BaFe$_2$(As$_{1-x}$P$_x$)$_2$
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中文总结 AI 辅助
本文研究欠掺杂BaFe$_2$(As$_{1-x}$P$_x$)$_2$的霍尔效应，发现其奇异金属霍尔贡献具有普适性，与临界涨落相关，关联T线性电阻率和非常规超导现象。
中文摘要 AI 辅助
奇异金属的异常输运性质指向准粒子图像的失效，对其的理解仍是物理学中最棘手的问题之一。本文报道对奇异金属超导体BaFe$_2$(As$_{1-x}$P$_x$)$_2$的电霍尔效应的研究，发现在假定的量子临界点上方的扇形区域内，霍尔效应存在与掺杂无关的贡献。该“奇异金属霍尔”贡献与反铁磁霍尔响应的诸多性质相似，但具有区分于费米面重构效应的普适性质，这与临界涨落的潜在起源一致，将其与T线性电阻率的观测及非常规超导电性的出现关联起来。
英文摘要
The unusual transport properties of strange metals point to the breakdown of the quasiparticle picture, the understanding of which remains one of the most vexing problems in physics. Here, we report investigations of the electrical Hall effect of the strange metal superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$. We show that a doping-independent contribution to the Hall effect exists within a fan shaped region above a putative quantum critical point. This `strange metal Hall' contribution echoes many of the properties of the antiferromangetic Hall response, but attains universal properties that distinguish it from the effects of Fermi surface reconstruction. This is consistent with an underlying origin connected to the presence of critical fluctuations, tying it to observations of $T$-linear resistivity and the appearance of unconventional superconductivity.
