论文标题
在强耦合超导体中具有通用能量表的线性磁化力
Linear magnetoresistance with a universal energy scale in a strong-coupling superconductor
论文作者
论文摘要
最近在量子临界点附近的几个相关电子系统中发现了非饱和线性磁磁性的发现，这表明线性磁磁性与零视场在温度的电阻率之间存在有趣的相互作用。这些研究表明，量子关键性可能在观察到的线性磁磁性上起可能作用。在这里，我们报告了我们发现的不饱和，线性的磁磁性，$ $ _8 $ _8 $ ga $ _ {41} $，几乎是各向同性强的电子偶联超导体，具有线性的电阻率，从过渡温度到$ \ sim $ \ sim $ \ sim $ 55 k的量子的量为55 k。我们的数据集与最佳掺杂的LA $ _ {2-x} $ sr $ _x $ _x $ cuo $ _4 $的磁磁性数据非常相似，尽管晶体和电子结构明显不同，并且显然没有Mo $ $ $ $ _8 $ GA $ _ $ _ $ _ {41} $的量子关键物理学。开发了一种新的经验缩放公式，能够捕获Mo $ $ $ $ _8 $ ga $ _ $ _ {41} $的低温磁场数据的关键特征，以及LA $ _ {2-x} $ sr $ _x $ _x $ _x $ cuo $ _4 $ _4 $ _4 $ _4 $的数据。
The recent discovery of a nonsaturating linear magnetoresistance in several correlated electron systems near a quantum critical point has revealed an interesting interplay between the linear magnetoresistance and the zero-field linear-in-temperature resistivity. These studies suggest a possible role of quantum criticality on the observed linear magnetoresistance. Here, we report our discovery of a nonsaturating, linear magnetoresistance in Mo$_8$Ga$_{41}$, a nearly isotropic strong electron-phonon coupling superconductor with a linear-in-temperature resistivity from the transition temperature to $\sim$55 K. The growth of the resistivity in field is comparable to that in temperature, provided that both quantities are measured in the energy unit. Our datasets are remarkably similar to magnetoresistance data of the optimally doped La$_{2-x}$Sr$_x$CuO$_4$, despite the clearly different crystal and electronic structures, and the apparent absence of quantum critical physics in Mo$_8$Ga$_{41}$. A new empirical scaling formula is developed, which is able to capture the key features of the low-temperature magnetoresistance data of Mo$_8$Ga$_{41}$, as well as the data of La$_{2-x}$Sr$_x$CuO$_4$.
