压力下二元FeAs的磁性、结构和强电子-声子耦合之间的相互作用
The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure
摘要：
与铁磷属元素化物超导体不同，其结晶为四方晶系晶体结构，二元FeAs形成正交晶系晶体结构，其中局部原子环境类似于铁磷属元素化物超导体的FeAs 4四方晶系构建块的高度扭曲变体。然而，像铁磷族化合物超导体的母体化合物一样，FeAs在低温下经历磁有序，没有证据表明在环境压力下有利于超导基态。我们采用压力相关的电输运和X射线衍射测量，使用金刚石对顶砧单元来表征磁状态和结构作为压力的函数。虽然FeAs的MnP型结构持续到25 GPa，在压力下连续压缩没有结构转变的证据，但在超过11 GPa的压力下没有观察到与磁性相关的磁输运测量特征。在可观察到的，与磁秩序在环境压力下的功能显示出显着的压力依赖性很小，和运输测量表明，耦合到费米表面通过一个强大的电子-声子相互作用的动态结构不稳定性可能发挥重要作用，使磁性的FeAs。
英文摘要：
Unlike the ferropnictide superconductors, which crystallize in a tetragonal crystal structure, binary FeAs forms in an orthorhombic crystal structure, where the local atomic environment resembles a highly distorted variant of the FeAs4 tetrahdedral building block of the ferropnictide superconductors. However, like the parent compounds of the ferropnictide superconductors, FeAs undergoes magnetic ordering at low temperatures, with no evidence favoring a superconducting ground state at ambient pressure. We employ pressure-dependent electrical transport and x-ray diffraction measurements using diamond anvil cells to characterize the magnetic state and the structure as a function of pressure. While the MnP-type structure of FeAs persists up to 25 GPa, compressing continuously with no evidence of structural transformations under pressure, features in the magnetotransport measurements associated with magnetism are not observed for pressures in excess of 11 GPa. Where observable, the features associated with magnetic order at ambient pressure show remarkably little pressure dependence, and transport measurements suggest that a dynamical structural instability coupled to the Fermi surface via a strong electron-phonon interaction may play an important role in enabling magnetism in FeAs.
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