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Unlike the ferropnictide superconductors, which crystallize in a tetragonalcrystal structure, binary FeAs forms in an orthorhombic crystal structure,where the local atomic environment resembles a highly distorted variant of theFeAs4 tetrahdedral building block of the ferropnictide superconductors.However, like the parent compounds of the ferropnictide superconductors, FeAsundergoes magnetic ordering at low temperatures, with no evidence favoring asuperconducting ground state at ambient pressure. We employ pressure-dependentelectrical transport and x-ray diffraction measurements using diamond anvilcells to characterize the magnetic state and the structure as a function ofpressure. While the MnP-type structure of FeAs persists up to 25 GPa,compressing continuously with no evidence of structural transformations underpressure, features in the magnetotransport measurements associated withmagnetism are not observed for pressures in excess of 11 GPa. Where observable,the features associated with magnetic order at ambient pressure show remarkablylittle pressure dependence, and transport measurements suggest that a dynamicalstructural instability coupled to the Fermi surface via a strongelectron-phonon interaction may play an important role in enabling magnetism inFeAs.

The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure