Abstract
We reported the growth of Fe2As single crystals and the study of its physical properties via comprehensive measurements, such as transport properties under pressure and high-pressure synchrotron radiation X-ray diffraction. Fe2As is an antiferromagnetic metal with TN ~ 355 K. Within the pressure range of 100 GPa, no superconductivity was observed above 2 K. The abrupt drop in resistance from 21 to 31.7 GPa suggests a high-pressure phase transition happens. The high-pressure X-ray experiments indicate a new high-pressure phase appears, starting from 27.13 GPa. After the refinement of the high-pressure X-ray data, the pressure dependence of lattice constants of Fe2As (P4/nmm phase) was plotted and the bulk modulus B0 was obtained to be 168.6 GPa.
Highlights
The discovery of the superconducting LaO1−x Fx FeAs [1] with Tc = 26 K has attracted great interest to search for new iron-based superconductors
The superconducting transition temperature was quickly enhanced to a maximum of 55 K in SmO1−x Fx FeAs [4]
The mechanism of superconductivity in iron-based compounds is considered to be highly related with the antiferromagnetic spin fluctuation
Summary
The discovery of the superconducting LaO1−x Fx FeAs [1] with Tc = 26 K has attracted great interest to search for new iron-based superconductors. Soon after this discovery, a series of iron-based layered oxypnictides RFeAs(O1−x Fx ) were found by replacing La atoms with other rare-earth elements R (R = Ce, Pr, Nd, Sm, ...) [2,3,4,5]. Iron-based superconductors contain the common Fe2×2 (X = As and Se) unit, which is believed to be crucial to support superconductivity in the iron-based materials. The mechanism of superconductivity in iron-based compounds is considered to be highly related with the antiferromagnetic spin fluctuation
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