Pressure-Induced Isostructural Phase Transition and Correlation of FeAs Coordination with the Superconducting Properties of 111-Type Na1-xFeAs
The effect of pressure on the crystalline structure and superconducting transition temperature (T{sub c}) of the 111-type Na{sub 1-x}FeAs system using in situ high-pressure synchrotron X-ray powder diffraction and diamond anvil cell techniques is studied. A pressure-induced tetragonal to tetragonal isostructural phase transition was found. The systematic evolution of the FeAs{sub 4} tetrahedron as a function of pressure based on Rietveld refinements on the powder X-ray diffraction patterns was obtained. The nonmonotonic T{sub c}(P) behavior of Na{sub 1-x}FeAs is found to correlate with the anomalies of the distance between the anion (As) and the iron layer as well as the bond angle of As-Fe-As for the two tetragonal phases. This behavior provides the key structural information in understanding the origin of the pressure dependence of T{sub c} for 111-type iron pnictide superconductors. A pressure-induced structural phase transition is also observed at 20 GPa.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1041902
- Report Number(s):
- BNL-97580-2012-JA; JACSAT; TRN: US201212%%313
- Journal Information:
- Journal of the American Chemical Society, Vol. 133, Issue 20; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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