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Title: Structural properties of BaFe[subscript 1.8]Ni[subscript 0.2]As[subscript 2] under pressure

The structural properties of electron-doped compound BaFe1.8Ni0.2As2 are investigated by the synchrotron X-ray powder diffraction at high pressures ranged from 1 bar to 24.0 GPa at room temperature. The compound BaFe1.8Ni0.2As2 holds a tetragonal structure (space group I4/mmm) at ambient condition. Upon compression, the lattice parameter a first monotonically decreases from ambient pressure to 7.0 GPa, then increases till reaching a maximum at 17.8 GPa and again further decreases to the maximum pressure in this investigation. The other lattice parameter c exhibits a slow decrease with increasing pressure before 7.0 GPa and a rapid reduction after that. This anomalous lattice compression results in a lattice collapse at around 12 GPa while the material enters a collapsed tetragonal phase. The Fe-magnetic state change is proposed to account for the structural evolution superconductivity.
Authors:
; ; ; ;  [1] ;  [2] ;  [2]
  1. (SCUT-China)
  2. (
Publication Date:
OSTI Identifier:
1038601
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physica C; Journal Volume: 474; Journal Issue: 03, 2012
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
FOREIGNDOE - BASIC ENERGY SCIENCES
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPRESSION; DIFFRACTION; LATTICE PARAMETERS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; SYNCHROTRONS; X-RAY DIFFRACTION