Structural properties of BaFe[subscript 1.8]Ni[subscript 0.2]As[subscript 2] under pressure
- SCUT-China
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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- FOREIGNDOE - BASIC ENERGY SCIENCES
- OSTI ID:
- 1038601
- Journal Information:
- Physica C, Vol. 474, Issue 03, 2012; ISSN 0921-4534
- Country of Publication:
- United States
- Language:
- ENGLISH
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