Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
By A. Kreyssig, M. Green, Y. Lee, G. Samolyuk, P. Zajdel, J. W. Lynn, S. Bud’ko, M. Torikachvili, N. Ni, S. Nandi and 7 more. 2008
241 citations recorded by the source corpus.
Recent investigations of the superconducting iron-arsenide families have highlighted the role of pressure, be it chemical or mechanical, in fostering superconductivity. Here we report that CaFe2As2 undergoes a pressure-induced transition to a nonmagnetic volume "collapsed" tetragonal phase, which becomes superconducting at lower temperature. Spin-polarized total-energy calculations on the collapsed structure reveal that the magnetic Fe moment itself collapses, consistent with the absence of magnetic order in neutron diffraction. © 2008 The American Physical Society.
Subfields: Accounting, Electronic, Optical and Magnetic Materials, Strategy and Management
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Citations in the corpus
- A key role for unusual spin dynamics in ferropnictides (2008, background): “Suppression of the static long-range magnetic order by doping has hardly any influence on the crystal structure, whereas suppression of the same by pressure is accompanied by a sharp drop in c / a ratio (and, correspondingly, the Fe–As bond length”
- Superconductivity in iron compounds (2011, background): “In addition, this pressure work on CaFe2As2 found a new, additional transition [identified later (Kreyssig et al., 2008), as a ‘‘collapsed’’ tetragonal structure] at 100 K that appeared at 0.55 GPa and moved to higher temperature with increasing pressure.”