Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2

Details Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2 Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2

2008-12-21

arxiv.org/abs/0812.4056v1

Physics

Condensed Matter

Superconductivity

14 pages, 3 figures

Scientific paper

10.1103/PhysRevB.79.060510

Inelastic neutron scattering measurements of CaFe2As2 under applied hydrostatic pressure show that the antiferromagnetic spin fluctuations observed in the ambient pressure, paramagnetic, tetragonal (T) phase are strongly suppressed, if not absent, in the collapsed tetragonal (cT) phase. These results are consistent with a quenched Fe moment in the cT phase and the strong decrease in resistivity observed upon crossing the boundary from the T to cT phase. The suppression or absence of static antiferromagnetic order and dynamic spin fluctuations in the non-superconducting cT phase supports the notion of a coupling between spin fluctuations and superconductivity in the iron arsenides.

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