Suppression of antiferromagnetic spin fluctuations in the collapsed phase of CaFe2As2

TitleSuppression of antiferromagnetic spin fluctuations in the collapsed phase of CaFe2As2
Publication TypeJournal Article
Year of Publication2009
AuthorsPratt DK, Zhao Y, Kimber SAJ, Hiess A, Argyriou DN, Broholm C, Kreyssig A, Nandi S, Bud'ko SL, Ni N, Canfield PC, McQueeney RJ, Goldman AI
Journal TitlePhysical Review B
Volume79
Pages060510
Date Published02/01
ISBN Number1098-0121
Accession NumberISI:000263815600022
Keywordsantiferromagnetic materials, calcium compounds, magnetic superconductors, neutron diffraction, neutron-scattering, spin fluctuations, superconductivity
Abstract

Inelastic neutron-scattering measurements of CaFe2As2 under applied hydrostatic pressure show that the antiferromagnetic spin fluctuations observed in the ambient pressure, paramagnetic, and 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 phases. The suppression or absence of static antiferromagnetic order and dynamic spin fluctuations in the nonsuperconducting cT phase supports the notion of a coupling between spin fluctuations and superconductivity in the iron arsenides.

URL<Go to ISI>://000263815600022
DOI10.1103/Physrevb.79.060510