Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe2As2: Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds

TitleInelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe2As2: Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds
Publication TypeJournal Article
Year of Publication2013
AuthorsSoh JH, Tucker GS, Pratt DK, Abernathy DL, Stone MB, Ran S, Bud'ko SL, Canfield PC, Kreyssig A, McQueeney RJ, Goldman AI
Journal TitlePhysical Review Letters
Volume111
Pages227002
Date Published11
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000327941100019
Keywordsambient, high-temperature superconductivity, pressure
Abstract

The relationship between antiferromagnetic spin fluctuations and superconductivity has become a central topic of research in studies of superconductivity in the iron pnictides. We present unambiguous evidence of the absence of magnetic fluctuations in the nonsuperconducting collapsed tetragonal phase of CaFe2As2 via inelastic neutron scattering time-of-flight data, which is consistent with the view that spin fluctuations are a necessary ingredient for unconventional superconductivity in the iron pnictides. We demonstrate that the collapsed tetragonal phase of CaFe2As2 is nonmagnetic, and discuss this result in light of recent reports of high-temperature superconductivity in the collapsed tetragonal phase of closely related compounds.

URL<Go to ISI>://WOS:000327941100019
DOI10.1103/PhysRevLett.111.227002