Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
11-27-2013
Journal or Book Title
Physical Review Letters
Volume
111
Issue
22
First Page
227002
DOI
10.1103/PhysRevLett.111.227002
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.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Soh, Jing-Han; Tucker, Gregory S.; Pratt, Daniel K.; Abernathy, D. L.; Stone, M. B.; Ran, Sheng; Bud’ko, Sergey L.; Canfield, Paul C.; Kreyssig, Andreas; McQueeney, Robert J.; and Goldman, Alan I., "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" (2013). Physics and Astronomy Publications. 636.
https://lib.dr.iastate.edu/physastro_pubs/636
Comments
This article is published as Soh, Jing-Han, Gregory S. Tucker, Daniel K. Pratt, D. L. Abernathy, M. B. Stone, Sheng Ran, Sergey L. Bud’ko, P. C. Canfield A. Kreyssig, R. J. McQueeney, and A. I. Goldman "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." Physical Review Letters 111, no. 22 (2013): 227002. DOI: 10.1103/PhysRevLett.111.227002.