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.

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.

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

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