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
J. H. Soh, G. S. Tucker, D. K. Pratt, D. L. Abernathy, M. B. Stone, S. Ran, S. L. Bud’ko, P. C. Canfield, A. Kreyssig, R. J. McQueeney, A. I. Goldman
DOI 10.1103/PhysRevLett.111.227002 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| (Ca1-xSrx)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| (Ca1-xRx)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | unknown |
Similar papers
Structural, electronic, and magnetic properties of the possible pnictide superconductor BaFeAs2
similarity 0.93Zisheng Gong et al.
Source status unknown — claims are unverified
Hidden phase in parent Fe-pnictide superconductors
similarity 0.93Khadiza Ali et al.
Source status unknown — claims are unverified
Strong Coupling of the Fe-Spin State and the As-As Hybridization in Iron-Pnictide Superconductors from First-Principle Calculations
similarity 0.93T. Yildirim
Source status unknown — claims are unverified
Hydrostatic-pressure tuning of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1−xCox)2As2
similarity 0.92E. Gati et al.
Source status unknown — claims are unverified
Segregation of antiferromagnetism and high-temperature superconductivity in Ca1−xLaxFe2As2
similarity 0.92Shanta R. Saha et al.
Source status unknown — claims are unverified
Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2−xNixAs2
similarity 0.92Neeraj Kumar et al.
Source status unknown — claims are unverified