Anisotropic and quasipropagating spin excitations in superconducting Ba(Fe0.926Co0.074)2As2
H.-F. Li, C. Broholm, D. Vaknin, R. M. Fernandes, D. L. Abernathy, M. B. Stone, D. K. Pratt, W. Tian, Y. Qiu, N. Ni, S. O. Diallo, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, R. J. McQueeney
DOI 10.1103/PhysRevB.82.140503 · Physical Review B
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Abstract
Inelastic neutron scattering from superconducting (SC) Ba(Fe0.926Co0.074)2As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to QAFM=(1212) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1−J2 model with J1/J2∼1. The spin resonance at ∼8.3 meV in the SC state displays the same anisotropy. The anisotropic fluctuations experimentally evolve into two distinct maxima only along the direction transverse to QAFM above ∼80 meV indicating unusual quasipropagating excitations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.926Co0.074)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22.2 | Pressure not reported | unknown |
| Ba(Fe0.935Co0.065)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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