Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe0.926 Co0.074)2 As2

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

Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe_0.926 Co_0.074)₂ As₂

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

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Abstract

Inelastic neutron scattering from superconducting (SC) Ba (Fe _0.926 Co_0.074)₂ As₂ reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to Q _AFM = (1 2 1 2) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe₂ As₂ compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J₁-J₂ model with J₁/J ₂ ∼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 Q_AFM above ∼80 meV indicating unusual quasipropagating excitations.

Original language	English (US)
Article number	140503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.82.140503
State	Published - Oct 12 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Li, H. F., Broholm, C., Vaknin, D., Fernandes, R. M., Abernathy, D. L., Stone, M. B., Pratt, D. K., Tian, W., Qiu, Y., Ni, N., Diallo, S. O., Zarestky, J. L., Bud'Ko, S. L., Canfield, P. C., & McQueeney, R. J. (2010). Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe_0.926 Co_0.074)₂ As₂. Physical Review B - Condensed Matter and Materials Physics, 82(14), Article 140503. https://doi.org/10.1103/PhysRevB.82.140503

Li, HF, Broholm, C, Vaknin, D, Fernandes, RM, Abernathy, DL, Stone, MB, Pratt, DK, Tian, W, Qiu, Y, Ni, N, Diallo, SO, Zarestky, JL, Bud'Ko, SL, Canfield, PC & McQueeney, RJ 2010, 'Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe_0.926 Co_0.074)₂ As₂', Physical Review B - Condensed Matter and Materials Physics, vol. 82, no. 14, 140503. https://doi.org/10.1103/PhysRevB.82.140503

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title = "Anisotropic and quasipropagating spin excitations in superconducting Ba (Fe0.926 Co0.074)2 As2",

abstract = "Inelastic neutron scattering from superconducting (SC) Ba (Fe 0.926 Co0.074)2 As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to Q AFM = (1 2 1 2) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2 As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1-J2 model with J1/J 2 ∼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.",

author = "Li, {H. F.} and C. Broholm and D. Vaknin and Fernandes, {R. M.} and Abernathy, {D. L.} and Stone, {M. B.} and Pratt, {D. K.} and W. Tian and Y. Qiu and N. Ni and Diallo, {S. O.} and Zarestky, {J. L.} and Bud'Ko, {S. L.} and Canfield, {P. C.} and McQueeney, {R. J.}",

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AU - Li, H. F.

AU - Broholm, C.

AU - Vaknin, D.

AU - Fernandes, R. M.

AU - Abernathy, D. L.

AU - Stone, M. B.

AU - Pratt, D. K.

AU - Tian, W.

AU - Qiu, Y.

AU - Ni, N.

AU - Diallo, S. O.

AU - Zarestky, J. L.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - McQueeney, R. J.

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N2 - Inelastic neutron scattering from superconducting (SC) Ba (Fe 0.926 Co0.074)2 As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to Q AFM = (1 2 1 2) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2 As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1-J2 model with J1/J 2 ∼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.

AB - Inelastic neutron scattering from superconducting (SC) Ba (Fe 0.926 Co0.074)2 As2 reveals anisotropic and quasi-two-dimensional (2D) magnetic excitations close to Q AFM = (1 2 1 2) - the 2D antiferromagnetic (AFM) wave vector of the parent BaFe2 As2 compound. The correlation length anisotropy of these low-energy fluctuations is consistent with spin nematic correlations in the J1-J2 model with J1/J 2 ∼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.

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