Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2

A. D. Christianson; M. D. Lumsden; S. E. Nagler; G. J. MacDougall; M. A. McGuire; A. S. Sefat; R. Jin; B. C. Sales; D. Mandrus

doi:10.1103/PhysRevLett.103.087002

Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2

A. D. Christianson, M. D. Lumsden, S. E. Nagler, G. J. MacDougall, M. A. McGuire, A. S. Sefat, R. Jin, B. C. Sales, D. Mandrus

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Abstract

We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through TC. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below TC additional intensity appears at an energy of ∼4.5(0.5)meV, similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below TC for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance, demonstrating the direct competition between static magnetic order and superconductivity.

Original language	English
Article number	087002
Journal	Physical Review Letters
Volume	103
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.103.087002
State	Published - Aug 19 2009

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title = "Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2",

abstract = "We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through TC. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below TC additional intensity appears at an energy of ∼4.5(0.5)meV, similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below TC for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance, demonstrating the direct competition between static magnetic order and superconductivity.",

author = "Christianson, {A. D.} and Lumsden, {M. D.} and Nagler, {S. E.} and MacDougall, {G. J.} and McGuire, {M. A.} and Sefat, {A. S.} and R. Jin and Sales, {B. C.} and D. Mandrus",

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doi = "10.1103/PhysRevLett.103.087002",

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T1 - Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2

AU - Christianson, A. D.

AU - Lumsden, M. D.

AU - Nagler, S. E.

AU - MacDougall, G. J.

AU - McGuire, M. A.

AU - Sefat, A. S.

AU - Jin, R.

AU - Sales, B. C.

AU - Mandrus, D.

PY - 2009/8/19

Y1 - 2009/8/19

N2 - We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through TC. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below TC additional intensity appears at an energy of ∼4.5(0.5)meV, similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below TC for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance, demonstrating the direct competition between static magnetic order and superconductivity.

AB - We report neutron scattering measurements on single crystals of BaFe1.92Co0.08As2. The magnetic Bragg peak intensity is reduced by 6% upon cooling through TC. The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional interactions. Below TC additional intensity appears at an energy of ∼4.5(0.5)meV, similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below TC for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance, demonstrating the direct competition between static magnetic order and superconductivity.

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DO - 10.1103/PhysRevLett.103.087002

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VL - 103

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Static and dynamic magnetism in underdoped superconductor BaFe1.92Co0.08As2

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