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

Research output: Contribution to journal › Article › peer-review

150 Scopus citations

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.",

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year = "2009",

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doi = "10.1103/PhysRevLett.103.087002",

language = "English",

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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.

UR - https://www.scopus.com/pages/publications/70349544155

U2 - 10.1103/PhysRevLett.103.087002

DO - 10.1103/PhysRevLett.103.087002

M3 - Article

AN - SCOPUS:70349544155

SN - 0031-9007

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 087002

ER -

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

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