Lee, C. H., Steffens, P., Qureshi, N., Nakajima, M., Kihou, K., Iyo, A., Eisaki, H. and Braden, M. (2013). Universality of the Dispersive Spin-Resonance Mode in Superconducting BaFe2As2. Phys. Rev. Lett., 111 (16). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Spin fluctuations in superconducting BaFe2(As1-xPx)(2) (x = 0.34, T-c = 29.5 K) are studied using inelastic neutron scattering. Well-defined commensurate magnetic signals are observed at (pi, 0), which is consistent with the nesting vector of the Fermi surface. Antiferromagnetic (AFM) spin fluctuations in the normal state exhibit a three-dimensional character reminiscent of the AFM order in nondoped BaFe2As2. A clear spin gap is observed in the superconducting phase forming a peak whose energy is significantly dispersed along the c axis. The bandwidth of dispersion becomes larger with approaching the AFM ordered phase universally in all superconducting BaFe2As2, indicating that the dispersive feature is attributed to three-dimensional AFM correlations. The results suggest a strong relationship between the magnetism and superconductivity.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Lee, C. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steffens, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qureshi, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakajima, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kihou, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Iyo, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eisaki, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-473968
DOI: 10.1103/PhysRevLett.111.167002
Journal or Publication Title: Phys. Rev. Lett.
Volume: 111
Number: 16
Date: 2013
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
NEUTRON-SCATTERING; EXCITATIONSMultiple languages
Physics, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/47396

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