Knolle, J., Zabolotnyy, V. B., Eremin, I., Borisenko, S. V., Qureshi, N., Braden, M., Evtushinsky, D. V., Kim, T. K., Kordyuk, A. A., Sykora, S., Hess, Ch., Morozov, I. V., Wurmehl, S., Moessner, R. and Buechner, B. (2012). Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs. Phys. Rev. B, 86 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Using the angle-resolved photoemission spectroscopy data accumulated over the whole Brillouin zone (BZ) in LiFeAs, we analyze the itinerant component of the dynamic spin susceptibility in this system in the normal and superconducting state. We identify the origin of the incommensurate magnetic inelastic neutron scattering ( INS) intensity as scattering between the electron pockets, centered around the (pi,pi) point of the BZ, and the large two-dimensional hole pocket, centered around the Gamma point of the BZ. As the magnitude of the superconducting gap within the large hole pocket is relatively small and angle dependent, we interpret the INS data in the superconducting state as a renormalization of the particle-hole continuum rather than a true spin exciton. Our comparison indicates that the INS data can be reasonably well described by both the sign-changing symmetry of the superconducting gap between electron and hole pockets and the sign-preserving gap, depending on the assumptions made for the fermionic damping.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Knolle, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zabolotnyy, V. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eremin, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borisenko, S. V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qureshi, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Evtushinsky, D. V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, T. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kordyuk, A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sykora, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hess, Ch.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morozov, I. V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wurmehl, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moessner, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buechner, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-478515
DOI: 10.1103/PhysRevB.86.174519
Journal or Publication Title: Phys. Rev. B
Volume: 86
Number: 17
Date: 2012
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUPERCONDUCTIVITYMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/47851

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