Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs

被引：26

作者：

Knolle, J. ^{[1
]}

Zabolotnyy, V. B. ^{[2
]}

Eremin, I. ^{[3
,8
]}

Borisenko, S. V. ^{[2
]}

Qureshi, N. ^{[4
]}

Braden, M. ^{[4
]}

Evtushinsky, D. V. ^{[2
]}

Kim, T. K. ^{[2
,5
,6
]}

Kordyuk, A. A. ^{[2
]}

Sykora, S. ^{[2
]}

Hess, Ch. ^{[2
]}

Morozov, I. V. ^{[2
]}

Wurmehl, S. ^{[2
]}

Moessner, R. ^{[1
]}

Buechner, B. ^{[2
,7
]}

机构：

[1] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[2] Leibniz Inst Festkorper & Werkstoffforsch Dresden, D-01171 Dresden, Germany

[3] Ruhr Univ Bochum, Inst Theoret Phys 3, D-44801 Bochum, Germany

[4] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[5] Diamond Light Source, Didcot OX11 0DE, Oxon, England

[6] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[7] Tech Univ Dresden, Inst Festkorperphys, D-01171 Dresden, Germany

[8] Kazan Fed Univ, Kazan 420008, Russia

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 17期

关键词：

SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.86.174519

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

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