Doping dependence of spin dynamics in electron-doped Ba(Fe1−⁢Co)2⁢As2

Published

August 18, 2010

Author(s)

K. Matan, S. Ibuka, R. Morinaga, Song Xue Chi, Jeffrey Lynn, A. D. Christianson, M. D. Lumsden, T. J. Sato

Abstract

The spin dynamics in single crystal, electron-doped Ba(Fe1−⁢Co)2⁢As2 has been investigated by inelastic neutron scattering over the full range from undoped to the overdoped regime. We observe damped magnetic fluctuations in the normal state of the optimally doped compound (=0.06) that share a remarkable similarity with those in the paramagnetic state of the parent compound (=0). In the overdoped superconducting compound (=0.14), magnetic excitations show a gaplike behavior, possibly related to a topological change in the hole Fermi surface (Lifshitz transition) while the imaginary part of the spin susceptibility ″ prominently resembles that of the overdoped cuprates. For the heavily overdoped, nonsuperconducting compound (=0.24) the magnetic scattering disappears, which could be attributed to the absence of a hole Fermi-surface pocket observed by photoemission.

Citation

Physical Review B

Volume

82

Issue

5

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevB.82.054515

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Keywords

Magnetic Superconductor, Spin Dynamics, Doping Dependence, Neutron Scattering, Iron-based superconductors, Lifshitz Transition

Citation

Matan, K. , Ibuka, S. , Morinaga, R. , Chi, S. , Lynn, J. , Christianson, A. , Lumsden, M. and Sato, T. (2010), Doping dependence of spin dynamics in electron-doped Ba(Fe1−�⁢Co�)2⁢As2, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.82.054515, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904810 (Accessed October 1, 2025)