Doping dependence of spin dynamics in electron-doped Ba(Fe1-xCox)2As2

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.82.054515· OSTI ID:1006456

Matan, K. ^[1]; Ibuka, S. ^[1]; Morinaga, R. ^[1]; Chi, Songxue ^[2]; Lynn, J W ^[3]; Christianson, Andrew D ^[4]; Lumsden, Mark D ^[4]; Sato, T. J. ^[1]

---

1. Univ. of Tokyo and JST, TRIP/Tokyo
2. NIST and Univ. of MD
3. NIST Center for Neutron Research (NCRN), Gaithersburg, MD
4. ORNL

The spin dynamics in single crystal, electron-doped Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} 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 (x=0.06) that share a remarkable similarity with those in the paramagnetic state of the parent compound (x=0). In the overdoped superconducting compound (x=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 {chi}' prominently resembles that of the overdoped cuprates. For the heavily overdoped, nonsuperconducting compound (x=0.24) the magnetic scattering disappears, which could be attributed to the absence of a hole Fermi-surface pocket observed by photoemission.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1006456
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 82; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIDES
BARIUM COMPOUNDS
COBALT ARSENIDES
DOPED MATERIALS
DYNAMICS
FERMI LEVEL
INELASTIC SCATTERING
IRON ARSENIDES
NEUTRON DIFFRACTION
SPIN