Shubnikov-de Haas experiments on potassium-hydrogen-graphite intercalation compounds (KH/sub x/-GIC's),

Journal Article · Wed Jan 15 04:00:00 EST 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.33.1292· OSTI ID:6302807

Enoki, T; Yeh, N; Chen, S; Dresselhaus, M S

Potassium-hydrogen-graphite ternary compounds (KH/sub x/-GIC, 0 < x < 1) are donor-type compounds containing an ionic intercalant K H . Basically the effect of hydrogen addition is the uptake of electrons from the potassium so that fewer electrons are available for conduction in the graphite bands. To obtain Fermi-surface information directly, Shubnikov--de Haas (SdH) measurements were carried out on stage-1, -2, and -4 KH/sub x/-GIC's. The results are compared with the electronic properties of K-GIC's and KHg/sub x/-GIC's. The observed oscillations are qualitatively modeled using the three-dimensional dilute-limit model. These Fermi-surface results are related to other experiments on KH/sub x/-GIC's, such as magnetic susceptibility, electronic specific heat, Raman scattering, and superconductivity. For example, it is found that because of the strong electron affinity of hydrogen, the charge transfer to hydrogen and graphite in stage-2 KH/sub x/-GIC's completely depletes the electrons in the potassium conduction band, consistent with the experimental specific-heat results. The basic conclusion that the uptake of hydrogen results in a lower electron concentration in the graphite bands is supported by all experiments.

• Research Organization: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• DOE Contract Number: AC02-83ER45041
• OSTI ID: 6302807
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 33:2; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
CAPTURE
CARBON
CLATHRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON CAPTURE
ELEMENTAL MINERALS
ELEMENTS
ENERGY LEVELS
FERMI LEVEL
GRAPHITE
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
MINERALS
NONMETALS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM HYDRIDES
SHUBNIKOV-DE HAAS EFFECT