Superconductivity of graphite intercalation compounds with alkali-metal amalgams

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.25.4583· OSTI ID:6598111

Iye, Y; Tanuma, S

Superconductivity of the alkali-metal amalgam graphite intercalation compounds of stage 1 (C/sub 4/KHg, C/sub 4/RbHg) and stage 2 (C/sub 8/KHg, C/sub 8/RbHg) has been studied as well as that of the pristine amalgams (KHg, RbHg). The transition temperatures are 0.73, 0.99, 1.90, and 1.40 K for C/sub 4/KHg, C/sub 4/RbHg, C/sub 8/KHg, and C/sub 8/RbHg, respectively. The critical-field anisotropy ratio H/sup parallel//sub c/2/H/sup perpendicular//sub c/2 is about 10 for the stage 1 and about 15 to 40 for the stage 2. It is argued that electrons in the intercalant bands rather than the graphitic bands play the main role in the superconductivity. An interesting feature is that the stage-2 compound, which has a lower density of states at the Fermi level, has a higher transition temperature than the corresponding state-1 compound.

• Research Organization: The Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo, 106 Japan
• OSTI ID: 6598111
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 25:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALLOYS
ANISOTROPY
CARBON
CLATHRATES
CRITICAL FIELD
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTAL MINERALS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
FERMI LEVEL
GRAPHITE
INFORMATION
MAGNETIC FIELDS
MERCURY ALLOYS
MINERALS
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE