Measurement of the energy gap in an organic superconductor: Evidence for extremely strong coupling

Journal Article · Mon Aug 04 04:00:00 EDT 1986 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.57.629· OSTI ID:5111125

Hawley, M E; Gray, K E; Terris, B D; Wang, H H; Carlson, K D; Williams, J M

Point-contact tunneling is used to make what we believe to be the first measurement of a superconducting energy gap (..delta..) in an organic superconductor. For a ..beta..-(bis(ethylenedithio)tetrathiafulvalene)/sub 2/AuI /sub 2/ single crystal, ..delta.. shows consistent field and temperature dependences, but is more than 4 times larger than weak-coupling BCS, implying extremely strong coupling. We speculate that very low-frequency modes may be responsible.

• Research Organization: Materials Science and Technology and Chemistry Divisions, Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5111125
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 57:5; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKENES
BCS THEORY
COUPLING
CRYSTALS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
ETHYLENE
EXPERIMENTAL DATA
GOLD COMPOUNDS
GOLD IODIDES
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
INFORMATION
IODIDES
IODINE COMPOUNDS
MONOCRYSTALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT