Magnetic field penetration depth of an organic superconductor: Evidence for anisotropic superconductivity of gapless nature

Journal Article · Mon Sep 03 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.1271· OSTI ID:6337620

Kanoda, K; Akiba, K; Suzuki, K; Takahashi, T ^[1]; Saito, G ^[2]

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1. Department of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171 (Japan)
2. Department of Chemistry, Kyoto University, Sakyo-ku, Kyoto 606 (Japan)

The temperature dependence of the magnetic-field penetration depth {lambda} of the organic superconductor {kappa}-({ital bis}(ethylenedithio)-tetrathiafulvalene){sub 2}Cu(NCS){sub 2} has been determined by means of complex susceptibility measurements for single crystals. {lambda} was found to follow a power law, {lambda}({ital T})/{lambda}(0){minus}1{proportional to}({ital T}/{Tc}){sup 2}, at low temperatures instead of the exponential behavior expected from BCS theory. This result is considered as the first evidence for anisotropic superconductivity with nodes of the gap parameter on the Fermi surface in this material.

• OSTI ID: 6337620
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:10; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANISOTROPY
BEDT-TTF
COPPER COMPOUNDS
CRYSTALS
DATA
ENERGY LEVELS
EXPERIMENTAL DATA
FERMI LEVEL
HETEROCYCLIC COMPOUNDS
INFORMATION
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANIC SUPERCONDUCTORS
PENETRATION DEPTH
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE