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Magnetic penetration depth in the organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(NCS) sub 2

Journal Article · · Physical Review Letters; (USA)
; ; ; ; ;  [1]; ;  [2];  [3]
  1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (USA)
  2. University of British Columbia, Vancouver, British Columbia, Canada V6T2A6 (CA)
  3. Department of Applied Physics, Stanford University, Stanford, California 94305 (USA)
+ Show Author Affiliations

We report the first direct measurement of the effective magnetic penetration depth in oriented single crystals of {kappa}-(BEDT-TTF){sub 2}Cu(NCS){sub 2}, with {ital T}{sub {ital c}}(5 G){approx}9 K. Results yield an effective in-plane value of {lambda}{sub {ital e}{ital f}{ital f}}{sup {ital b}{ital c}}(0){approx}9800 A (for {ital H}{sub ext}{approx}3 kG), and a temperature dependence consistent with conventional {ital s}-wave pairing. Comparison with the London penetration depth, {lambda}{sub {ital L}}(0) (estimated to be {approx}5100 A), indicates a tendency toward dirty-limit superconductivity, with the ratio of coherence length over mean free path of {xi}{sub 0}{sup {ital b}{ital c}}/{ital l}{sub {ital b}{ital c}}{approx}2.7. From our results, it appears unnecessary to invoke any unconventional pairing schemes to explain the superconductivity in this material.

OSTI ID:
6904081
Journal Information:
Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:11; ISSN PRLTA; ISSN 0031-9007
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BEDT-TTF
CARBON COMPOUNDS
CARBON NITRIDES
CARBON SULFIDES
CHALCOGENIDES
COHERENCE LENGTH
COMPLEXES
COPPER COMPLEXES
CORRELATIONS
DATA
DIMENSIONS
ELECTRON PAIRS
EQUATIONS
EXPERIMENTAL DATA
FUNCTIONS
GAUSS FUNCTION
HETEROCYCLIC COMPOUNDS
INFORMATION
LENGTH
LONDON EQUATION
MAGNETIZATION
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANIC SUPERCONDUCTORS
PARTIAL WAVES
PENETRATION DEPTH
PHYSICAL PROPERTIES
PNICTIDES
RELAXATION
S WAVES
SULFIDES
SULFUR COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPLEXES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE