Magnetic penetration depth and fluxon-line dynamics in the organic superconductor [kappa]-[BEDT-TTF][sub 2]Cu[NCS][sub 2]

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.12990· OSTI ID:6664534

Harshman, D R; Fiory, A T; Haddon, R C; Kaplan, M L ^[1]; Pfiz, T ^[2]; Koster, E; Shinkoda, I; Williams, D L ^[3]

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1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
2. Max Planck Institute, Stuttgart (Germany)
3. University of British Columbia, Vancouver, British Columbia, V6T 2A6 (Canada)

The muon-spin-relaxation ([mu]SR) technique has been used to study the internal field modulation dynamics of fluxons in crystals of [kappa]-[BEDT-TTF][sub 2]Cu[NCS][sub 2] ([ital T][sub [ital c]][approx]10.5 K). The data exhibit a strong field dependence for applied fields in the range 129 Oe[le][vert bar][bold H][sub ext][vert bar][le]4 kOe, which is attributed to a combination of vortex motion, finite core size effects, and pinning. In low fields ([vert bar][bold H][sub ext][vert bar]=129 Oe), the data exhibit a flux-pinning transition at [ital T][sub [ital x]][similar to]5 K, as evidenced by a peak in the second moment of the local field distribution at [similar to]5 K accompanied by an enhanced minimum in the first moment at the same temperature. In higher fields ([vert bar][bold H][sub ext][vert bar]=750 Oe, 3 kOe, and 4 kOe), where the effects of motion and pinning are minimized, the symmetry of the underlying gap function is confirmed as [ital s] wave. Corrections for finite fluxon core, finite mean free path, and flux-lattice disorder were applied in determining the London penetration depth, [lambda][sub [ital L]][sup ([ital b][ital c])](0)=7680[plus minus]700 A.

• OSTI ID: 6664534
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 49:18; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BEDT-TTF
PENETRATION DEPTH
COPPER COMPOUNDS
ORGANIC SUPERCONDUCTORS
ORGANOMETALLIC COMPOUNDS
DYNAMICS
MUON SPIN RELAXATION
HETEROCYCLIC COMPOUNDS
MECHANICS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
RELAXATION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360607* - Other Materials- Superconducting Properties- (1992-)