1. Josephson plasma resonance inκ−(BEDT−TTF)2Cu(NCS)2
- Author
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C. P. McRaven, J. S. Qualls, Stephen Hill, M. M. Mola, James S. Brooks, and J. T. King
- Subjects
Superconductivity ,Physics ,Condensed matter physics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Plasma oscillation ,01 natural sciences ,Omega ,Plasma resonance ,Vortex ,Condensed Matter::Superconductivity ,Lattice (order) ,0103 physical sciences ,Organic superconductor ,010306 general physics ,0210 nano-technology ,Anisotropy - Abstract
A cavity perturbation technique is used to study the microwave response of the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}.$ Observation of a Josephson plasma resonance, below ${T}_{c}$ $(\ensuremath{\sim}10 \mathrm{K}),$ enables investigation of the vortex structure within the mixed state of this highly anisotropic, type-II superconductor. Contrary to previous assumptions, frequency-dependent studies (28\char21{}153 GHz) indicate that the squared plasma frequency $({\ensuremath{\omega}}_{p}^{2})$ depends exponentially on the magnetic-field strength. Such behavior has been predicted for a weakly pinned quasi-two-dimensional vortex lattice [Bulaevskii et al., Phys. Rev. Lett. 74, 801 (1995)]. Our data also suggests a transition in the vortex structure near the irreversibility line.
- Published
- 2000
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