Vortex pinning and lock-in effect in a layered superconductor with large in-plane anisotropy
- Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
We use ac susceptibility to study the vortex pinning force anisotropy and the magnetic lock-in effect in the organic superconductor (TMTSF){sub 2}ClO{sub 4}, which is believed to have an in-plane anisotropy of {gamma}{sub {ital b}{ital a}}{similar_to}10 and a maximum out-of-plane anisotropy {gamma}{sub {ital c}{ital a}}{similar_to}100. Our measurements show only weak effects of the in-plane anisotropy. The pinning force for Josephson vortices (parallel to the conducting planes) is nearly independent of their orientation, except for a small but narrow peak (full width at half maximum {congruent}6{degree}) when the vortices are parallel to the TMTSF stacks ({ital a} axis). The pinning force initially {ital decreases} {ital as} {ital the} {ital vortices} {ital unlock} {ital from} {ital the} {ital layers}, contrary to the behavior previously observed in the organic superconductor (BEDT-TTF){sub 2}Cu(SCN){sub 2}. The lock-in threshold field is only weakly dependent on the initial angle of the Josephson vortices in the {ital ab} plane.
- OSTI ID:
- 115865
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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