Josephson coupling in the vortex-liquid state of Bi2Sr2CaCu2O8+δ with columnar defects
Makoto Kosugi, Yuji Matsuda, Marat B. Gaifullin, Lev N. Bulaevskii, Noriko Chikumoto, Marcin Konczykowski, Jun-ichi Shimoyama, Kohji Kishio, Kazuto Hirata
DOI 10.1103/PhysRevB.59.8970 · Physical Review B
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Abstract
The interlayer Josephson coupling in the vortex-liquid phase of Bi2Sr2CaCu2O8+δ with columnar defects is studied by means of the Josephson plasma resonance. At high temperatures well above the Bose-glass melting line, double resonance peaks appear as a function of the magnetic field in a narrow temperature range deep within the vortex-liquid state. This indicates that two types of vortex liquid, the well-coupled and the decoupled pancake vortex liquids, appear in the irradiated crystals. The pancake vortices tend to align and couple with increasing magnetic field when it approaches approximately one-third of the matching field. From the angular and frequency dependences of the resonance, we estimate the c-axis correlation length of the pancake vortices quantitatively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85.7 | Pressure not reported | onset |
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