Vortex phase diagram of Bi2Sr2CaCu2O8+δ: c-axis superconducting correlation in the different vortex phases
M. F. Goffman, J. A. Herbsommer, F. de la Cruz, T. W. Li, P. H. Kes
DOI 10.1103/PhysRevB.57.3663 · Physical Review B
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Abstract
The vortex phase diagram in Bi2Sr2CaCu2O8+δ is investigated by studying the linear ac transverse permeability μ⊥=μ⊥′+μ⊥″ (hac⊥H‖c axis) in a wide range of temperature and magnetic fields. At low fields (H<300Oe)superconducting phase coherence in the c direction shows that the ordered vortex solid state is characterized by a c-axis vortex correlation length lc limited by the sample thickness d. At low temperatures (T<20K) point disorder is sufficiently strong and the phase coherent ordered vortex solid becomes metastable. In the temperature range 20<T<42K when the applied field exceeds Hent(T), the ordered vortex state transforms into an entangled state with no indication of reduction of lc. At a higher crossover field the linear response becomes Ohmic, lc<d. At higher temperatures the vortex structure becomes an uncorrelated vortex liquid in all directions.
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. | 90.5 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure not reported | unknown |
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