Influence of the inclination of columnar defects on the reversible magnetization of high-Tc superconductors
V. Hardy, S. Hébert, M. Hervieu, Ch. Simon, J. Provost, A. Wahl, A. Ruyter
DOI 10.1103/PhysRevB.58.15218 · Physical Review B
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Abstract
Reversible magnetization has been studied in crystals of highly anisotropic high-Tc superconductors, containing columnar defects oriented either along the c axis or at an angle θi from it. With the magnetic field applied along c, a similar dip in the M−vs−ln(B) curves is observed for both track orientations. The location of this dip is shown to be related to Bcd, the field at which the vortex and track densities per ab plane are the same. The vortex pinning energy, extracted from the low field regime, is found to be slightly larger for θi=60° than for θi=0°. This effect is ascribed to the larger size of the track projections on the ab planes, in the case of inclined tracks. On the basis of the random nature of the track distribution, a model is proposed to account for the smooth character of the crossover between the low field (B≪Bcd) and high field (B≫Bcd) regimes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | unknown |
| Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | Pressure not reported | unknown |
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