Inversion of Meissner effect and granular disorder in Bi2 Sr2 CaCu2 O8+δssuperconductors
Ali E. Khalil
DOI 10.1103/PhysRevB.55.6625 · Physical Review B
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Abstract
An explanation for the paramagnetic Meissner effect, which was recently observed in Bi high-temperature superconductors, based on the nature of the granular disorder of the material is developed. This explanation takes into account the appearance of a first-order phase transition (superconductor to superconductor) around randomly distributed defects with localized superconducting states of different orbital momenta (LSn →LSn+1 ), where n is the angular momentum of the state. The transition between superconducting states below the critical temperature in the disordered system is accompanied by jumps of the magnetic moments. When the disordered nature of the defects is taken into account, a state with an average moment greater than zero in a certain domain of the phase space will be formed and the susceptibility M/H in this case will tend toward a finite positive value as H→0. A comparison between the experimental measurements of a Bi-2212 ceramic sample and the theoretical predictions of the model shows that they are in good agreement.
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. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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