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Cluster Superconductivity in the Magnetoelectric Pb(Fe_{1/2}Sb_{1/2})O₃ Ceramics

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Laguta V., Marysko M., Stephanovich V., Raevsky I., Olekhnovich N., Pushkarev A., Radyush Y., Raevskaya S., Kuzian R., Chlan V., Štěpánková H.

Acta Physica Polonica A

2017

vol. 131

issue 6

1534-1539

We report the observation of cluster (local) superconductivity in the magnetoelectric Pb(Fe_{1/2}Sb_{1/2})O₃ ceramics prepared at a hydrostatic pressure of 6 GPa and temperatures 1200-1800 K to stabilize the perovskite phase. The superconductivity is manifested by an abrupt drop of the magnetic susceptibility at the critical temperature T_{c} ≈7 K. Both the magnitude of this drop and T_{c} decrease with magnetic field increase. Similarly, the low-field paramagnetic absorption measured by EPR spectrometer drops significantly below T_{c} as well. The observed effects and their critical magnetic field dependence are interpreted as manifestation of the superconductivity and the Meissner effect in metallic Pb nanoclusters existing in the ceramics. Their volume fraction and average size were estimated as 0.1-0.2% and 140-150 nm, respectively. The superconductivity related effects disappear after oxidizing annealing of the ceramics.

Electronic structure predictions in Bi-O-S systems

100%

Morice C., Artacho E., Saxena S. S.

Novel Superconducting Materials

2015

vol. 1

issue 1

Bi4O4S3 was the first superconductor discovered in the BiS2 family of novel superconductors. The subfamily of Bi-O-S systems now expanded andwas probed both theoretically and experimentally. Here we review the experimentalwork done on the Bi-O-S compounds, and compare it with theoretical results obtained using ab-initio methods. In particular we calculate the charge carrier density using an ab-initio calculated density of states, and find a really close agreement with experimental data.

Surface morphology of PrBa2Cu3O7-δ single crystals after the long-lasting high-temperature reduction

100%

Łuszczek M., Sadowski W.

Open Physics

2003

vol. 1

issue 4

626-633

The results of the detailed scanning electron microscopy study of PrBa2Cu3O7-δ single crystals after the long-lasting high-temperature post-growth treatment are reported. The presence of the unstable decomposition products on the crystal surface indicates that the onset of superconductivity must be related to the structural transformations in the bulk (approximately 20% of the total volume of the examined crystals). The time-dependent character of the superconductivity in the Pr-123 crystals could be attributed to the migration of defects in the Pr−Ba sublattice from the bulk toward the surface.

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1 Acta Physica Polonica A

1 Novel Superconducting Materials

1 Open Physics

1 2017

1 2015

1 2003

1 Artacho E.

1 Chlan V.

1 Kuzian R.

1 Laguta V.

1 Marysko M.

1 Morice C.

1 Olekhnovich N.

1 Pushkarev A.

1 Radyush Y.

1 Raevskaya S.

1 Raevsky I.

1 Sadowski W.

1 Saxena S. S.

1 Stephanovich V.

1 Łuszczek M.

1 Štěpánková H.

Search results

Cluster Superconductivity in the Magnetoelectric Pb(Fe_{1/2}Sb_{1/2})O₃ Ceramics

Electronic structure predictions in Bi-O-S systems

Surface morphology of PrBa2Cu3O7-δ single crystals after the long-lasting high-temperature reduction