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

100%

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.

Thermal, magnetic and electric properties of RMn2O5(R=Tb, Dy and Ho) based multiferroics

75%

Kumar N. P., Bharadwaj S., Reddy P. V.

Multiferroic Materials

2014

vol. 1

issue 1

A series of multiferroic materials with the compositional formula RMn2O5 (where R=Tb, Dy andHo)were prepared by the solid state reaction technique. After characterising the samples structurally, a systematic investigation of specific heat, magnetization and dielectric studies has been undertaken, over a temperature range of 4–300 K. Based on these studies, it has been observed that all the samples exhibit multiple transitions below 45 K. A large magnetic anisotropy, primarily originating from spin-orbit coupling of R3+ moments was clearly observed in these materials. Finally, the magneto-caloric effect (MCE) computations were also carried out, mainly to examine the feasibility of using these materials as magnetic refrigerants. Suitable qualitative explanations for the various phenomena observed in this investigation are given.

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1 Acta Physica Polonica A

1 Multiferroic Materials

1 2017

1 2014

1 Bharadwaj S.

1 Chlan V.

1 Kumar N. P.

1 Kuzian R.

1 Laguta V.

1 Marysko M.

1 Olekhnovich N.

1 Pushkarev A.

1 Radyush Y.

1 Raevskaya S.

1 Raevsky I.

1 Reddy P. V.

1 Stephanovich V.

1 Štěpánková H.

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

Thermal, magnetic and electric properties of RMn2O5(R=Tb, Dy and Ho) based multiferroics