Clean Bulk YBaCuO Superconductors Doped by Paramagnetic Ions of Sm and Yb

• Authors: M. Jirsa , D. Volochová , J. Kováč , P. Diko
• Languages of publication: EN

Abstracts

EN

The recently developed clean cuprate technology was employed to study the effect of tiny amounts of paramagnetic Yb and Sm ions on electromagnetic properties of bulk YBaCuO. Small samples of about 1.5×1.5×0.5 mm³ were measured by vibrating sample magnetometer in the field range ±9 T and temperatures 30 K to 10 K in the non-superconducting tetragonal state and 300 K to 70 K in the orthorhombic, superconducting state. In the latter case, we observed the reversible paramagnetic moment above T_{C}, similar as in the tetragonal state. Below T_{C} an irreversible magnetic moment was observed from which critical current density, J_c, was evaluated using the extended Bean model. The effect of doping by Yb and Sm ions on J_c was studied and a correlation between J_c and the total paramagnetic moment was found. Both J_c(B) and the normalized pinning force density as a function of the reduced magnetic field were analyzed in terms of the classical model and discussed with respect to the material anisotropy, giving us at least a rough idea on the type of the effective pinning type and mechanism.

Keywords

EN

74.25.Ha; 74.25.Op; 74.25.Sv; 74.60.Ge; 74.72.-h

Discipline

• 74.72.-h: Cuprate superconductors
• 74.25.Ha: Magnetic properties including vortex structures and related phenomena(for vortices, magnetic bubbles, and magnetic domain structure, see 75.70.Kw)
• 74.25.Op: Mixed states, critical fields, and surface sheaths
• 74.25.Sv: Critical currents

• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1027-1029

Dates

published

2017-04

Contributors

author

M. Jirsa

• Institute of Physics, Czech Academy of Sciences, Na Slovance 2, CZ-18221 Praha 8, Czech Republic
• Institute of Plasma Physics, Czech Academy of Sciences, Za Slovankou 3, CZ-18200 Praha 8, Czech Republic

author

D. Volochová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

P. Diko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.131.1027