Thermal Fluctuations of (Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.9}Gd_{0.1})Cu_2O_{z} Bulk Superconductor

• Authors: W. Woch , M. Chrobak , A. Kołodziejczyk , G. Gritzner
• Languages of publication: EN

Abstracts

EN

We report on the critical fluctuations from the magnetoresistance measurements in polycrystalline (Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.9}Gd_{0.1})Cu_2O_{z} superconductor. The critical exponents have been calculated above the critical temperature T_{c} as well as in the temperatures interval close to the zero resistance critical temperature. Above T_{c} only Gaussian fluctuations have been observed in a three-dimensional fluctuating system. Additionally, far above T_{c} the applied magnetic field induces the crossover from 3D to 2D fluctuating system. At the temperatures range close to the zero critical temperature the properties of the weak links are dominating and the fluctuating phase in each grain becomes long-range ordered as a consequence of the activation of weak links between grains.

Keywords

EN

74.72.-h; 74.40.-n; 74.20.De; 74.25.Ha

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)
• 74.40.-n: Fluctuation phenomena
• 74.20.De: Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1059-1062

Dates

published

2012-05

Contributors

author

W. Woch

• Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

author

M. Chrobak

• Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

author

A. Kołodziejczyk

• Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland

author

G. Gritzner

• Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University, A-4040 Linz, Austria

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Identifiers

DOI

10.12693/APhysPolA.121.1059