Specific Heat and Magnetoresistance of Y-, Tl- and Bi-Type High-Temperature Superconductors

• Authors: R. Zalecki , A. Kozłowski , A. Kołodziejczyk , G. Gritzner , M. Mair
• Languages of publication: EN

Abstracts

EN

Specific heat of polycrystalline DyBa_{2}Cu_{3}O_{7} and Tl_{0.58}Pb _{0.42}Sr_{1.6}Ba_{0.4}Ca_{2}Cu_{3}O_{9} samples, as well as the single crystal of Bi_{2}Sr_{2}CaCu_{2}O_{8} have been measured within the temperature interval from 50 to 250 K. For Dy- and Tl-specimens the pronounced jump in specific heat and apparent contribution from Gaussian fluctuations of superconducting order parameter close to T_{c} have been observed. In contrary, for Bi-specimen only a rounded maximum within a broad interval around T_{c} has been detected. Magnetoresistance measurements as a function of temperature just below T_{c} have been carried out for Dy- and Tl-samples and the slopes of upper critical fields have been determined. The data have been analysed within a frame of Ginzburg-Landau-Abrikosov- Gorkov theory with additional Gaussian-like fluctuation term. The electronic specific heat coefficients γ, and the coherence length χ have been obtained.

Keywords

EN

74.72.Fq; 74.25.Ha; 74.72.Bk; 74.72.Hs; 74.25.Bt

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 91
• Issue: 2
• Pages: 431-434

Dates

published

1997-02

Contributors

author

R. Zalecki

• Department of Solid State Physics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland

author

A. Kozłowski

• Department of Solid State Physics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland

author

A. Kołodziejczyk

• Department of Solid State Physics, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland

author

G. Gritzner

• Johannes Kepler University, Institut of Chemical Technology, 4040 Linz, Austria

author

M. Mair

• Johannes Kepler University, Institut of Chemical Technology, 4040 Linz, Austria