Hc2 of Y1Ba2Cu3O7-δ thin films from conductivity fluctuations

Daniel Racah, Aharon Kapitulnik, Guy Deutscher

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We have measured the resistive transitions of c-axis oriented YBCO thin films in applied magnetic fields for both H {norm of matrix} ab planes and H {norm of matrix} c axis up to 8T. We have analyzed the data using the 3D fluctuation theory of Ullah and Dorsey, and found a good fit to the predicted scaling function above and below the onset of the transition. The deduced Tc(H) is linear in all the field range, and the extracted dHc2/dT values for both of the field orientations are very close to the accepted one, i.e. -(dHc2/dT)=(1.4-1.8) T/K for H parallel to the c-axis (1.4 T/K is the slope derived for one sample and 1.8 T/K is the slope for two other samples) and 10(T/K) for H parallel to the ab planes. For H dfnc; c, the upper critical field slopes from the fluctuation conductivity agree very well with the slopes estimated from the midpoints of the resistive transitions.

Original languageEnglish
Pages (from-to)1799-1800
Number of pages2
JournalPhysica B: Condensed Matter
Issue numberPART 2
StatePublished - 2 Feb 1994


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