TY - JOUR

T1 - Hc2 of Y1Ba2Cu3O7-δ thin films from conductivity fluctuations

AU - Racah, Daniel

AU - Kapitulnik, Aharon

AU - Deutscher, Guy

N1 - Funding Information:
4. CONCLUSIONS Measuremeonft t her esistivter ansitionosf YBCO films in appliedf ieldsand analysisin the frameworko f the theoryo f Ullah and Dorsey gives a good fit of the datat o the theory,w ith estimateddH cJdT of-(1.4-1.8)T/Kfo r H//c and-10T/K for H//ab, in agreemenwt ith previous estimate\s[ 6,7\]. This work was supportedin part by the Oren FamilyC hairo f ExperimentSalo lidS tateP hysics.

PY - 1994/2/2

Y1 - 1994/2/2

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0028759277&partnerID=8YFLogxK

U2 - 10.1016/0921-4526(94)91399-4

DO - 10.1016/0921-4526(94)91399-4

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AN - SCOPUS:0028759277

VL - 194-196

SP - 1799

EP - 1800

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

IS - PART 2

ER -