Title :
n-value and second derivative of the superconductor voltage-current characteristic
Author :
Goodrich, L.F. ; Srivastava, A.N. ; Yuyama, M. ; Wada, H.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors studied the n-value (V varies as I/sup n/) and second derivative (d/sup 2/V/dI/sup 2/) of the voltage-current curve of high- and low-temperature superconductors and superconductor simulators. They used these parameters for diagnosing problems with sample heating and data acquisition, and as indicators of the superconducting-to-normal state transition. The superconductor simulator may be useful in testing the measurement system integrity and reducing measurement variability since its characteristics are highly repeatable.<>
Keywords :
high-temperature superconductors; superconducting transition temperature; type II superconductors; high temperature superconductors; low-temperature superconductors; n-value; sample heating; second derivative; superconductor-normal transition; voltage-current characteristic; Critical current; Data acquisition; Electrical resistance measurement; Heating; High temperature superconductors; NIST; Smoothing methods; Superconducting device noise; Superconducting filters; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
