Comment on ‘‘Temporal response of a high‐c superconducting field‐effect transistor’’ [Appl. Phys. Lett. 67, 2076 (1995)]

See, e.g., J. Mannhart, D. G. Scholm, J. G. Bednorz, and K. A. Müller, Phys. Rev. Lett. 67, 2099 (1991); X. X. Xi, C. Doughty, A. Walkenhorst, C. Kwon, Q. Li, and T. Venkatesan, ibid. 68, 1240 (1992); T. Frey, J. Mannhart, J. G. Bednorz, and E. J. Williams, Phys. Rev. B 51, 3257 (1995).

N. Chandrasekhar, Oriol T. Valls, and A. M. Goldman, Phys. Rev. Lett. 71, 1079 (1993); Phys. Rev. B 49, 1620 (1994).

R.

Schneider

and

R.

Auer,

, ().

H. W. Ott, Noise Reduction Techniques in Electronic Systems, 2nd ed. (Wiley, Singapore, 1989).

For RC, the resistance required would be about 1000 Ω. With lead resistances of order, e.g., 1 milliohm/foot, the wires would have to be many kilometers long. For L/R, with a minimum value of the resistance given by the device itself (15 Ω) and the lead inductance as given in the text, one would need at least about 400 meters of wiring.

This frequency is a prefactor in the probability for the processes that over a much longer time lead to equilibration of the oxygen populations in the presence of a dc field.

The early time processes considered in this paragraph may lead to an oscillatory component which would provide an additional or alternative reason for the presence of oscillations in the SuFET device.

G.

Grigelionis,

E. E.

Tornau

, and

A.

Rosengren,

, ().