FIR response of intrinsic Josephson junctions

Author

Rother, S. ; Koval, Y. ; Müller, P. ; Kleiner, R. ; Kasai, Y. ; Nakajima, K. ; Darula, M.

Author_Institution

Phys. Inst. III, Univ. Erlangen-Nurnberg, Germany

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1191

Lastpage

1194

Abstract

We present experiments on the far infrared response of intrinsic Josephson junctions in Bi₂Sr₂CaCu₂O_8+x (BSCCO). We detected first order Shapiro steps on resistive branches in a frequency range between 584 GHz and 2.5 THz. Due to the very low power coupled into the junctions the suppression of the critical current was only weak. With increasing number of junctions in the resistive state a higher amplitude of the Shapiro steps was measured. As the frequencies are well above the plasma frequency of our junctions, the steps are expected to be stable at any power level. To verify this, step heights were studied at various power levels as a function of frequency. The impedance matching of the system improved considerably when several junctions have switched into the resistive state

Keywords

Josephson effect; bismuth compounds; calcium compounds; high-temperature superconductors; impedance matching; infrared spectra; strontium compounds; BSCCO; Bi₂Sr₂CaCu₂O₈; Shapiro step; critical current; far infrared response; impedance matching; intrinsic Josephson junction; plasma frequency; resistive state; Finite impulse response filter; Frequency; Gas lasers; Impedance; Josephson junctions; Laser tuning; Lenses; Optical pumping; Pump lasers; Telephony;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919562

Filename

919562