Peculiarities of radio frequency YBa[sub 2]Cu[sub 3]O[sub 7-x] superconducting quantum interference device response with a finite amplitude of the second harmonic in the current-phase relationship

Il'ichev, E.
November 2000
Applied Physics Letters;11/20/2000, Vol. 77 Issue 21
Academic Journal
The signal properties of radio frequency (rf) (SQUIDs) based on YBa[sub 2]Cu[sub 3]O[sub 7-x] symmetrical 30° and asymmetrical 45° grain-boundary Josephson junctions have been experimentally investigated. Both amplitude as well as phase detection have been used to read out the SQUID output signal. Comparison of the SQUID output signals to each other is given. It is shown that peculiarities of the rf SQUID response of SQUIDs with a 45° grain-boundary Josephson junction are consistent with an unconventional current-phase relation (CPR) of the Josephson junction, namely, the CPR contains a finite amplitude of the second harmonic. © 2000 American Institute of Physics.


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