High frequency microwave emission from BSCCO intrinsic junctions

HTS Josephson plasma oscillator

“…Typical junction areas are 40 × 40 µm 2 for figure 2(a) and 20 × 100 µm 2 for figure 2(b). On the other hand, for the singlecrystal samples, a BSCCO crystal [15] was patterned into a mesa structure by the following processes [16]. First, after cleaving the crystal, an Au film 50 nm thick was deposited on the cleaved surface of the crystal and annealed in air at 600 • C for several hours.…”

“…The mesa-type sample fabricated on a BSCCO single crystal exhibited the multibranch structures in the current-voltage (I -V ) characteristics, characteristic of the intrinsic Josephson junctions [9,10]. The 25-multibranch structures were observable.…”

“…Curves B 1 and B 2 correspond to the relatively weak injection case for which the Josephson plasma peak is clear, while curves C 1 and C 2 correspond to the strong injection case for which it is washed away. Experimentally, several reports suggesting Josephson plasma emission appeared quite recently [6][7][8][9][10][11][12]. The intensive quasiparticle injection into a c-axis oriented YBCO film induced a broad range of microwave emissions, while that into the c-axis direction of a BSCCO crystal induced both broadband and sharp nonequilibrium emissions.…”

“…We here present a brief review of these novel microwave emissions from a quasiparticle-injected nonequilibrium high-T c superconductor observed recently [6][7][8][9][10][11][12]…”