A laser ablation process was developed to pattern thin-film superconducting devices with 1- mu m resolution. The process was utilized to fabricate bridge structures in high T/sub c/(>90 K) YBaCuO ...superconducting thin films sputtered on various substrates. For bridges patterned on thin films with a high degree of polycrystallinity, the authors observed weak-link Josephson behaviour, from 4.2 K up to T/sub c/. The weak-link behaviour was attributed to grain-boundary superconducting tunneling. The results suggest that direct laser patterning can be a powerful technique for evaluation and optimization of prototype superconducting devices.< >
The process e
+e
− → hA is used to search for the Higgs bosons of the Minimal Supersymmetric Standard Model (MSSM), in the b
b
b
b
and
τ
+τ
−
b
b
final states. The search is performed in the data ...collected by the ALEPH experiment at LEP, at centre-of-mass energies between 130 and 172 GeV and with a total luminosity of 27.2 pb
−1. No candidate events are found in either of the final states, in agreement with the expected background of 0.91 events from all Standard Model processes. Combined with searches for e
+e
− → hZ, this results in a 95% C.L. lower limit on the masses of both h and A of 62.5 GeV/
c
2, for tan β > 1.
PDF
