-
Article
Stress-induced comenditic trachyte effusion triggered by trachybasalt intrusion: multidisciplinary study of the AD 1761 eruption at Terceira Island (Azores)
The AD 1761 eruption on Terceira was the only historical subaerial event on the island and one of the last recorded in the Azores. The eruption occurred along the fissure zone that crosses the island and produ...
-
Article
Fabrication and test of a YBa2Cu3O7-δ three-pole band pass filter
We designed and fabricated a Tchebysheff three-pole bandpass microstrip filter with a center frequency off= 9.5 GHz and bandwidth at —3 dB of 0.8%. The device has been made with high-quality YBa2Cu307-δ (YBCO) fi...
-
Article
A new type of biepitaxialc-axis tilted YBCO Josephson junction
A novel fabrication procedure of high critical temperature superconductor Josephson junctions (HTCSJJ) has been developed by a 90° rotation of YBa2Cu3O7−x c-axis around an in-plane direction, on the basis of conc...
-
Article
Morphological and structural properties of high quality YBCO thin films
High-quality YBCO thin films have been grown by Inverted Cylindrical Magnetron Sputtering (ICMS) on LaAlO3(100), SrTiO3(100), SrTiO3(110), and MgO(100) substrates. Transition temperatures of c-axis films exceed 9...
-
Article
YBCO step-edge SQUIDs by magnetron sputtering technique
YBCO step-edge junction d.c. SQUIDs have been realized by using the Inverted Cylindrical Magnetron Sputtering (ICMS) technique. This last represents a novel technology for high-T c Josephson junct...
-
Article
Magnetic penetration depth measurements on high-temperature superconducting thin films and their implications
Accurate measurements of the magnetic penetration depth λ of n-doped (Nd1.85Ce0.15CuO4−δ) and p-doped (YBa2Cu3O7−δ) high-temperature superconductors using a microscopic resonator are reported. The temperature dep...
-
Article
Effect of nonhomogeneous high-critical-temperature electrodes on tunneling and point contact junction measurements
The effect of a nonhomogeneous base electrode on point contact spectroscopy is discussed in the framework of the proximity effect, and a phenomenological model is proposed. The appearance of zero-bias anomalie...
-
Article
In situ superconducting Y−Ba−Cu−O thin films by single-target r.f. magnetron sputtering
Superconductive thin films of Y−Ba−Cu−O have been grownin situ by r.f. magnetron sputtering from a single stoichiometric target on Al2O3 substrates. Zero-resistivity temperatures as high as 73 K have been achieve...
-
Article
A qualitative explanation of tunneling characteristics of high-T c junctions in terms of the McMillan proximity model
In this paper the influence of proximity effects on the transport properties of high-T c superconductors is considered. On the basis of the experimental results on tunneling spectroscopy reported in the current l...
-
Chapter
Thin Film Surface Resistance Measurements For Superconducting Cavity Applications
First attempts to use rf superconductivity for particle accelerators are dated more than thirty years ago [1–2]. Since then many efforts have been made in trying to develop high field rf superconducting caviti...
-
Article
Anomalies and proximity effect in high-T C tunnel junctions
Some of the main anomalies in conductance characteristics of high-T C tunnel junctions are considered. Mainly, the extreme, depression of gap structures, the presence of conductance peaks in corri...
-
Article
A study on the stability of superconducting YBa2Cu3O7−x phase
The thermal stability of the superconducting phase of nominal composition YBa2Cu3O7−x -sintered pellets has been studied with respect to different temperatures (ranging from 300 to 950° C), time (ranging from 1 t...
-
Article
Characterization of superconducting thin films by Mo75Re25 target for rf cavity applications
superconducting thin films by Mo75Re25 single-target magnetron sputtering at various temperatures on sapphire substrates were prepared. Sharp superconductive transitions andT c
-
Article
Nb/BiSCCO point conctact junctions
Preparation procedure and sample characterization of 112 BiSCCO pellets exhibiting high-T c superconductivity are discussed. TypicalI–V and dV/dI curves of Nb/BiSCCO point conctact junctions at va...
-
Article
Preliminary Results on YBCO/Nb Bulk Junction
Current-voltage characteristics and dV/dI curves of a YBCO/Nb bulk junction at 4.2 K are reported. The presence of the Josephosn effect is clearly shown. The dV/dI spectrum shows sharp structures which can be ...
-
Article
YBCO/Nb bulk junctions: Observation of the Josephson effect
The fabrication procedure of reliable YBCO-based bulk junctions with a Nb film as a counterelectrode is described. Typical currentvoltage characteristics are presented, clearly showing the presence of the Jose...
-
Chapter
Josephson Effect and Energy Gap Measurements from Nb/YBCO Point Contact Structures
Besides its intrinsic interest, weak coupling between superconductors is widely recognized as a powerful probe to infer important informations on the underlying physics of superconductivity in general1). Accordin...
-
Article
Temperature dependence of resistivity for thermally diffused V3Si multilayer films
Results concerning V3Si films produced by a simple annealed multilayer technique are reported together with X-ray diffraction patterns, Auger spectroscopy, and Rutherford backscattering analysis. Low-temperature ...
-
Article
Magnetic field penetration in niobium- and vanadium-based Josephson junctions
Measurements on the temperature dependence of the magnetic field penetration in Nb-NbxOy-Pb and V-VxOy-Pb Josephson junctions have been performed. Results on the zero-temperature penetration depth in niobium film...
-
Article
Temperature dependence of the maximum Josephson current in V-V x O y -Pb tunnel junctions
Measurements of the temperature dependence of the maximum dc Josephson current in V-V x O y -Pb tunnel structures have been performed. Junctions...
