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Proceedings of Conferences

Session 5 "Superconductors at Microwaves"

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	High-Tc thin SQUID film gradiometers on 5Ч5 mm2 bicrystal (622.63 Kbytes) hot!	2004-06-29
High-T_C thin SQUID film gradiometers on 5Ч5 mm² bicrystal M. L. Chuharkin¹⁾, O. V. Snigirev¹⁾, and S. A. Gudoshnikov²⁾ ¹⁾ Physics Department, Moscow State University, Leninskie Gory 1, 119992, Moscow, Russia ²⁾ Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, IZMIRAN, Troitsk, Moscow Region 142190, Russia Abstract – Thin film dc SQUID gradiometers using a single YBa₂Cu₃O_7-δ layer and grain boundary Josephson junctions on 30° SrTiO₃ bicrystal substrates have been prepared. The planar gradiometer consists of two pickup loops galvanically coupled to the two small area SQUIDs with inductances of about of 30 pH and 45 pH. The gradiometric balance close to 500 has been obtained with base 2.3 mm. White noise level about 7 μΦ₀/Hz^1/2 or 2 pT/cm∙Hz^1/2 in unshielded environment at 77 K.
		hits: 1162

	Matching of input circuit in the microwave amplifier based on Josephson effect (215.26 Kbytes) hot!	2004-06-29
Matching of input circuit in the microwave amplifier based on Josephson effect A.N. Vasiliyev, B.V. Kalinin, N.Yu. Medvedeva Dept. of Electronics, St.-Petersburg Electrotechnical University, St.-Petersburg, 197376, Russia Abstract – The front end of a microwave SQUID amplifier in the form of an opened spiral microstrip line is considered. The microstrip line is coupled with the SQUID, which is current and flux biased. The full-wave analysis of the structure consisting of the opened spiral microstrip line and the SQUID coil has been curried out. In the considered model two Josephson junctions were replaced by equivalent normal resistors. The analysis shows that matching the input circuit can be achieved when the electric length of the opened spiral microstrip line is approximately equal to a quarter wavelength.
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	The array model of high-Tc josephson junctions (172.53 Kbytes) hot!	2004-06-29
The array model of high-Tc josephson junctions I. I. Soloviev and V. K. Kornev Physics Department, Moscow State University, Leninskie Gory 1, 119992, Moscow, Russia Abstract – The array model of the faceted bicrystal Josephson junctions has been developed and applied to the experimental data interpretation. The facet size and the facet critical current dependence on magnetic field are taken in to consideration. The model can be successfully used with the high-performance software meant for numerical simulation of the lumped Josephson junction circuits, e.g. PSCAN and WinS. The developed analytical approach has been applied to processing of the experimental data for the high-T_c bicrystal junctions fabricated by dc sputtering at high pressure.
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	Subharmonic Shapiro steps on I-V curve of underdemped Josephson junctions (157.36 Kbytes) hot!	2004-06-29
Subharmonic Shapiro steps on I-V curve of underdemped Josephson junctions T. Y. Karminskaya and V. K. Kornev Physics department, Moscow State University, Moscow 119992, Russia. Abstract - Analytical theory of both the harmonic and subharmonic Shapiro steps on I-V curve of underdamped Josephson junctions in the frame of the resistively shunted junction model has been developed. Domain of applicability of this theory is discussed, and the obtained analitical results are compared with those from numerical simulation.
		hits: 1237

	Phase Qubit Based on high-temperature Josephson Junctions (296.57 Kbytes) hot!	2004-06-29
Phase Qubit Based on high-temperature Josephson Junctions N. V. Klenov and V. K. Kornev Department. of Physics, Moscow State University, Moscow 119992, Russia Abstract – Novel type of phase qubit – the dc superconducting quantum interferometer containing Josephson junctions, which are characterized by a second harmonic in their current-phase relations - was suggested to be realized on the base of high-temperature superconductors. Detailed analysis of the dc interferometer energy versus magnetic field as well as quantum-mechanical behavior of the system are presented. Potentialities of the second harmonic evaluation from the interferometer critical current dependence on magnetic field are also considered. The impact of the second harmonic on the interferometer critical current versus applied magnetic field was analyzed numerically for different values of the normalized interferometer inductance.
		hits: 1246

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