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Josephson Network as a Model for Inhomogeneous Superconductor: a Microwave Power Absorption

100%
Rycerz A., Spałek J.
Acta Physica Polonica A
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2007
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vol. 111
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issue 4
581-594
EN
We discuss the applied magnetic field dependence of the microwave absorption by a three-dimensional array of up to 30×30 ×30 Josephson junctions with random parameters including the resistivity, capacity, and inductance of each junction. The numerical simulation results for the networks show characteristic microwave absorption anomalies observed in the ceramic samples of high temperature superconductor YBa_2Cu_3O_{7-x}. We also provide a discussion of the absorption in simple analytical terms of the Josephson loop instabilities.
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Two-Dimensional Ising Model with Competing Interactions as a Model for Interacting π-Rings

80%
O'Hare A., Kusmartsev F., Kugel K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
150-152
EN
We investigate the Ising model on a square lattice with antiferromagnetic exchange between nearest and next-nearest neighbors and show that at low temperatures stripe-like and droplet-like superstructures appear. We show that the competing interactions introduce a strong frustration that could plausibly describe the systems with dipole-dipole type interactions and pay particular attention to arrays of interacting Josephson π-rings.
3
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Critical Currents, Magnetization and Microwave Absorption of (Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.8}Gd_{0.2})Cu_2O_{z} Superconductor

80%
Woch W., Niewolski J., Tokarz W., Kołodziejczyk A., Sudra H., Gritzner G.
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issue 2
319-322
EN
The bulk (Tl_{0.5}Pb_{0.5})Sr_2(Ca_{1 - x}Gd_{x})Cu_2O_{z} superconductors with x = 0.1, 0.2 and 0.3 have unique and very interesting magnetic and electrical properties. In this paper we focused our attention on the superconductor with gadolinium content x = 0.2. We measured the magnetic field dependences of the transport critical currents, the microwave absorption as well as the magnetization for different temperatures. The critical temperature of this sample is T_c = 105.3 ± 0.2 K and the transition width Δ T_{90% - 10%} = 3.6 ± 0.2 K. The critical current of this superconductor is J_c = 1 820 ± 10 A/cm^2 at 77 K. The data were analyzed within the frame of the Bean and Kim models as well as the percolation model.
4
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Josephson Junctions Like Behavior in Superconducting Nb Films with Diluted Triangular Arrays of Antidots

80%
Mumtaz M., He S., Qiu X., Kamran M.
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EN
We present current versus voltage (I-V) measurement on superconducting Nb films with diluted triangular arrays (honeycomb and kagome) of antidots. Peaks and dips appearing in the derivative (dV/dI) of I-V curves showing the variation in the resistance is the indication of Josephson Junctions like weak-links in these systems. These observations also reveal the presence of mobile interstitial vortices in these lattices with regular pinning arrays. This behavior is predominant in honeycomb arrays due to large density of interstitial spaces in this system as compared that of to kagome lattice. This behavior can be tuned by temperature as well as external magnetic field but the tuning values of these parameters can be different for different symmetries of antidots.
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