By Y. Bruynseraede, C. Vlekken, C. Van Haesendonck (auth.), Harold Weinstock, Richard W. Ralston (eds.)

ISBN-10: 9401048487

ISBN-13: 9789401048484

ISBN-10: 940111918X

ISBN-13: 9789401119184

This quantity is predicated at the court cases of the NATO-sponsored complicated experiences Institute (ASn at the New Superconducting Electronics (held 9-20 August 1992 in Waterville Valley, New Hampshire USA). The contents herein are meant to supply an replace to an previous quantity at the similar topic (based on a NATO ASI held in 1988). 4 years turns out a comparatively little while period, and our identify itself, that includes the recent Superconducting Electronics, might sound a bit of pretentious. however, we consider strongly that the ASI fostered a well timed reexamination of the technical development and alertness capability of this rapid-paced box. There are, certainly, many new avenues for technological innovation that have been no longer estimated or thought of attainable 4 years in the past. the best advances via some distance have happened in regards to oxide superconductors, the so-called excessive­ transition-temperature superconductors, identified in brief as HTS. those advances are as a rule within the skill to manufacture either (1) top quality, quite large-area motion pictures for microwave filters and (2) multilayer gadget constructions, largely superconducting-normal-superconducting (SNS) Josephson junctions, for superconducting-quantum-interference-device (SQUID) magnetometers. also, we've seen the discovery and improvement of the flux-flow transistor, a planar three-terminal gadget. throughout the previous ASI in basic terms the first actual HTS movies with enough critical-current density had simply been fabricated, and those have been of restricted zone and had excessive resistance for microwave current.

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99. 47 H = Hd, the recovery of the normal state in a magnetic field occurs through a secondorder phase transition. For lower temperatures T < Td, an abrupt appearence of the resistive state is observed, clearly indicating a first-order phase transition. The strong suppression of the phase boundary for the LP oscillations by a transport current I > 1 p,A may be qualitatively interpreted in the following way, if one assumes that the theoretical calculations of the field penetration into a long hollow cylinder [19, 20] (Eqs.

It is clear that the modification of the flux period is caused by a renormalization of the effective area Seff = 'If R1R2 = ('If RD(1 + d/ R 1 ) for flux penetration and not by a renormalization of the flux quantum 1>0. For p. < 1 the superconducting state disappears gradually via a second-order phase transition at 1> == 'If R~ Her = 1>cr. For a given n, the critical value 1>cr is given by the root of the equation [19]: Figure 4. : (a) p. 2, (b) P. 2, (c) P. 6 (from ref. [19]). 38 e(T) (1+d/2Rt) (4)(l+d/Rt) _n)2 _1_J2e(T) 1 (4)(1+d/Rl))2 R~ 4>0 3Rt 1 + d/R 1 4>0 (20) The parabolas shown in Fig.

L(a)). In mesoscopic superconducting loops, placed in a perpendicular external field, the shielding current is mixed with the transport current and one might expect a pronounced current dependence of the LP effect in the loop geometry. It will be shown that in this case the phase boundary in the H - T plane has an unusual current and field dependence for low flux quanta, which is accompanied by anomalous LP oscillations [25, 26]. The amplitude of the observed Te( H) oscillations is strongly influenced by the transport current through the loop, and a cross-over to a non-oscillatory phase boundary is found for higher transport currents, accompanied by a change of the order of the phase transition.

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The New Superconducting Electronics by Y. Bruynseraede, C. Vlekken, C. Van Haesendonck (auth.), Harold Weinstock, Richard W. Ralston (eds.)

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