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Advances in Superconductivity by H. Fröhlich (auth.), B. Deaver, John Ruvalds (eds.)

By H. Fröhlich (auth.), B. Deaver, John Ruvalds (eds.)

The complex examine Institute on "Advances in Superconductivity" was once held on the Ettore Majorana Centre for medical tradition in Erice, Sicily, in the course of July three to July 15, 1982. This Institute used to be the 3rd process the foreign institution of Low Tempera­ ture Physics, which was once validated on the Centre in 1977 with the information and notion of T. Regge and A. Zichichi. The 1982 direction was once established on an issue which introduced jointly primary easy learn and the newest promising technological purposes. therefore, the individuals represented a large spectrum of commercial and govt laboratories, in addition to universities from a variety of nations. this system of themes and audio system used to be constructed with the recommendation of the Organizing Committee, composed of H. Frohlich, T. Regge, B. Stritzker, and L. Testardi. This Institute emphasised fresh advancements within the technology and know-how of superconductivity. A historic viewpoint used to be supplied by means of H. Frohlich, whose lectures keep in mind the earliest discoveries and theoretical makes an attempt to appreciate superconductivity. paradoxically, his early advice of the electron-phonon coupling as a key to superconductivity was once met with preliminary frequent skepticism. Later, the improvement of box thought tools for stable kingdom physics difficulties, and the evolution of the BCS conception has resulted in a doubtless unanimous concensus in regards to the e1ectron­ phonon mechanism because the principal resource of superconductivity in identified fabrics. Experimental reports of superconductivity exemplify the powerful interaction of technology and expertise in lots of ways.

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When the flux, ~, threading the SQUID loop is changed, the critical current and hence the I-V characteristic oscillate with period ~o' as indicated in Fig. l2(b). If the SQUID is biased with a current greater than the maximum critical current, the voltage across the SQUID is periodic in the flux, as shown in Fig. l2(c). Thus, the SQUID is simply a flux-to-voltage transducer, with a transfer function V~ = (dV/d~)I that is a maximum near (2n + 1)~0/4. In most applications, at least for low frequency measurements, the SQUID is operated in a flux-locked loop.

35:812. Ketchen, M. , and Tsui, C. , 1980, Low frequency noise in smallarea tunnel junction dc SQUIDs, in: "SQUID '80, Superconducting Quantum Interference Devices and their Applications," H. D. Hahlbohm and H. 227. FUNDAMENTAL LIMITS ON SQUID TECHNOLOGY 49 Ketchen, M. , and Jaycox, J. , 1982, Ultra-low-noise tunnel junction dc SQUID with a tightly coupled planar input coil, ~. Phys. , 40:736. Koch, R. , 1981, (unpublished). Koch, R. D. thesis, University of California, Berkeley (unpublished).

1:251. Ketchen, M. , 1981, DC SQUIDs 1980: The state of the art, IEEE Trans. , MAG-17:387. Ketchen, M. , and Voss, R. , 1979, An ultra-low noise tunnel junction dc SQUID, Appl. Phys. , 35:812. Ketchen, M. , and Tsui, C. , 1980, Low frequency noise in smallarea tunnel junction dc SQUIDs, in: "SQUID '80, Superconducting Quantum Interference Devices and their Applications," H. D. Hahlbohm and H. 227. FUNDAMENTAL LIMITS ON SQUID TECHNOLOGY 49 Ketchen, M. , and Jaycox, J. , 1982, Ultra-low-noise tunnel junction dc SQUID with a tightly coupled planar input coil, ~.

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