By A. B. Pippard (auth.), Brian B. Schwartz, Simon Foner (eds.)
This publication contains small and massive scale functions of large conductivity. half I, SQUIDs, contains approximately seventy five% of this quantity, and is dedicated to small scale purposes, typically .§uperconducting QUantum Interference units (SQUIDs), and the remaining, half H, Machines, offers an up to date evaluate of huge scale purposes of superconduc tivity. the current ebook mixed with the former ebook Superconducting Machines and units: huge structures purposes edited by way of S. Foner and B. B. Schwartz, Plenum Press, long island (1974) represents an in depth and latest overview of the functions of superconducting tech nology. The textual content of the present publication is appropriate for complex undergrad uates or graduate scholars in utilized physics and engineering classes. The booklet could be necessary to scientists, engineers and technologists attracted to the present prestige and destiny purposes of superconduc tivity expertise. The final 7 chapters partially I assessment the most important kingdom al efforts on small scale know-how and will turn out beneficial for commercial and govt planners as weIl as scientists and engineers.
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Additional info for Superconductor Applications: SQUIDs and Machines
2e a B 0 (29) hol The total current through the double junction is equal to the sum of the currents through the individual contacts and is a function of Band I::. i can be maximized with respect to I::. yields the critical current of the device, ic(B} = [(ia - iJ2 + 4 Vb C082 ( li B 0) ] L 1/2 (30) ~* a and (31) When ia = i b = i 1 Eq. (31) reduces to the well-known interference relation, 1c (BL ) = 2'1 Icos li B 01 L (32) This relationship is presented in Fig. 8 for a double point contact with identical junction parameters i 1 = ig .
Read it again. and remember that the paper is the result of systematic pressure on my part and Phil Anderson's to get the ideas into an intelligible form. I still find it a very difficult paper. but the first vers ions were really in a class of their own. since he was a new research student with almost no experience of technical writingoI hope you will be sympathetic to my reaction. which was to tell hirn that I just didn't have a clue what he was talking about. and he had better go and talk to Phil Anderson.
To lowest order we ~ 51 (1) Fig. e '""51 i CP1 ~ -vp;e 52 52 irJ: 2 (2) L - -_ _ _ _ _...... A schematic diagram of a single junction. 27 MACROSCOPIC QUANTUM PHENOMENA IN SUPERCONDUCTORS can ignore the corrections. If the link Is very weak we suppose the supercurrent in the link is proportional to a function of the phase difference, (16) Bq. (5) is useful for a long wire, in which the phase JIl(x) can be followed as a continuous variable of x along the wire. 1t is not satisfactory for a localized weak link in which only the total phase difference I:::,JIl can be defined up to differences of 2rr n.