Download Current-Induced Nonequilibrium Phenomena in by Reinhard Tidecks PDF

By Reinhard Tidecks

Ranging from the early experiments, this designated presentation, containing greater than 500 references, offers a complete evaluation on current-induced nonequilibrium phenomena in quasi-one-dimensional superconductors, top the reader from the basics to the newest learn effects. Experiments on monocrystalline filaments (whiskers) - together with these received via the writer - are in comparison with effects on lengthy skinny movie microbridges and comparable species and interpreted in the theoretical framework. directions on experimental suggestions are given and but unresolved difficulties are mentioned. The publication is easily appropriate as an advent for the amateur and as a guide for the lively researcher.

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Extra resources for Current-Induced Nonequilibrium Phenomena in Quasi-One-Dimensional Superconductors

Example text

At the critical c u r r e n t density, Jc, it is v s equal to the critical velocity [2], v = h / 2 m l / - 3 ~(T). 8S3~0'/a~/2(T:0/(To0-T)) ~/2. (7) and [2,81,87J ZGL= ~ h / 8 k ( T o 0 - T ) it f o l l o w s F= 1 / 2 z E+ 1/6z6L so t h a t at the critical c u r r e n t density zc~in,j c = ( 4 k T o o / n h ) z~ (I+zE/3ZGL) -~/2 For 1/2Za<

Since the calculated values for zEoo are much too large, these values have been determined from experiments. It t u r n s out t h a t evidence for the predicted behaviour can be obtained from several m e a s u r e m e n t s . Nevertheless, the situation is unclear, because o t h e r experiments seem to contradict the prediction. The inelastic e l e c t r o n - p h o n o n collision time, ~E, has been discussed s o m e w h a t in detail in this section because it is a very i m p o r t a n t parameter for the p r o b l e m of charge imbalance relaxation: It appears in the expression for zQ.

The second term is the p r o d u c t of the probability that the pair state be filled and the probability that the quasiparticle state - K be empty, t h a t means the 27 probability that the _K state is not held empty by a quasiparticle excitation at - K . (30) yields 2 N/C} = (2/s 2 Z [V~+(UK -V~) fK_] (32) In equilibrium Z ( uK2 - VK2) fK = O, because UK2 -- VK2= ~K/l~K iS odd in ~K, whereas fK(EK) is e v e n - i n eK. (27), and also for T>O the chemical potential of the condensate is equal to gF.

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