Superconducting coherence length

The criterium that the mean free path should be larger than the superconducting coherence length must be met. This is a very strict condition that implies also that the impurity interband scattering rate yab should be very small yah (1/2 )(KB/ft)Tc. Therefore most of the metals are in the dirty limit where the interband impurity scattering mixes the electron wave functions of electrons on different spots on bare Fermi surfaces and it reduces the system to an effective single Fermi surface. 

In order to identify the Feshbach shape resonance we have plotted in Fig. 14 the ratio Tc/TF(exp) for the aluminum doped case where TF is the Fermi temperature TF=eF/KB and eF=EA-EF is the Fermi energy of the holes in the a band, and Tc is the measured critical temperature. The TC/TF ratio is a measure of the pairing strength (kF o)1 where kF is the Fermi wavevector and is the superconducting coherence length. In fact in the single band BCS theory this ratio is given by TC/TF = 0.36/ , ,. ... 

NB, the correlation length discussed here is not the superconducting coherence length, which is often identified by the same symbol. 

Magnetization measurements on the bulk powders of K3C60 allowed the determination of additional parameters of the superconducting state. Upper and lower critical fields were analyzed to determine a penetration depth of A = 2400 A, and a superconducting coherence length of =... 

We have measured the temperature dependence of the lower and upper critical fields in superconducting KjCso. From the measurements, we have evaluated the jwnetration depth (X 2400 A) and superconducting coherence length ( 26 A). The parameters are in agreement with a superconducting state formed by a narrow band. 

The first step towards the fabrication of thin-film devices is the growth of a single-layer film. The anisotropic layered structure and short superconducting coherence lengths of most high Tc superconductors introduce aspects of film growth that need not to be considered for conventional low-temperature superconductors. 

T-n antiferromagnetic ordering (Neel) superconducting coherence length... 

Bohr magneton unit of dipole moment 9.2741 xlO joule/tesla real space magnetic correlation length or superconducting coherence length... 

Onuki et al. (1987) have reported that the superconducting upper-critical field H (0) of polycrystalline URu2Si2 decreases at a rate of —8.4kOe/kbar (fig. 43c). For BCS superconductors, is related to the superconducting coherence length by... 

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