611 research outputs found
Networks of Josephson junctions and their synchronization
One can demonstrate that a 1-D Josephson network containing junctions with
different resistances can be synchronized at frequencies, which are multiples
of 2eV, where V is the total d.c. voltage applied across the network. The
appearance of such synchronization follows from the law of charge conservation
and takes place if charge transfer is dominated by the Josephson channel. One
can observe also a sub-harmonic structure. The result holds for cluster-based
arrays as well as for general case of a tunneling network.Comment: 13 page
Generalized Poisson integral and sharp estimates for harmonic and biharmonic functions in the half-space
A representation for the sharp coefficient in a pointwise estimate for the
gradient of a generalized Poisson integral of a function on is obtained under the assumption that belongs to . It is
assumed that the kernel of the integral depends on the parameters and
. The explicit formulas for the sharp coefficients are found for the
cases , and for some values of in the case
. Conditions ensuring the validity of some analogues of the
Khavinson's conjecture for the generalized Poisson integral are obtained. The
sharp estimates are applied to harmonic and biharmonic functions in the
half-space.Comment: 24 pages. arXiv admin note: text overlap with arXiv:1703.0633
Intercalation and High Temperature Superconductivity of Fullerides
Intercalation of polyatomic molecules into a superconductor can drastically
affect the properties of the compound. A mechanism leading to a large increase
in Tc for such systems is proposed. It explains the recent remarkable
observation of high Tc superconductivity in the hole-doped C60/CHX3 (X=Cl,Br)
compounds and the large shift in their Tc upon Cl->Br substitution. The
increase in Tc is due to contribution to the pairing arising from the
interaction of electrons with the vibrational manifold of the molecule. The
proposed mechanism opens up the possibility to observe a site-selective isotope
effect. We also suggest that intercalating CHI3 would further increase the
critical temperature to Tc=140K.Comment: Final expanded version of cond-mat/0109553 and cond-mat/0110327 with
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