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A.?V.?Zaitsev G.?A.?Ovsyannikov K.?Y.?Constantinian Yu.?V.?Kislinski? A.?V.?Shadrin I.?V.?Borisenko P.?V.?Komissinskiy 《Journal of Experimental and Theoretical Physics》2010,110(2):336-344
It is shown experimentally that the superconducting current density in Nb/Au/Ca1 − x
Sr
x
CuO2/YBa2Cu3O7 − δ hybrid superconducting heterostructures with a Ca1 − x
Sr
x
CuO2 anti-ferromagnetic (AF) cuprate interlayer is anomalously high for interlayer thicknesses d
M
= 10–50 nm and the characteristic damping length for superconducting correlations is on the order of 10 nm. The experimental
results are explained on the basis of theoretical analysis of a junction of two superconductors (S′ and S) connected by a
magnetic multilayer with the AF ordering of magnetization in the layers. It is shown that with such a magnetization ordering,
anomalous proximity effect determined by the singlet component of the condensate wavefunction may take place. As a result,
the critical currents in S′/I/AF/S and S′/I/N/S structures (I denotes an insulator, and N, the normal metal) may coincide
in order of magnitude even when the thickness of the AF interlayer considerably exceeds the decay length of the condensate
wavefunction in ferromagnetic layers. 相似文献
54.
Geck J von Zimmermann M Berger H Borisenko SV Eschrig H Koepernik K Knupfer M Büchner B 《Physical review letters》2006,97(10):106403
We present a combined high-energy x-ray diffraction and local-density approximation study of the sodium ordering in Na(0.75)CoO2. The obtained results rule out previously proposed Na-ordering models and provide strong evidence for the formation of sodium-density stripes in this material. The local-density approximation calculations prove that the sodium-density stripes lead to a sizable dip in the density of the Co states at the Fermi level, pointing to band structure effects as a driving force for the stripe formation. This indicates that the sodium ordering is connected to stripelike charge correlations within the CoO2 layers, leading to an astonishing similarity between the doped cuprates and the NaxCoO2 compounds. 相似文献
55.
In the Euclidean Space
\mathbb Rn+1{\mathbb {R}^{n+1}} with a density
ee\frac12 n m2 |x|2, (e = ±1){e^{\varepsilon \frac12 n \mu^2 |x|^2},} {(\varepsilon =\pm1}), we consider the flow of a hypersurface driven by its mean curvature associated to this density. We give a detailed account
of the evolution of a convex hypersurface under this flow. In particular, when e = -1{ \varepsilon=-1} (Gaussian density), the hypersurface can expand to infinity or contract to a convex hypersurface (not necessarily a sphere)
depending on the relation between the bound of its principal curvatures and μ. 相似文献
56.
Evtushinsky DV Kordyuk AA Zabolotnyy VB Inosov DS Büchner B Berger H Patthey L Follath R Borisenko SV 《Physical review letters》2008,100(23):236402
We present a calculation of the Hall coefficient in 2H-TaSe(2) and 2H-Cu(0.2)NbS(2) based on their electronic structure extracted from angle-resolved photoemission spectra. The well-known semiclassical approach, based on the solution of the Boltzmann equation, yields the correct value for the normal-state Hall coefficient. Entering the charge density wave state results in the opening of the pseudogap and redistribution of the spectral weight. Accounting for this allows us to reproduce the temperature dependence of the Hall coefficient, including the prominent sign change, with no adjustable parameters. 相似文献
57.
The transitional processes in heterocontacts based on strongly correlated electron systems (SCES) are studied for analyzing of the effect of resistive switching (ERS). It has been shown that the process is asymmetric with respect to switching into “on” and “off” states, the switching time is controlled by a voltage level, this time can be less than microseconds, on the other hand, relaxation processes can reach tens seconds. The switching is controlled by two processes: a change in the resistance state of the normal metal/SCES interface under effect of electric current field and by electrodiffusion of oxygen to vacancies, at that the doping level of the contact area and resistive properties of the heterocontact change. In particular, electrodiffusion of mobile oxygen induced by the electric field makes it possible to use a device with ERS as a memristor. On the other hand, a possibility to control the switching time and ON and OFF parameters show the possibilities to use these devices as memory elements “RAM”. 相似文献
58.
Normanskaja Yu. V. Borisenko O. D. Beloborodov I. B. Avetisyan A. I. 《Doklady Mathematics》2022,105(3):187-206
Doklady Mathematics - The LingvoDoc system ( http://lingvodoc.ispras.ru ) provides a service for collaborative language documentation and computations on the collected data. This software system... 相似文献
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