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A model for describing the spin subsystem of cuprates within a model of polar singlet-triplet Jahn-Teller centers is proposed. In this model spin ordering is described by two vector order parameters S (the total spin of a CuO 4 cluster) and V (the operator of the change in spin multiplicity per...
A study of the changes in the structure of melt-quenched Fe 90 Zr 10 amorphous alloys by x-ray diffraction, Auger spectroscopy, and transmission electron microscopy is reported. The samples were subjected to isochronous (for 1 h) and isothermal anneals at 100–650 °C. It is shown that an...
The mixed state of thin narrow superconducting films with an edge barrier placed in a transverse magnetic field is considered. The boundaries of the region for the existence of metastable mixed states with an assigned number of vortices N ( H min ( N )⩽ H ⩽ H max ( N )) are found. The...
The anisotropy of a system of barium ferrite particles with an average diameter of 60 nm has been studied. The effective anisotropy constant has been determined in the temperature range from 4.2 K to T c by the law governing approach to saturation magnetization. The observed deviation from the...
The influence of the nature of the interaction of deformation and impurity defects on the scattering of majority carriers is investigated in silicon single crystals.
The dc electrical resistivity and magnetoresistivity of polycrystalline manganites La 1− x Ca x MnO 3 ( x =0–0.3) are investigated as functions of the temperature, magnetic field and electric field, along with the microwave surface resistance. The investigations show that the dc electrical...
A phenomenological model is developed for the giant magnetoresistance of granular media comprising ferromagnetic granules in a nonmagnetic metal matrix. Both volume and surface spin-dependent scattering by the ferromagnetic granules are taken into account. The internal electric fields are...
The linear thermal expansion coefficient of crystal lattices of germanium with different isotopic compositions is analyzed.
The parameters of the Colle-Colle-type distribution function for the time constant of Pb(Zr 0.52 Ti 0.48 )O 3 thin-film layers and the pattern of the bulk resistivity distribution through the film thickness have been derived from measured frequency dependences of the complex capacitance of...
The change in the 64 Cu electron-capture constant for the compounds Cu 2 O, YBa 2 Cu 3 O 7 , YBa 2 Cu 3 O 6 , Nd 2 CuO 4 , Nd 1.8 Ce 0.2 CuO 4 , La 2 CuO 4 , La 1.7 Sr 0.3 CuO 4 , Tl 2 Ba 2 CaCu 2 O 8 , and Bi 2 Sr 2 CaCu 2 O 8 has been measured. It is concluded that the copper in YBa 2 Cu 3 O 7...
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