ABSTRACT
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We discuss the origin of supercoolability in metallic and halide melts. While the level of supercooling in metals is closely connected with the structural incompatibilities between the molten state and the product crystal, respectively,... more
We discuss the origin of supercoolability in metallic and halide melts. While the level of supercooling in metals is closely connected with the structural incompatibilities between the molten state and the product crystal, respectively, the supercoolability of halide melts is caused by their strong complex-forming nature. The effect of initial overheating and its duration on the supercooling reached in a melt of PbBr 2 is reported.
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The electrical resistance of the supercooled PbBr 2 melt has been studied. A theoretical model describing the temporal changes of resistance and taking into account the strong complex-forming nature of halide melts has been elaborated.... more
The electrical resistance of the supercooled PbBr 2 melt has been studied. A theoretical model describing the temporal changes of resistance and taking into account the strong complex-forming nature of halide melts has been elaborated. Results of theoretical calculations are compared with experimental data. Good agreement of the theory and the experiment allows one to conclude that measurement of resistance may be useful to follow the solidification of halide melts.
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ABSTRACT
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We calculate the magnetic penetration length lambda(T) of a disordered granular superconductor with pi junctions in zero magnetic field, using a mean-field replica method. The superconductor is modeled by an array of Josephson junctions... more
We calculate the magnetic penetration length lambda(T) of a disordered granular superconductor with pi junctions in zero magnetic field, using a mean-field replica method. The superconductor is modeled by an array of Josephson junctions whose couplings are drawn randomly from a Gaussian distribution centered at J0>0, with width J. For disorder strength delta≡J/J0=1 there are only two phases: (i) the
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We present an approximate analytical solution of the kinetic equation describing the formation of droplets of the real nuclei (fragments) within metastable nucleonic gas produced by intermediate-energy, heavy-ion collisions. It is found... more
We present an approximate analytical solution of the kinetic equation describing the formation of droplets of the real nuclei (fragments) within metastable nucleonic gas produced by intermediate-energy, heavy-ion collisions. It is found that for a finite-range, Brink - Boeker effective interaction the production of large supercritical fragments is highly improbable above a certain temperature because this process requires times comparable to the lifetime of the fireball. Critical droplet size and the difference in chemical potentials of nucleonic vapour and the fragments are determined from the kinetic Fokker - Planck equation. On the other hand, the repulsive Coulomb force might cause a conversion via spinodal decomposition in small systems.
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ABSTRACT
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ABSTRACT