Condensed Matter

2210 Submissions

[6] viXra:2210.0128 [pdf] submitted on 2022-10-26 12:05:08

Electronic Structure and Magnetic Properties of Cr-doped ZnO

Authors: Nedya Farisia, Rosari Saleh
Comments: 11 Pages.

Within the framework of Density Functional Theory (DFT) we have studied the electronic and the magnetic properties of wurtzite ZnO doped with transition-metal Cr in the presence of some defects (Vo, H, VoH). The spectrum of band structure, density of states (DOS) and projected density of states (PDOS), and spin-density distribution in this system were investigated. The results of investigation shows that the existence of Vo in ZnO:Cr could stabilize ferromagnetic state of the system, due to the large magnetization and density of states at Fermi level. While, the existence of H introduce donor in ZnO:Cr but just polarized above Fermi level so there is no much change observed in its magnetic properties. And as for the existence of VoH in ZnO:Cr, it turn out able to show the half-metallic properties.
Category: Condensed Matter

[5] viXra:2210.0097 [pdf] submitted on 2022-10-20 07:34:45

Modified Cattaneo-Vernotte Equation for Heat Transfer in Solids

Authors: Victor L. Mironov
Comments: 11 Pages.

We propose a modified Cattaneo-Vernotte relation between heat flux and temperature gradient, which leads to a second-order equation describing the evolution of temperature in solids with finite rate of propagation. A comparison of the temperature field spreading in the framework of Fourier, Cattaneo-Vernotte (CV) and modified Cattaneo-Vernotte (MCV) equations is discussed. The comparative analysis of MCV and Fourier solutions is carried out on the example of simple problem of plate cooling.
Category: Condensed Matter

[4] viXra:2210.0060 [pdf] submitted on 2022-10-15 01:48:04

Bose-Einstein Condensate a With a Defocusing Nonlinearity in the Potential X^2 + Mx^3

Authors: X. N. Ismatullaev
Comments: 2 Pages.

Eigenfrequencies are found for oscillations of the width and center of mass of the Bose Einstein condensate in an anharmonic potential.
Category: Condensed Matter

[3] viXra:2210.0059 [pdf] submitted on 2022-10-15 01:50:25

Bose-Einstein Condensate With Repulsive Interatomic Interaction in an Anharmonic Trap X^4

Authors: X. N. Ismatullaev
Comments: 2 Pages.

An ansatz for the Bose-Einstein condensate in an external potential of the form x 4 is proposed . The ansatz was chosen by numerical comparison of the stationary wave packet with different ansatz.
Category: Condensed Matter

[2] viXra:2210.0052 [pdf] submitted on 2022-10-14 01:41:42

Dynamics of a Dissipative Bose Einstein Condensate in the External Parabolic Potential

Authors: K. H. Ismatullaev
Comments: 2 Pages.

Using the variational approximation, it is shown that in a dissipative condensate, the width fluctuations and the motion of the center of mass are related in the case of an external parabolic potential.
Category: Condensed Matter

[1] viXra:2210.0015 [pdf] submitted on 2022-10-04 00:52:52

The Radiation of RLC Circuit with the Longitudinal Capacitor

Authors: Miroslav Pardy
Comments: 7 Pages. Orignal Article

The RLC circuit is generalized in such a way that the capacitor has longitudinal form and the components are all in series with the voltage source . The medium in capacitor is dielectric with the index of refraction n. The change of the amount of charges on the left and right sideof the capacitor generate in medium special radiation which is not the Cerenkov radiation, no the Ginzburg transition radiation but the originalradiation which must be confirmed in laboratories.We have calculated the spectral form of the radiation. It depends on the dielectric constant n of the capacitor medium. The defect in medium is involved in the spectral form and can be compared with the original medium. Such comparison is the analog of the Heyrovsky-Ilkovic procedure in the electro-chemistry (Heyrovsky et al., 1965).
Category: Condensed Matter