| viXra.org > Condensed Matter > 2310 |
 |
 |
| viXra.org > Condensed Matter > 2310 |
|
|
[5] viXra:2310.0103 [pdf] submitted on 2023-10-21 06:07:36
Authors: Stanislav Dolgopolov
Comments: 2 Pages.
Here we propose an experiment showing that a persistent supercurrent decays when its electron pairs break and recombine, i.e. when paired electrons are interchangeable with normal (single) electrons. We produce a small non-superconducting area in a massive superconducting (SC) aluminum. Electron pairs break and recombine in the non-SC area, so newly created pairs can drift from the non-SC area into SC area and replace initial electron pairs, which flow in a persistent supercurrent in the SC area. The drift and, thus, the replacement rate are directly related to the size of contact area between SC and non-SC zones, so the supercurrent lifetime is inversely related to the size of the contact area. Thus we show that the supercurrent vanishes because its electron pairs experience creation/annihilation and are not permanent.
Category: Condensed Matter
[4] viXra:2310.0102 [pdf] submitted on 2023-10-22 00:09:25
Authors: Ricardo Gobato, Lauro Figueroa Valverde, Sana Ahmed, Sufia Zaman, Ibtihal Kadhim Kareem Dosh, Marcela Rosas Nexticapa, María Magdalena Álvarez Ramírez, Abhijit Mitra
Comments: 6 Pages.
This study applies Density Functional Theory(DFT), using the B3LYP functional, and via ab initio Restrict Hartree-Fock (RHF) methods, to study the infrared spectrum of steroid 17-Iodo-androst-16-ene. The spectrum was obtained viacomputational methods ab initio RHF and DFT. Optimization of molecular structure via UFF (Universal Force Field), followed by PM3 (Parametric Method 3), with geometric optimization,obtaining the spectrum of other basis sets of steroid 17-Iodo-androst-16-ene. The study this steroid was chosen because it can could act as aromatase enzyme inhibitors and this phenomenon could be translated as good compounds to treat breast cancer. The B3LYP functional always presents the lowest thermal energy than the RHF in all calculated bases, however the RHF always presents the highest Entropy than the B3LYP, in all the calculated basis sets. The normalized spectrum calculated in the B3LYP/SVP functional/basis set have harmonic frequency with peaks 3,241.83 cm−1, 100% and 3,177.535 cm−1 at 43.304% absorbance. The study has so far been limited to computational methods compatible with the theory of quantum chemistry.
Category: Condensed Matter
[3] viXra:2310.0099 [pdf] replaced on 2024-06-11 20:10:40
Authors: Xiuqing Huang
Comments: 18 Pages.
Based on experimental evidence from scanning tunneling microscopy and spectroscopy, angle-resolved photoemission spectroscopy, and neutronscattering in high-temperature uperconductors,we present a unified theoretical framework that the confined electrons within polyhedral quantum wells as the Mott ground state and the symmetry-breaking of electron-proton pair as the superconducting mechanism. The new theory enables the analytical determination of fundamental properties in copper- andiron-based superconductors. These properties include the magic doping and checkerboard charge order, Fermi surface structure and its splitting, the symmetry and value of the superconducting energy gap, the superconductingtransition temperature, and the spin resonance peaks and their parity. The theoretical predictions of our model show strong agreement with experimental findings. Moreover, our research offers novel insights into the microscopic nature of magnetism, spin, holes, localized Cooper pair, magnetic monopoles, the Ginzburg-Landau order parameter, and the Meissner effect.
Category: Condensed Matter
[2] viXra:2310.0037 [pdf] submitted on 2023-10-08 22:27:45
Authors: Wanpeng Tan
Comments: 21 Pages. more papers at https://www.wanpengtan.com/smm/
A novel chiral electron-hole (CEH) pairing mechanism is proposed to account for non-BCS superconductivity. In contrast to BCS Cooper pairs, CEH pairs exhibit a pronounced affinity to antiferromagnetism for superconductivity. The gap equations derived from this new microscopic mechanism are analyzed for both s- and d-wave superconductivity, revealing marked departures from the BCS theory. Unsurprisingly, CEH naturally describes superconductivity in strongly-correlated systems, necessitating an exceedingly large coupling parameter ($lambda>1$ for s-wave and $lambda>pi/2$ for d-wave) to be efficacious. The new mechanism provides a better understanding of various non-BCS features, especially in cuprate and iron-based superconductors. In particular, CEH, through quantitative comparison with experimental data, shows promise in solving long-standing puzzles such as the unexpectedly large gap-to-critical-temperature ratio $Delta_0/T_c$, the lack of gap closure at $T_c$, superconducting phase diagrams, and a non-zero heat-capacity-to-temperature ratio $C/T$ at $T=0$ (i.e., the ``anomalous linear term''), along with its quadratic behavior near $T=0$ for d-wave cuprates.
Category: Condensed Matter
[1] viXra:2310.0018 [pdf] submitted on 2023-10-04 11:42:36
Authors: Victor L. Mironov, Sergey V. Mironov
Comments: 10 Pages.
We present a description of plane Poiseuille flow of non-Newtonian time-independent fluid based on symmetric equations, which take into account both the longitudinal motion and rotation of the vortex tubes. This model has analytical solution in the form of the two-parametric velocity distribution, which is in good agreement with velocimetry data in microchannels. The advantage of this approach is that, in contrast to the Ostwald-de Waele power law, it provides a more accurate approximation of experimental velocity profiles for different Reynolds numbers by model profiles corresponding to the same viscosity parameter. We believe that this simple model can be useful for making adequate estimates for the parameters of non-Newtonian time-independent fluids in engineering hydrodynamics.
Category: Condensed Matter
| Third-Party Links: |
|