| viXra.org > Condensed Matter > 2303 |
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| viXra.org > Condensed Matter > 2303 |
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[4] viXra:2303.0157 [pdf] submitted on 2023-03-28 00:45:50
Authors: Reginald B. Little
Comments: 17 Pages. The author realized the uniqueness of hydrogen as pressure dependent nonmetal and metal properties, so he revised the predicted isotope effect of 14N and 15N from his prior submission viXra:2303.0135 on March 21, 2023.
The author has previously noted the effects of stable isotopes having different nuclear magnetic moments on chemistry, catalysis, biochemistry, thermodynamics, optics, superconductivity and more [1]. In this controversy surrounding reported room temperature superconductivity at near ambient pressures by nitrogen doped lutetium hydride, the author hopes to convince and reason that the different synthesis conditions of the original work of Dias and coworkers [2] at low temperature, mild pressures, diamond anvil cell compression and prolong annealing may lead to selective doping of the lutetium hydride by 14N. The later attempted replication of Dias and coworkers by Hai-hu Wen and coworkers [3] may have caused different outcomes as Hai-hu Wen and coworkers appeared to try Dias work and then switched to a different synthetic method whereby Wen and coworkers instead applied high pressures and high temperatures to the reacting hydrogen, nitrogen and lutetium to produce a nitrogen doped lutetium hydride with similar lattice structure as the originally reported by Dias and coworkers [2] but lacking observed superconductivity and evidence of superconductivity by diamagnetism. The author here by his theory notes the possibility that the different later high pressure, high temperature synthesis by Wen and coworkers doped their sample with 15N rather than 14N as originally enriched in Dias’s sample. Thereby the author notes by his theory [1] that whereas 14N doped lutetium hydride manifests higher superconductivity due to its positive nuclear magnetic moment (NMM), the 15N doped lutetium hydride of Wen and coworker should not manifest superconductivity at the higher temperatures due to its positive NMM. Thereby the authors’ theory gives account of both Dias’ and Wen’s experiments.
Category: Condensed Matter
[3] viXra:2303.0156 [pdf] replaced on 2024-06-21 06:09:27
Authors: Yuanjie Huang
Comments: 41 Pages.
In metal physics, the free-electron model and the related Fermi-Dirac distribution were usually utilized to investigate multi-physical properties of metals. However, they neglected the important mechanical-electric coupling (MEC), and therefore some longstanding physical problems such as the positive Seebeck coefficients of some monovalent metals and the physical origin of charge density wave (CDW) gap may be difficult to solve. In the work, the MEC in metals was investigated. The MEC may lead to a single-electron model which can offer a simple way of interpreting the electron heat capacity, the Pauli magnetic susceptibility, the electrical conductivity and the electron thermal conductivity of the metals. It may also indicate that the heavy-fermion characteristics of the heavy-fermion systems may originate from the physical picture that the electron chemical potential intersects the narrow conduction f-electron band and the correlation effects among heavy-fermions may be weak, as is in contrary to the conventional viewpoint. Furthermore, it was found that the MEC can not only give the right sign of Seebeck coefficients of the monovalent metals but also give the physical origin of the CDW gap, which are in agreement with experimental results. Overall, the MEC may be important for the metals and it should be taken into account seriously for investigating the multi-physical properties of the metals.
Category: Condensed Matter
[2] viXra:2303.0135 [pdf] submitted on 2023-03-21 02:43:28
Authors: Reginald V. Little
Comments: 3 Pages. This manuscript is important to the community as it may give reasons for difficult replication of Dias and coworkers.
The author has previously noted the effects of stable isotopes having different nuclear magnetic moments on chemistry, catalysis, biochemistry, thermodynamics, optics, superconductivity and more [1]. In this controversy surrounding reported room temperature superconductivity at near ambient pressures by nitrogen doped lutetium hydride, the author hopes to convince and reason that the different synthesis conditions of the original work of Dias and coworkers [2] at low temperature, mild pressures, diamond anvil cell compression and prolong annealing may lead to selective doping of the lutetium hydride by 15N. The later attempted replication of Dias and coworkers by Hai-hu Wen and coworkers [3] may have caused different outcomes as Hai-hu Wen and coworkers appeared to try Dias work and then switched to a different synthetic method whereby Wen and coworkers instead applied high pressures and high temperatures to the reacting hydrogen, nitrogen and lutetium to produce a nitrogen doped lutetium hydride with similar lattice structure as the originally reported by Dias and coworkers [2] but lacking observed superconductivity and evidence of superconductivity by diamagnetism. The author here by his theory notes the possibility that the different later high pressure, high temperature synthesis by Wen and coworkers doped their sample with 14N rather than 15N as originally enriched in Dias’s sample. Thereby the author notes by his theory [1] that whereas 15N doped lutetium hydride manifests higher superconductivity due to its negative nuclear magnetic moment (NMM), the 14N doped lutetium hydride should not manifest superconductivity at the higher temperatures due to its positive NMM.
Category: Condensed Matter
[1] viXra:2303.0125 [pdf] submitted on 2023-03-20 11:27:14
Authors: Hans Peter Good
Comments: Pages.
It is hypothesized that superconducting transition temperatures are universal properties, which are amenable to a simple theoretical ansatz. The conjecture is supported by measured superconducting transition temperatures of many high quality samples. The experimental data contradict the mainstream view that an interaction between electrons and lattice vibrations is responsible for superconductivity.
Category: Condensed Matter
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