Superconductivity in the ensembles of small metallic particles

Morozov, Yu. G.; Petinov, V. I.

doi:10.1016/0038-1098(81)90051-x

Cited by 21 publications

(9 citation statements)

References 8 publications

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“…Fig. 4.4 shows the magnetic moment observed by Morozov and coworkers [204] on a collection of small tin particles at temperatures between 3.57 K and 3.09 K. The full curves represent the theoretical prediction, based on Ovchinnikov's [206] straightforward extension of Larkin's model as discussed in section 4.3.2.1. In the theoretical curves, the measured particle size distributions have properly been taken into account.…”

Section: Experimental Investigationsmentioning

confidence: 97%

“…Due to the lack of appropriate theories, these results were interpreted in a more qualitative way, using the sort of London theory as sketched in section 4.2, combined with a Gorter-Casimir two fluid model. The advances of the more microscopic theory have triggered new experimental investigations of the magnetization of small superconducting particles [204,205]. Fig.…”

Section: Experimental Investigationsmentioning

confidence: 99%

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Electronic properties of small metallic particles

1981

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Introduction 175 4.2. Magnetization of small superconducting particles 2. Phenomenological description of small particles 178 4.3. Microscopic theory of small superconductors 2.1. Interaction with electromagnetic radiation 178 4.4. Fluctuations in small superconducting particles 2.2. Mie's theory 178 5. Preparation of small particles 2.3. The dielectric constant of a small metallic particle 184 5.1. Metal colloids 2.4. The effective dielectric constant of the embedding 5.2. Granular metal films medium 189 5.3. Particles prepared by the gas-evaporation technique 3. Quantum size effects in small metallic particles 192 5.4. Particles prepared by nucleation and growth in a 3.1. Microscopic description of electrons in small particles 192 matrix 273 3.2. Kubo's small particle 197 5.5. Impregnated porous materials 275 3.3. Level statistics 201 Appendix I. Thermodynamic calculations for Kubo's small 3.4. Spectroscopy of the small particle level structure 213 particle 3.5. Experiments 217 Appendix II. Thermodynamic calculations for the particle 4. Superconductivity in small particles 232 with equal level spacing 4.1. Characteristic lengths of superconductors 232 References

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Section: Experimental Investigationsmentioning

confidence: 97%

Section: Experimental Investigationsmentioning

confidence: 99%

Electronic properties of small metallic particles

1981

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“…Solution phase syntheses of many types of metallic nanoparticles and particle colloids are well-known in the literature. , Production of lead particles, however, has mainly been limited to evaporated or sputtered Pb island films. , These Pb island films have been utilized in many beautiful and classic experiments aimed at probing superconducting transport mechanisms through the percolation transition. However, to our knowledge, none of the films that have been utilized for those experiments have ever been subjected to any sort of direct structural characterization.…”

Section: Methodsmentioning

confidence: 99%

Josephson Coupled Quantum Dot Artificial Solids

et al. 2000

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Josephson coupled quantum dot artificial solids were prepared from 20 ( 4 nm diameter organically functionalized Pb particles. Interparticle separation distances were varied from approximately 26 to 11 Å by varying the passivating organic ligand. Isolated particles were too small to exhibit a Meisner effect by themselves, and so it was possible to employ SQUID magnetometry as a zero-background probe for Cooper pair delocalization in these solids. As the interparticle separation distance was decreased, the quantum dot solids progressed from a Mott insulator to a strongly localized superfluid, and finally to a superfluid.

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“…The attempt to understand whether T c in granular systems increases in every individual grain or the superconductivity enhancement is the consequence of the electronic state correlations over a length much larger that the particle size was performed in [318]. Ensembles of fine crystalline Sn, In, Pb, La and V nanoparticles (10-500 nm in size) were fabricated by vapor condensation in an inert gas flow of isolated from each other nanoparticles represented a suspension of them in paraffin.…”

Section: Qse In Nanoparticlesmentioning

confidence: 99%

Phonon softening in nanostructured phonon–mediated superconductors (review)

Prischepa

Kushnir

2023

J. Phys.: Condens. Matter

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Various aspects of phonon spectrum changes in nanostructured phonon-mediated superconductors are considered. It is shown how, with the development of experimental techniques and, accordingly, obtaining new results, the understanding of the influence of the surface and nanoscale on the magnitude of the electron-phonon interaction and the critical temperature Tc changed and deepened. The review is organized as follows. After the Introduction, in the first part we give the quick theoretical background for the description of superconductivity within the framework of various formalisms. In the second part we describe the properties of granular thin films paying attention to the impact of grain sizes and methods of deposition on the Tc value. The role of material parameters is underlined and different aspects of the behavior of granular thin films are discussed. In the third section the impact of external sources of modification of the phonon spectra like noble gases and organic molecules are considered. Problems and progress in this area are discussed. The fourth part is dedicated to the phonon modification and related quantum size effects in nanostructured superconductors. In the fifth part we review the results of direct evidence of phonon softening in nanostructured superconductors and in the sixth section we discuss a possible alternative description of the superconducting properties of nanostructured superconductors related to the concept of metamaterials. In the seventh and eighth parts we review the impact of substrates with lattice mismatched parameters and graphene sheets, respectively, on the modification of the phonon spectrum and enhancement of superconductivity in various superconducting thin films. Finally, in the last ninth section we consider the nonequilibrium superconductivity driven by femtosecond pulses of light, which leads to generation of coherent phonons and to a significant increase in the critical temperature in a number of superconducting materials.

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Superconductivity in the ensembles of small metallic particles

Cited by 21 publications

References 8 publications

Electronic properties of small metallic particles

Electronic properties of small metallic particles

Josephson Coupled Quantum Dot Artificial Solids

Phonon softening in nanostructured phonon–mediated superconductors (review)

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