Quantum theory of unusual heat-resistant superconductivity in polymers

Grigorov, L. N.

doi:10.1080/014186398258023

Cited by 6 publications

(5 citation statements)

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“…Finally, we would like to make a parallel between our studies 1 and earlier reports on the interplay between ferromagnetic-and superconductinglike behavior of oxidized atatic polypropylene (OAPP) and amorphous poly(dimethylsiloxane) (PDMS) polymers samples. [44][45][46] In both graphitic systems and the polymers, the occurrence of either ferromagnetic-or superconducting-like magnetization at room temperature depends on heat treatment, oxidation, light illumination, and time (aging effect). Besides, in the case of OAPP, a strong enough applied magnetic field could transform the superconducting-like M (H) to the ferromagnetic-like M (H) in an irreversible way, which has been attributed to the field-induced breaking of diamagnetic (superconducting) loops, resulting in a formation of ferromagnetic stripes.…”

Section: Superconductivity In Carbon Systems: Recent Studies and Outlookmentioning

confidence: 99%

Ferromagnetism and Superconductivity in Carbon-based Systems

Kopelevich

Esquinazi

2007

J Low Temp Phys

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Section: Superconductivity In Carbon Systems: Recent Studies and Outlookmentioning

confidence: 99%

Ferromagnetism and Superconductivity in Carbon-based Systems

Kopelevich

Esquinazi

2007

J Low Temp Phys

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“…The channels have maximum diameters of the order of 1 µm (Demicheva et al 1990), but for theoretical reasons , 1991) it is thought that the channels are composed of large numbers of smaller nanofilaments, known as superpolarons, of diameters of the order of one to a few nm. The only two types of published theory for superconductivity in the channels of which the author is aware (Eagles 1994a, 1994b, Grigorov 1998) make use of the assumption that the channels are composed of many quasi one-dimensional filaments. The present author (Eagles 1998a) and Grigorov and coworkers (see e.g.…”

Section: §1 Introductionmentioning

confidence: 99%

Analysis of room-temperature results on normally conducting and superconducting channels through polymer films

Eagles

2005

Philosophical Magazine

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There are strong reasons from dc and pulsed-current measurements, and from thermal conductivity results, for thinking that narrow channels through films of oxidised atatic polypropylene (OAPP) are superconducting at room temperature. It is thought that the conducting channels, with diameters less than or of the order of a micrometre, are composed of smaller nanofilaments, with diameters of the order of a nanometre. In the present paper a possible explanation is given of measurements which show that the average resistance of non-superconducting channels through films increases with film thickness more slowly than linearly. This result is interpreted in terms of how the Bose condensation temperatures of bosons in arrays of nanofilaments depend on the length and numbers of filaments, and examples are given of parameters of the arrays which could explain the data. The dispersion for the bosons is assumed to consist of a sum of linear and quadratic terms, which is an approximate type of dispersion reported for Cooper pairs. In order to fit the data with the model used, it is necessary to suppose that values of superconducting T c for channels composed of large numbers of filaments are only slightly above room temperature. It is argued that larger T c 's reported in 1989 when currents of 0.5 A are passed through channels may arise because (a) currents concentrate in a subchannel of smaller width than the original channel, and (b) current-current interactions draw the filaments of the subchannel sufficiently close together to increase the transverse bandwidth and T c in the model by the required amount.

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“…Alternative theory of Grigorov for superconductivity Grigorov [49,50] has a completely different type of theory for superconducting channels involving pairs of oppositely moving charged density waves along each superpolaron string. In his theory he appears to think that the superconductivity will occur even for isolated superpolaron strings.…”

Section: Stability Of Electron Stringsmentioning

confidence: 99%

“…one-dimensional strings of a certain type of polaron involving electrons interacting with rotatable dipolar groups. An unusual theory for superconductivity in such channels involving motion of oppositely directed charge density waves was developed by Grigorov [49,50]. An earlier theory by me for the superconductivity involving large enhancements of pairing interactions at certain high drift velocities [51,52] has had to be abandoned, because recent work on bipolarons in one dimension [53] gives no support for the greatly enhanced interactions at such velocities predicted by perturbation-type methods.…”

Section: Introductionmentioning

confidence: 99%

Modification of a Charged-Bose-Gas Model for Observed Room-Temperature Superconductivity in Narrow Channels Through Films of Oxidized Atactic Polypropylene

Eagles

2011

Int. J. Mod. Phys. B

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Reasons have been found for thinking that the minimum diameter of channels of a given length to support superconductivity at room temperature through films of oxidised atactic polypropylene (OAPP) is considerably larger than found in a model for Bose condensation in an array of nanofilaments [D.M. Eagles, Phil. Mag. 85, 1931] used previously. This model was introduced to interpret experimental results dating from 1988 on OAPP. The channels are thought to be of larger diameter than believed before because, for an N-S-N system where the superconductor consists of an array of single-walled carbon nanotubes, the resistance, for good contacts, is R Q /2N , where N is the number of nanotubes and R Q = 12.9 kΩ [See e.g. M. Ferrier et al., Solid State Commun. 131, 615 (2004)]. We assume this would be 2R Q /N for a triplet superconductor with all spins in the same direction and no orbital degeneracy, which may be the case for nanofilaments in OAPP. Hence one may infer a minimum number of filaments for a given resistance. In the present model, the E(K) curve for the bosons is taken to be of a Bogoliubov form, but with a less steep initial linear term in the dispersion at T c than occurs at low T . This form is different from the simple linear plus quadratic dispersion, with a steeper initial slope, used in my 2005 paper. A combination of theory and experimental data has been used to find approximate constraints on parameters appearing in the theory.

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Quantum theory of unusual heat-resistant superconductivity in polymers

Cited by 6 publications

References 0 publications

Ferromagnetism and Superconductivity in Carbon-based Systems

Ferromagnetism and Superconductivity in Carbon-based Systems

Analysis of room-temperature results on normally conducting and superconducting channels through polymer films

Modification of a Charged-Bose-Gas Model for Observed Room-Temperature Superconductivity in Narrow Channels Through Films of Oxidized Atactic Polypropylene

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