Negative magnetoresistance in small superconducting loops and wires

Santhanam, P.; Umbach, C. P.; C., C.

doi:10.1103/physrevb.40.11392

Cited by 29 publications

(32 citation statements)

References 15 publications

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“…The sheet resistance of the loops was equal approximately 0.5 Ω/⋄ at 4.2 K, the resistance ratio R(300K)/R(4.2K) ≈ 2 and the midpoint of the superconducting resistive transition T c ≈ 1.24 K. All loops exhibited the anomalous features of the resistive dependencies on temperature and magnetic field which was before observed on mesoscopic Al structures in some works [24,28].…”

Section: Persistent Voltagementioning

confidence: 60%

<title>Quantum power source: putting in order of a Brownian motion without Maxwell's demon</title>

Аристов

Nikulov

2003

SPIE Proceedings

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The problem of possible violation of the second law of thermodynamics is discussed. It is noted that the task of the well known challenge to the second law called Maxwell's demon is put in order a chaotic perpetual motion and if any ordered (non-chaotic) Brownian motion exists then the second law can be broken without this hypothetical intelligent entity. The postulate of absolute randomness of any Brownian motion saved the second law in the beginning of the 20th century when it was realized as perpetual motion. This postulate can be proved in the limits of classical mechanics but is not correct according to quantum mechanics. Moreover some enough known quantum phenomena, such as the persistent current at non-zero resistance, are an experimental evidence of the non-chaotic Brownian motion with non-zero average velocity. An experimental observation of a dc quantum power source is interpreted as evidence of violation of the second law.

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Section: Persistent Voltagementioning

confidence: 60%

<title>Quantum power source: putting in order of a Brownian motion without Maxwell's demon</title>

Аристов

Nikulov

2003

SPIE Proceedings

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“…The observation of nMR in sub 100 nm wide wires showed that suppression of non-equilibrium charge-imbalance processes by B , might play a key role in electronic transport below T C , and on the contrary its effect on wider wires and the 2D film is negligible. Although the dimensions of tin micro bridges49 is significantly larger than our wires, the Al loops50 are of the same dimensions. But these results were obtained and explained with charge imbalance theory at much higher T (≥0.3 K) than ours (50 mK).…”

Section: Resultsmentioning

confidence: 78%

Negative Magnetoresistance in Amorphous Indium Oxide Wires

Mitra

Tewari

Mahalu

et al. 2016

Sci Rep

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We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there exist a finite resistance at the lowest temperature. The R(T) broadening was explained by available phase slip models. At low field, and far below the superconducting critical temperature, the wires with diameter equal to or less than 100 nm, show negative magnetoresistance (nMR). The magnitude of nMR and the crossover field are found to be dependent on both temperature and the cross-sectional area. We find that this intriguing behavior originates from the interplay between two field dependent contributions.

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“…The latter effect, i.e., a negative slope, was observed in aluminum microstructures previously. 3 In that same study it was also shown that at sufficiently large currents the structure becomes an NS structure, i.e., an NS boundary arises when the total width of the current-transporting structure varies along the current direction. In our case the total width along the current direction varied by a factor of 2, as can be seen in Fig.…”

Section: Resultsmentioning

confidence: 91%

Resistive quantum oscillations in superconducting aluminum microstructures

et al. 1996

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Anomalous, periodic oscillations in the electrical resistance versus applied magnetic field have been found in aluminum ring microstructures at temperatures in the superconducting transition region. At low fields the oscillations, occurring at intervals of the flux quantum ϭh/2e, are characterized by sharp dips in resistance versus field, on a decreasing background. The quantum-interference resistance variations are explained by periodic variations in the length Q for excess density of quasiparticles penetrating from normal-metal regions into superconducting regions of the structure. These length variations are caused by periodic variations in critical current.

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Negative magnetoresistance in small superconducting loops and wires

Cited by 29 publications

References 15 publications

<title>Quantum power source: putting in order of a Brownian motion without Maxwell's demon</title>

<title>Quantum power source: putting in order of a Brownian motion without Maxwell's demon</title>

Negative Magnetoresistance in Amorphous Indium Oxide Wires

Resistive quantum oscillations in superconducting aluminum microstructures

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