Direct evidence for the laminar and flux line models of mixed state in type II superconductors

Sarma, N. V.

doi:10.1016/0375-9601(67)90671-8

Cited by 27 publications

(8 citation statements)

References 2 publications

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“…1 (d) and 1 ( f ) respectively. It was also found that in some regions the flux lattice broke up into flux bundles along close packed directions (Sarma 1967 …”

Section: Experimental Methodsmentioning

confidence: 97%

“…yo I n and Pb-2 at. yo I n superconducting specimens (Sarma 1968) where the patterns were coarse in regions of low indium content and fine in regions of high indium content. Figures 1 ( e ) and 1 (f) show the gradual progression from intermediate state patterns to a honeycomb pattern which ends in a flux lattice.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…A magnetic field applied parallel to the axis of the disc was cycled from 0 to 550 oe t o 165 oe and a Bitter pattern formed on an end face of the disc by the deposition of fine cobalt particles. The apparatus and the technique used for replicating the Bitter pattern have been described elsewhere (Sarma andMoon 1967, Sarma 1968). $ 3 .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…It has been predicted (Abrikosov 1957) that the disc enters the mixed state first if K % 1/.\/2, where K is its Ginsberg-Landau parameter and that it enters the intermediate state otherwise. Intermediate state structures have been observed (Sarma 1968) in Pb-1 at. yo I n and Pb-2 at.…”

Section: Introductionmentioning

confidence: 91%

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Transition from the flux lattice to the intermediate state structures in a lead-indium alloy

Sarma

1968

The Philosophical Magazine: A Journal of Theoretical Experiment

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“…1 (d) and 1 ( f ) respectively. It was also found that in some regions the flux lattice broke up into flux bundles along close packed directions (Sarma 1967 …”

Section: Experimental Methodsmentioning

confidence: 97%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

See 2 more Smart Citations

Transition from the flux lattice to the intermediate state structures in a lead-indium alloy

Sarma

1968

The Philosophical Magazine: A Journal of Theoretical Experiment

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“…As a result, Hc1 field transforms the conductor into the 'mixed' (metastable in nature) state and preserves its superconducting properties, and the field above Hc2 destroys them. Experimental observation of the structures of soft and hard superconductors being in the intermediate and mixed states was carried out in 1967 by H. Tauble and U. Essman [44], and N. V. Sarma [45,46] using the electron microscope of 10 nm resolution. The schematic figure of magnetic field distribution in the conductors of different types is represented in Fig.…”

Section: Superconductivity Thermodynamics and Electrodynamicsmentioning

confidence: 99%

High-temperature superconductivity: From macro- to nanoscale structures

Коваленко¹

2016

Nanosystems: Phys. Chem. Math.

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The analysis of achievements, problems and prospects of high-temperature superconductivity (HTSC) in the macro-and nanostructured materials has been given. The main experimental results and theoretical models describing the physical mechanisms of the superconductivity appearance at phenomenological and microscopic levels, including change in the energy spectrum of atoms in these materials with the advent of the 'superconducting' gap at temperatures below the critical transition, as well as the above-critical temperature 'pseudo-gap' have been analyzed.Although the origin of the pseudo-gap is not completely understood, it can be considered as an independent phase transition in the substance prior to the transition to the zero resistance state and insusceptibility (or insensitivity) to external magnetic field in high-temperature superconductors. Features of multi-gap and gapless superconducting materials as well as their ability to further increase the temperature of supercritical transition are discussed. Large resources to create the necessary electron and phonon spectra in the process of high-temperature superconductivity formation are associated with the use of nanoscale structures and nanoparticles of conductors and dielectrics. Electrical conductive contacts between nanoparticles and tunnel chains of nanoclusters, where delocalized electron spectra form similar energy shells to the atomic or nuclear shells, play a significant part here. It is required to further investigate the occurrence of high-temperature superconductivity at the level of interphase layers (non-autonomous phases) in nanostructures containing a large fraction of the substance in this condition. It is essential to develop adequate methods for synthesis of nanoparticles of variable size, structure and morphology, as well as techniques for their consolidation that would ensure the preservation of superconductivity of individual nanoparticles, their chemical, thermal, magnetic and current stability in the dissipative processes with functional and fluctuation effects.

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Direct Observation of Magnetic Structure in Niobium Single Crystals with Hydride Precipitate Pinning Centres

Golubok

1982

phys. stat. sol. (a)

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The high resolution direct observation of the Nb single crystal magnetic structure due to hydride precipitate pinning centers is presented. The magnetic structure is studied by depositing ferromagnetic particles on a sample surface in magnetic field (H = 0 → 6000 Oe → 250 Oe) perpendicular to the {100} and {110} planes. The Bitter patterns obtained are observed with a scanning electron microscope.

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Direct evidence for the laminar and flux line models of mixed state in type II superconductors

Cited by 27 publications

References 2 publications

Transition from the flux lattice to the intermediate state structures in a lead-indium alloy

Transition from the flux lattice to the intermediate state structures in a lead-indium alloy

High-temperature superconductivity: From macro- to nanoscale structures

Direct Observation of Magnetic Structure in Niobium Single Crystals with Hydride Precipitate Pinning Centres

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