S. V. Dubonos

Russian Academy of Sciences

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A. K. Geǐm

Henry Royce Institute

I. V. Grigorieva

University of Manchester

АВ

А. В. Никулов

Institute of Microelectronics Technology and High Purity Materials

Kostya S. Novoselov

National University of Singapore

V. A. Tulin

Institute of Microelectronics Technology and High Purity Materials

ВЛ

В. Л. Гуртовой

Russian Quantum Center

F. M. Peeters

Universidade Federal do Ceará

СВ

С. В. Морозов

Institute for Physics of Microstructures

S. I. Zaitsev

Institute of Microelectronics Technology and High Purity Materials

J. G. S. Lok

Delft University of Technology

Cooperative Institutions

Institute of Microelectronics Technology and High Purity Materials

Russian Academy of Sciences

University of Manchester

Radboud University Nijmegen

Institute of Solid State Physics

Centre National de la Recherche Scientifique

Technical University of Denmark

University of Antwerp

Henry Royce Institute

National University of Science and Technology

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Mesoscopic conductivity fluctuations in samples with magnetic impurities

A. K. Geǐm S. V. Dubonos Ирина Юрьевна Антонова

Mesoscopic physics

Solid-state physics

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Citations (2)

<title>Quenching of the hall effect in localised high magnertic field region</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

S. V. Dubonos Kostya S. Novoselov A. K. Geǐm J. C. Maan

We report the suppression of the Hall effect in a mesoscopic Hall cross with a strong magnetic field only in the center and vanishingly small outside. The local magnetic field is produced by placing Dy pillar on top of a structure with high-mobility two-dimensional electron gas (2DEG). The effect is found to be due to a sharp increase of the number of back-scattered and quasi-localized electron orbits. The possibility of localizing electrons inside the magnetic inhomogeneity region is discussed.

Mesoscopic physics

Pillar

10.1117/12.514531

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Structure of single-wall carbon nanotubes synthesized in stationary acetylene atmosphere

Yu. A. Kasumov V. N. Matveev V. T. Volkov I. I. Khodos S. V. Dubonos

Acetylene

Carbon fibers

Source

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Multiple flux jumps and irreversible behavior of thin Al superconducting rings

Physical review. B, Condensed matter (2003)

D. Yu. Vodolazov F. M. Peeters S. V. Dubonos A. K. Geǐm

An experimental and theoretical investigation was made of flux jumps and irreversible magnetization curves of mesoscopic Al superconducting rings. In the small magnetic field region the change of vorticity with magnetic field can be larger than unity. This behavior is connected with the existence of several metastable states of different vorticity. The intentional introduction of a defect in the ring has a large effect on the size of the flux jumps. Calculations based on the time-dependent Ginzburg-Landau model allows us to explain the experimental results semi-quantitatively.

10.1103/physrevb.67.054506

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Citations (58)

Erratum: Fine Structure in Magnetization of Individual Fluxoid States [Phys. Rev. Lett. 85, 1528 (2000)]

Physical Review Letters (2001)

A. K. Geǐm S. V. Dubonos J. J. Palacios I. V. Grigorieva M. Henini

10.1103/physrevlett.86.1663

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Collective effects in vortex movements in type-II superconductors observed by a method for the registration of individual vortices

Physical review. B, Condensed matter (1992)

A. K. Geǐm I. V. Grigorieva S. V. Dubonos

A method for the registration of Abrikosov vortices in type-II superconductors has been employed for studying magnetic-flux propagation through a superconducting film. This method is based on measurements of the vortex-induced magnetoresistance in normal-metal microprobes placed in the immediate vicinity of a superconductor surface. The sensitivity of such probes provides a registration of individual vortex movements in a submicrometer area of the superconductor. With use of this technique, it is demonstrated that both the penetration of magnetic flux into the superconductor and its withdrawal are accomplished not by individual vortex movements but by the hopping of vortex bundles. The size of the hopping bundles appears to be much larger than the correlation volume in the vortex lattice. A description of flux penetration based on the critical-state model, which assumes a smooth gradient of the vortex concentration across the sample, has been found to break down on the microscopic scale.

Type-II superconductor

Magnetic flux quantum

Lattice (music)

Quantum vortex

10.1103/physrevb.46.324

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Citations (21)

Carbon nanofibers in a gradient-porous silicon structure

Technical Physics Letters (2006)

V. V. Starkov A. N. Reds’kin S. V. Dubonos

Porous Silicon

Carbon fibers