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Magnetism and Superconductivity in Nd_{0.81}Sr_{0.19}MnO_3/YBa_2Cu_3O_7 Superlattices

100%

Komissarov I., Przysłupski P., Dłużewski P., Sawicki M.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

127-132

We report on the growth, structural and magnetic characterization of Nd_{0.81}Sr_{0.19}MnO_3/YBa_2Cu_3O_7 (NSMO/YBCO) superlattices. The NSMO system for the doping level of x=0.19 is a ferromagnetic insulator. Multilayers with a fixed NSMO thickness of 13 unit cells and a varying YBCO layer thickness from 2 unit cells to 6 unit cells were sputtered on LaAlO_3 substrates. An onset of superconducting transition is seen starting from the multilayer with 3 unit cells of YBCO layer thickness. Hysteresis loops recorded above and below the superconducting transition show a signature of interlayer exchange coupling.

Barrier and Self-Energy Effects in Manganite Tunneling Characteristics

64%

Svistunov V., Revenko Y., Belogolovskii M., Gerasimenko A., Pashkevich Y., Szymczak H., Przyslupski P., Komissarov I.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

87-92

Tunneling conductance spectra of point-contact junctions formed by a sharp Ag tip and two optimally doped manganites La_{0.67}Sr_{0.33}MnO_3 and Nd_{0.67} Sr_{0.33}MnO_3 are measured and analyzed. It was found that the analytical dependence of the differential conductance on voltage strongly depends on the bias sign and dramatically changes after voltage treatments. The data obtained are explained in terms of the Glasman-Matveev model for tunneling across two localized states settled in the barrier near the manganite bulk. Effective functions of electron-boson interaction extracted from self-energy contributions to the experimental characteristics contain signs of phonon and magnon excitations, higher-energy satellites as a result of possible orbital ordering and a hallmark of localized states in the near-barrier region in the form of strong not-well reproduced peaks.

Dynamics of Hotspot Formation in Nanostructured Superconducting Stripes Excited with Single Photons

52%

Jukna A., Kitaygorsky J., Pan D., Cross A., Perlman A., Komissarov I., Sobolewski R., Okunev O., Smirnov K., Korneev A., Chulkova G., Milostnaya I., Voronov B., Gol'tsman G.

Acta Physica Polonica A

2008

vol. 113

issue 3

955-958

Dynamics of a resistive hotspot formation by near-infrared-wavelength single photons in nanowire-type superconducting NbN stripes was investigated. Numerical simulations of ultrafast thermalization of photon-excited nonequilibrium quasiparticles, their multiplication and out-diffusion from a site of the photon absorption demonstrate that 1.55 μm wavelength photons create in an ultrathin, two-dimensional superconducting film a resistive hotspot with the diameter which depends on the photon energy, and the nanowire temperature and biasing conditions. Our hotspot model indicates that under the subcritical current bias of the 2D stripe, the electric field penetrates the superconductor at the hotspot boundary, leading to suppression of the stripe superconducting properties and accelerated development of a voltage transient across the stripe.

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3 Acta Physica Polonica A

1 2008

2 2004

3 Komissarov I.

1 Belogolovskii M.

1 Chulkova G.

1 Cross A.

1 Dłużewski P.

1 Gerasimenko A.

1 Gol'tsman G.

1 Jukna A.

1 Kitaygorsky J.

1 Korneev A.

1 Milostnaya I.

1 Okunev O.

1 Pan D.

1 Pashkevich Y.

1 Perlman A.

1 Przyslupski P.

1 Przysłupski P.

1 Revenko Y.

1 Sawicki M.

1 Smirnov K.

1 Sobolewski R.

1 Svistunov V.

1 Szymczak H.

1 Voronov B.

Search results

Magnetism and Superconductivity in Nd_{0.81}Sr_{0.19}MnO_3/YBa_2Cu_3O_7 Superlattices

Barrier and Self-Energy Effects in Manganite Tunneling Characteristics

Dynamics of Hotspot Formation in Nanostructured Superconducting Stripes Excited with Single Photons