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3 Jan 2000

Volume 76, Issue 1, pp. 1-128

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Enhancement of Jc by 211 particles in ternary (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy melt-processed superconductors

M. Muralidhar, M. R. Koblischka, P. Diko, and M. Murakami

Appl. Phys. Lett. 76, 91 (2000); http://dx.doi.org/10.1063/1.125666 (3 pages) | Cited 29 times

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(Nd0.33Eu0.33Gd0.33)2BaCuO5 (NEG-211) particles are added to ternary (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy (NEG) bulk, melt-processed superconductors. By means of transmission electron and polarized light microscopy, we found that two types of 211 particles are formed; large NEG-211 and submicron-sized particles containing mostly Gd in the rare earth site are formed which can act as effective flux pinning sites. The critical current density at zero field increases monotonously as a function of the NEG-211 concentration, but the secondary peak vanishes above 40 mol % 211 addition. As a result, a critical current density of 68 000 A cm−2 at 77 K and 2.5 T applied field is achieved with at 40 mol % 211 additions. © 2000 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.62.Dh Effects of crystal defects, doping and substitution

Microstructure and magnetic behavior of carbon-coated Co nanoparticles studied by nuclear magnetic resonance

Y. D. Zhang, J. I. Budnick, W. A. Hines, S. A. Majetich, and E. M. Kirkpatrick

Appl. Phys. Lett. 76, 94 (2000); http://dx.doi.org/10.1063/1.125667 (3 pages) | Cited 15 times

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Spin-echo nuclear magnetic resonance (NMR) experiments have been carried out at 4.2 K and room temperature on carbon-coated nanoscale (average diameter ≈20 nm) face-centered-cubic (fcc) Co particles prepared by the Kratschmer carbon arc process for 0 ⩽ H ⩽ 9.0 kOe. Information concerning the magnetic structure and paramagnetic relaxation behavior of the nanoscale particle system has been obtained. © 2000 American Institute of Physics.
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76.60.Lz Spin echoes
75.50.Kj Amorphous and quasicrystalline magnetic materials
61.46.-w Structure of nanoscale materials
75.50.Tt Fine-particle systems; nanocrystalline materials
75.50.Cc Other ferromagnetic metals and alloys
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

Magneto-optical properties and the potential application of GaAs with magnetic MnAs nanoclusters

H. Akinaga, S. Miyanishi, K. Tanaka, W. Van Roy, and K. Onodera

Appl. Phys. Lett. 76, 97 (2000); http://dx.doi.org/10.1063/1.125668 (3 pages) | Cited 54 times

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The giant magneto-optical effect of ferromagnetic MnAs nanoclusters embedded in GaAs is shown. The Faraday rotation angle at 0.98 μm reaches about 0.2°/μm at 2000 Oe. The potential of this magneto-optical material for use as a Faraday rotator operating at 0.98 μm is demonstrated by the Verdet constant of the film which is 16 times larger than that of (Cd,Mn,Hg)Te commercially developed for an optical isolator. The fabrication of this material is compatible with that of semiconductor-based devices. © 2000 American Institute of Physics.
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75.50.Pp Magnetic semiconductors
75.50.Tt Fine-particle systems; nanocrystalline materials
78.20.Ls Magneto-optical effects

Current-phase relationship of YBa2Cu3O7−x ramp-edge Josephson junctions

E. Il’ichev, V. Zakosarenko, V. Schultze, H. E. Hoenig, H.-G. Meyer, K. O. Subke, H. Burkhardt, and M. Schilling

Appl. Phys. Lett. 76, 100 (2000); http://dx.doi.org/10.1063/1.125669 (3 pages) | Cited 4 times

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The current-phase relation (CPR) of high-Tc ramp-edge Josephson junctions (YBa2Cu3O7−x/PrBa2Cu3O7/YBa2Cu3O7−x) was investigated experimentally in the temperature range 65<T<85 K. The investigated junctions were incorporated into a washer-shaped superconducting loop with inductance L ≈ 80 pH forming a single-junction interferometer. The CPR was obtained from the measurement of the impedance of the phase-biased junction. We show that, for junctions with sufficiently small critical current Ic, the CPR is sinusoidal. In the case of larger critical current, deviations of the apparent CPR from sinusoidal dependence were found. These deviations can be described by thermal fluctuations of the magnetic flux in the loop. So we conclude that, for all investigated junctions, the “true” CPR is sinusoidal. © 2000 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.50.+r Tunneling phenomena; Josephson effects
74.40.-n Fluctuation phenomena
74.25.Sv Critical currents
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