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29 Jul 2002

Volume 81, Issue 5, pp. 789-944

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Hysteretic behavior in metallic granular matter

S. Dorbolo, M. Ausloos, and N. Vandewalle

Appl. Phys. Lett. 81, 936 (2002); http://dx.doi.org/10.1063/1.1496501 (3 pages) | Cited 10 times

Online Publication Date: 22 July 2002

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Various packings made of metallic grains have been electrically characterized. Electrical breakdown is observed in I–V curves. A well defined critical point separates the insulating and the conducting regime of the packing. The breakdown is reversible by submitting the packing to a small tap. This unusual property leads to hysteretic loops in I–V diagrams. The study of the behavior of I–V curves allows us to describe the system as a network of weak lossy contacts. The key parameter is the inner electrical field controlling the diode-like or diffusion-like state of the packing. © 2002 American Institute of Physics.
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71.30.+h Metal-insulator transitions and other electronic transitions
81.05.Rm Porous materials; granular materials
72.60.+g Mixed conductivity and conductivity transitions
72.80.Tm Composite materials
77.22.Jp Dielectric breakdown and space-charge effects
72.15.Eb Electrical and thermal conduction in crystalline metals and alloys

Efficient isotropic magnetic resonators

Philippe Gay-Balmaz and Olivier J. F. Martin

Appl. Phys. Lett. 81, 939 (2002); http://dx.doi.org/10.1063/1.1496507 (3 pages) | Cited 44 times

Online Publication Date: 22 July 2002

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We study experimentally and numerically a novel three-dimensional magnetic resonator structure with high isotropy. It is formed by crossed split-ring resonators and has a response independent of the illumination direction in a specific plane. The utilization of such elements to build a finite left-handed medium is discussed. © 2002 American Institute of Physics.
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85.70.-w Magnetic devices

Photoinduced photoluminescence intensity enhancement in poly(p-phenylene vinylene) films

Y. Galvão Gobato, A. Marletta, R. M. Faria, F. E. G. Guimarães, J. M. de Souza, and E. C. Pereira

Appl. Phys. Lett. 81, 942 (2002); http://dx.doi.org/10.1063/1.1497198 (3 pages) | Cited 8 times

Online Publication Date: 22 July 2002

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We report measurements of photoluminescence (PL) intensity enhancement in poly(p-phenylene vinylene) (PPV) films induced by light irradiation in the presence of air. This effect is dependent on laser intensity and the ratio between film thickness and excitation penetration depth. The results suggest that an efficient spectral diffusion of excited carriers to nondegraded PPV segments by Förster energy transfer is an important consideration in the PL efficiency of conjugated polymers light-irradiated in air. © 2002 American Institute of Physics.
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78.55.Kz Solid organic materials
78.66.Qn Polymers; organic compounds
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
61.82.Pv Polymers, organic compounds
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