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Browse Prior Art Database

Barrier Layer Dielectric with Superconducting Grains

IP.com Disclosure Number: IPCOM000108997D
Original Publication Date: 1992-Jul-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 48K

Publishing Venue

IBM

Related People

Chance, DA: AUTHOR [+3]

Abstract

Disclosed are materials and structure for fabricating grain boundary barrier layer (GBBL) dielectric materials (1) having high dielectric constant at high frequencies. A primary feature is the use of superconducting grains (see the figure).

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Barrier Layer Dielectric with Superconducting Grains

       Disclosed are materials and structure for fabricating
grain boundary barrier layer (GBBL) dielectric materials (1) having
high dielectric constant at high frequencies.  A primary feature is
the use of superconducting grains (see the figure).

      In general, it is only in the range of frequencies below a
characteristic dispersion frequency that GBBL materials are of
interest since this is the region of high dielectric constant (2).
The characteristic dispersion frequency is given by, wd = k|Kblpg,
where k = constant, Kbl = dielectric constant of the boundary layer,
and pg = resistivity of the grains.

      It is observed in the above equation that the dispersion
frequency can be increased substantially by decreasing the
resistivity of the grains.  The resistivity of the superconducting
grains below their superconducting temperatures is zero.  Thus, such
materials will have high dielectric constant at high frequencies
below the superconducting transition temperatures.  Examples of
materials suitable for the superconducting grains are Y1Ba2Cu3O7 - x,
superconducting below Z90~K and La2-xSrxCu4-x, superconducting below
Z40~K.  Examples of materials suitable for the insulating boundary
phase are high Pb glass (Corning 8871), organic materials, such as
polyimides, and an insulating phase formed from elements composing
the superconducting grains (e.g., a material of Cu, Ba and O).

      Referenc...