From: O.R.Senthil Kumaran
To: Denis Howe
Cc: charlesmarie88@hotmail.com
Subject: Re: FOLDOC entry to edit: [Charles T. Marie
Date: Mon, 28 Jun 2004 22:40:37 +0530
Josepshson Junction
switching at very high speeds when operated at temperatures
approaching {absolute zero}.Its low power dissipation factor makes it
useful in {high density computer circuits}.
(2004-06-28)
----
Hi Denis,
Thanks again for providing me the oppurtunity to edit
FOLDOC. I have edited the Josephson Junction entry submitted to me on
May 28,2004.If you have any comments on it,kindly let me know.
I am ready to take up the next entry and contribute to FOLDOC.
Warm Regards,
Senthil
On Fri, 2004-05-28 at 06:01, Denis Howe wrote:
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> From: Charles T. Marie
> To: Denis Howe
>
> Subject: Josephson device (i.e. Josephson junction)
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> *** EOOH ***
> From: Charles T. Marie
> To: Denis Howe
>
> Subject: Josephson device (i.e. Josephson junction)
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> Josephson device (i.e. Josephson junction)
>
> Josephson junction (i.e. Josephson device - my comment)
>
> A Josephson junction is a type of electronic circuit capable of
> switching at very high speeds when operated at temperatures
> approaching absolute zero. Named for the British physicist who
> designed it, a Josephson junction exploits the phenomenon of
> superconductivity, the ability of certain materials to conduct
> electric current with practically zero resistance. Josephson junctions
> are used in certain specialized instruments such as highly-sensitive
> microwave detectors, magnetometers, and QUIDs. A Josephson junction
> is made up of two superconductors, separated by a nonsuperconducting
> layer so thin that electrons can cross through the insulating
> barrier. The flow of current between the superconductors in the
> absence of an applied voltage is called a Josephson current, and the
> movement of electrons across the barrier is known as Josephson
> tunneling. Two or more junctions joined by superconducting paths form
> what is called a Josephson interferometer.
>
> While researching superconductivity, Brian David Josephson studied the
> properties of a junction between two superconductors. Following up on
> earlier work by Leo Esaki and Ivar Giaever, he demonstrated that in a
> situation when there is electron flow between two superconductors
> through an insulating layer (in the absence of an applied voltage),
> and a voltage is applied, the current stops flowing and oscillates at
> a high frequency.
>
> The Josephson effect is influenced by magnetic fields in the vicinity,
> a capacity that enables the Josephson junction to be used in devices
> that measure extremely weak magnetic fields, such as superconducting
> quantum interference devices (SQUIDs). For their efforts, Josephson,
> Esaki, and Giaever shared the Nobel Prize for Physics in 1973.
> ------- End of forwarded message -------
>
> --
> Denis Howe
> Free On-Line Dictionary of Computing
> http://www.foldoc.org/
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