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(revised, 4/17/00)
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{\bf SUPERCONDUCTING SQUID MEASUREMENTS}\\
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{Advanced Laboratory, Physics 407 } \\
{University of Wisconsin} \\
{Madison, Wisconsin 53706} \\
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\begin{abstract}
	The basic properties of a thin film, high critical temperature 
	Superconducting Quantum Interference Device (SQUID) are studied. 
	The SQUID is made of yttrium barium copper oxide ($\rm 
	Y_1Ba_2Cu_3O_7$) which becomes superconducting at about $90^\circ$K
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This experiment consists of three parts.
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Part 1:  The basic squid properties are studied. These measurements include a
study of the Josephson DC Effect and the direct observation of flux quantization. 
\item
Part 2: The AC Josephson Effect is observed and the measurements lead to a
determination of h/e. A microwave generator is used for this purpose. 
\item
Part 3: The transition temperature of the superconducting material is measured
using a silicon diode as a thermometer. The temperature of the squid is varied and
the transition temperature to the superconducting state is determined. 
\end{enumerate} 

The details are described in the following text which contains a section
for each of the three parts. The Appendix contains the squid electrical
and mechanical specifications.  

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	REFERENCES
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	\item Chapter 21, pp.\ 21-1 to 21-18 in Feynman Lectures on 
	Physics Vol.\ 3, by Feynman, Leighton, and Sands.
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