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https://hdl.handle.net/2142/25799
Description
Title
Heat capacity of gadolinium near the Curie point
Author(s)
Lewis, Edwin Augustus Stevens
Issue Date
1969
Doctoral Committee Chair(s)
Slichter, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
heat capacity
gadolinium
Curie point
temperature modulation method
power law
Language
en
Abstract
"The dependence of the heat capacity of gadolinium on
temperature has been observed close to the ferromagnetic Curie
point at about 180 C. An ""ac"" or temperature modulation method
allowed the use of very small single crystal samples. The
heat capacity peak for our best sample is rounded in a range
of lO at the Curie point (Tc ). Outside this region, good
power law fits are obtained fora range of values of the
critical exponents alpha (above Tc) and alpha' (below Tc )' the choice
of which depends on the choice of Tc
The entire set of data, including that in the rounded
region, fits an expression derived from a simple macroscopic model of rounding. The Tc specified by this fit makes
alpha = -.09 +/- .05 and alpha = -.32 +/- .05. Our results on Curie point and rounding are in disagreement
with recent conjectures of Cadieu and Douglass for gadoliniumo"
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