Abstract
The thermal conductivity,
K
s
, of superconductive tantalum and niobium has been measured between 0.2 and 1.2 °K, and for one niobium specimen between 0.2 and 4.2 °K. Large maxima in
K
s
occur in all three cases at ~ 0.2
T
C
and
K
s
has been analyzed into its electronic and lattice components
K
es
and
K
gs
. Agreement between experiment and the B.C.S. theory is good for tantalum between
T
= 0.5
T
C
and
T
=
T
C
, where
K
gs
is small. Below 0.5
T
C
conduction by phonons becomes appreciable. From the curves of
K
gs
against
T
the width of the energy gap at 0 °K has been deduced, giving (2Є
0
=) 3.8 ± 0.2
kT
C
for tantalum and (2Є
0
=) 3.5 ± 0.2
kT
C
for niobium.
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