The isotherms of very thin PdHx films (60 Å<d<600 Å) have been determined below room temperature by equilibrium potential measurements. One finds that the critical temperature Tc is lowered when the film thickness decreases: for the 60‐Å film Tc would be near 173 K. This marked drop of Tc is attributed to clamping effects of the sample on the substrate, which decreases the effective H–H interaction and favors short‐range coherency effects.
REFERENCES
1.
2.
3.
E. Wicke and H. Brodowsky, in Hydrogen in Metals Topics in Applied Physics, Vol. 29 (Springer, New York, 1978), p. 73.
4.
5.
6.
R.
Feenstra
, G. J.
de Bruin‐Hordijk
, H. L. M.
Bakker
, R.
Griessen
, and D. G.
de Groot
, J. Phys. F
13
, L13
(1983
).7.
8.
R. Feenstra, D. G. de Groot, J. H. Rector, E. Salomons, and R. Griessen (unpublished).
9.
10.
T. B.
Flanagan
and F. A.
Lewis
, Trans. Faraday Soc.
55
, 1409
(1959
).11.
12.
13.
S.
Moehlecke
, C. F.
Majkrzak
, and M.
Strongin
, Phys. Rev. B
31
, 6804
(1985
).14.
C.
Chappert
, D.
Renard
, P.
Beauvillain
, J. P.
Renard
, and J.
Seiden
, J. Magn. Magn. Mater.
54–57
, 795
(1986
).15.
16.
17.
18.
19.
H.
Conrad
, G.
Bauer
, G.
Alefeld
, T.
Springer
, and W.
Schmatz
, Z. Phys.
266
, 239
(1974
).
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1986
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