Negative heat capacity for a cluster of 147 sodium atoms.
There exists a surprising theoretical prediction for a small system: its microcanonical heat capacity can become negative. An increase of energy can-under certain conditions-lead to a lower temperature. Here we present experimental evidence that a cluster containing exactly 147 sodium atoms does indeed have a negative microcanonical heat capacity near its solid to liquid transition.
Schmidt
M
M
Fakultät für Physik, Universität Freiburg, H.Herderstrasse 3, D-79104 Freiburg, Germany.
Kusche
R
R
Hippler
T
T
Donges
J
J
Kronmüller
W
W
von Issendorff
B
B
Haberland
H
H