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Phys Rev Lett. 2001 Feb 12;86(7):1191-4.

Negative heat capacity for a cluster of 147 sodium atoms.

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Fakultät für Physik, Universität Freiburg, H.Herderstrasse 3, D-79104 Freiburg, Germany.


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.

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