Deceptive signals of phase transitions in small magnetic clusters

Details Deceptive signals of phase transitions in small magnetic clusters Deceptive signals of phase transitions in small magnetic clusters

2001-07-09

arxiv.org/abs/cond-mat/0107176v2

Phys. Rev. Lett. 88, 053401 (2002)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, revtex4, for further information see http://www.smallsystems.de

Scientific paper

10.1103/PhysRevLett.88.053401

We present an analysis of the thermodynamic properties of small transition metal clusters and show how the commonly used indicators of phase transitions like peaks in the specific heat or magnetic susceptibility can lead to deceptive interpretations of the underlying physics. The analysis of the distribution of zeros of the canonical partition function in the whole complex temperature plane reveals the nature of the transition. We show that signals in the magnetic susceptibility at positive temperatures have their origin at zeros lying at negative temperatures.

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