Structure and thermodynamics of spherical Yukawa and Coulomb clusters

Hiroo Totsuji, Takafumi Ogawa, Chieko Totsuji, Kenji Tsuruta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Structures in the ground state and thermodynamics related to melting of spherical Yukawa and Coulomb clusters confined in external fields of less than 103 particles are discussed on the basis of molecular dynamics and Monte Carlo simulations and theoretical methods. At low temperatures, particles form concentric shell structures which are expressed by simple formulas and insensitive to the strength of screening. Structures are reproduced by the shell model when the intrashell cohesive energy is properly taken into account. The specific heat of clusters of relatively small sizes 100 ≤ Nd ≤ 400 has two peaks as a function of temperature. By analyses of diffusions, it is shown that the peaks at lower and higher temparatures corresponds to the loss of ordering in the azimuthal and radial (and therefore total) ordering, respectively. Magnitudes of fluctuations in the outermost shell are consistent with the conventional Lindemann criterion.

Original languageEnglish
Title of host publicationNON-NEUTRAL PLASMA PHYSICS VI
Subtitle of host publicationWorkshop on Non-Neutral Plasmas 2006
Pages232-241
Number of pages10
DOIs
Publication statusPublished - Dec 1 2006
EventNON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006 - Aarhus, Denmark
Duration: Jun 25 2006Jun 29 2006

Publication series

NameAIP Conference Proceedings
Volume862
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherNON-NEUTRAL PLASMA PHYSICS VI: Workshop on Non-Neutral Plasmas 2006
CountryDenmark
CityAarhus
Period6/25/066/29/06

Keywords

  • Ground state
  • Melting
  • Specific heat
  • Structure
  • Thermodynamics
  • Yukawa and Coulomb clusters

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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