Published September 1981
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On the global character of some restricted equilibrium conditions - a remark on metastability
Description
For classical lattice systems with finite range interactions it is proven that if a state minimizes a free-energy functional at non-zero temperature with respect to variations of the state inside all regions of limited size (for instance, all regions with only one lattice site) the n it is a Gibbs state. This result rules out the possibility of defining metastable states at T different 0 as those which satisfy the thermodynamical stability conditions for regions with small volume to surface ratio, unlike the T=0 case. (Author)
Availability note (English)
MF available from INIS under the Report Number.Abstract (Portuguese)
Prova-se que, para sistemas de rede classicos com interacoes de alcance finito, se um estado minimiza um funcional de energia livre a temperatura diferente de zero em relacao a variacoes dos estados dentro de todas as regioes de tamanho limitado (por exemplo, todas as regioes com um unico sitio de rede) entao ele e um estado de Gibbs. Esse resultado exclui a possibilidade de definir-se estados metaestaveis a T diferente de 0 como aqueles que satisfazem as condicoes de estabilidade termodinamica para regioes com pequena razao volume para superficie, diferentemente do caso T=0. (L.C.)Files
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Additional details
Publishing Information
- Imprint Pagination
- 12 p.
- Report number
- IFUSP-P--294
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 13700727
- Subject category
- S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Descriptors DEI
- FREE ENTHALPY; INTERACTION RANGE; ISING MODEL; METASTABLE STATES; SPIN; STABILITY; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ANGULAR MOMENTUM; CRYSTAL MODELS; DISTANCE; ENERGY; ENERGY LEVELS; EXCITED STATES; MATHEMATICAL MODELS; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES