We introduce a lattice spin model where frustration is due to multibody interactions rather than quenched disorder in he Hamiltonian. The system has a crystalline ground state and below he melting temperature displays a dynamic behaviour typical of fragile glasses. However, the supercooled phase loses stability a an effective spinodal temperature, and hanks to his he Kauzmann paradox is resolved. Below he spinodal the system enters an off-equilibrium regime corresponding to fast crystal nucleation followed by slow activated crystal growth. In this phase and in a time region which is longer the lower the temperature we observe a violation of the fluctuation-dissipation theorem analogous to structural glasses. Moreover, we show hat in his system there is no qualitative difference between a locally stable glassy configuration and a highly disordered polycrystal.
Glassy dynamics, metastability limit and crystal growth in a lattice spin model / Cavagna, Andrea; Giardina, irene rosana; Grigera, Tomas S.. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 61:1(2003), pp. 74-80. [10.1209/epl/i2003-00247-9]
Glassy dynamics, metastability limit and crystal growth in a lattice spin model
GIARDINA, irene rosana;
2003
Abstract
We introduce a lattice spin model where frustration is due to multibody interactions rather than quenched disorder in he Hamiltonian. The system has a crystalline ground state and below he melting temperature displays a dynamic behaviour typical of fragile glasses. However, the supercooled phase loses stability a an effective spinodal temperature, and hanks to his he Kauzmann paradox is resolved. Below he spinodal the system enters an off-equilibrium regime corresponding to fast crystal nucleation followed by slow activated crystal growth. In this phase and in a time region which is longer the lower the temperature we observe a violation of the fluctuation-dissipation theorem analogous to structural glasses. Moreover, we show hat in his system there is no qualitative difference between a locally stable glassy configuration and a highly disordered polycrystal.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.