A discrete model of water with two distinct glassy phases
HuGeF Torino - Via Nizza 52, I-10126 Torino, Italy, EU
2 CMP Politecnico di Torino - Corso Duca degli Abruzzi 24, I-10129 Torino, Italy, EU
3 CNR-ISC and CNISM, Dipartimento di Fisica, Politecnico di Torino - Corso Duca degli Abruzzi 24, I-10129 Torino, Italy, EU
Accepted: 8 November 2010
We investigate a minimal model for non-crystalline water, defined on a Husimi lattice. The peculiar random-regular nature of the lattice is meant to account for the formation of a random 4-coordinated hydrogen-bond network. The model turns out to be consistent with most thermodynamic anomalies observed in liquid and supercooled-liquid water. Furthermore, the model exhibits two glassy phases with different densities, which can coexist at a first-order transition. The onset of a complex free-energy landscape, characterized by an exponentially large number of metastable minima, is pointed out by the cavity method, at the level of 1-step replica symmetry breaking.
PACS: 64.70.qd – Thermodynamics and statistical mechanics / 64.70.P- – Glass transitions of specific systems / 65.20.Jk – Studies of thermodynamic properties of specific liquids
© EPLA, 2010