Shape descriptors of equilibrium states in a quantum lattice model with local multi-well potentials: A geometric analysis near the phase transitions in Sn2P2S6 ferroelectric crystals
[ X ]
Tarih
2025
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Yukhnovskii INST CONDENSED MATTER PHYSICS NATL ACAD SCIENCES UKRAINE
Erişim Hakkı
Özet
We analyze the equilibrium states of quantum lattice model with local multi-well potentials for Sn2P2S6 ferroelectric crystals using the mean and Gaussian curvatures (H, K), curvedness (C) and shape index (S). From the energy gap, pressure and temperature variations of H, K, C and S, we have reported the geometric construction of the free energy surfaces for the ferroelectric and paraelectric phases. Their behaviors are explicitly observed near the ferroelectric-paraelectric phase transitions. It is found that H, C and S display a cusp singularity at the criticality while K converges to zero on both sides of the critical and tricritical points.
Açıklama
Anahtar Kelimeler
mean and Gaussian curvatures, curvedness, shape index, quantum lattice model, ferroelectric crystals, phase transitions
Kaynak
CONDENS MATTER PHYS
WoS Q Değeri
Scopus Q Değeri
Cilt
28
Sayı
4
