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

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dc.contributor.authorÖzüm, S
dc.contributor.authorAkkurt, T
dc.contributor.authorErdem, R
dc.contributor.authorGüçlü, N
dc.date.accessioned2026-03-31T13:21:15Z
dc.date.available2026-03-31T13:21:15Z
dc.date.issued2025
dc.description.abstractWe 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.
dc.identifier.doi10.5488/CMP.28.43703
dc.identifier.issn1607-324X
dc.identifier.issn2224-9079
dc.identifier.issue4
dc.identifier.urihttp://dx.doi.org/10.5488/CMP.28.43703
dc.identifier.urihttps://hdl.handle.net/11491/9646
dc.identifier.volume28
dc.identifier.wosWOS:001651073200011
dc.language.isoen
dc.publisherYukhnovskii INST CONDENSED MATTER PHYSICS NATL ACAD SCIENCES UKRAINE
dc.relation.ispartofCONDENS MATTER PHYS
dc.subjectmean and Gaussian curvatures
dc.subjectcurvedness
dc.subjectshape index
dc.subjectquantum lattice model
dc.subjectferroelectric crystals
dc.subjectphase transitions
dc.titleShape 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
dc.typeArticle

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