Basal-plane Incommensurate Phases in HCP Structures

2); A. Jorio (2); Brazil); I. Luk'yanchuk (1; M. A. Pimenta (2) ((1) L.D.Landau Inst.for Theor.Phys; Moscow; (2) Dep.de Fisica; UFMG

arxiv: cond-mat/9711174 · v1 · submitted 1997-11-18 · ❄️ cond-mat.stat-mech

Basal-plane Incommensurate Phases in HCP Structures

I. Luk'yanchuk (1 , 2) , A. Jorio (2) , M. A. Pimenta (2) ((1) L.D.Landau Inst.for Theor.Phys , Moscow; (2) Dep.de Fisica , UFMG , Brazil) This is my paper

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keywords incommensuratephasephasesbasal-planecompoundsfamilyappearanceapplied

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An Ising model with competing interaction is used to study the appearance of incommensurate phases in the basal plane of an hexagonal closed-packed structure. The calculated mean-field phase diagram reveals various 1q-incommensurate and lock-in phases. The results are applied to explain the basal-plane incommensurate phase in some compounds of the A'A"BX_4 family, like K_2MoO_4, K_2WO_4, Rb_2WO4 and to describe the sequence of high-temperature phase transitions in other compounds of this family.

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Basal-plane Incommensurate Phases in HCP Structures

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