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Andersson, Ove; Чобаль, Олександр Ілліч; Rizak, I. M.; Різак, В. М.

doi:10.1103/physrevb.80.174107

Cited by 24 publications

(9 citation statements)

References 16 publications

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“…25 However, several conflicting statements were reported about the nature of the high-pressure phase transition of Sn 2 P 2 S 6 . In particular, recent analysis of the specific heat anomalies 26 supports the earlier guess 27 that the conditions for the LP are met at lower pressure than the conditions for the TCP. This means that only the LP is realized in the pressuretemperature phase diagram of Sn 2 P 2 S 6 .…”

Section: Introductionmentioning

confidence: 70%

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Neutron scattering study of ferroelectric Sn2P2S6under pressure

et al. 2012

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Ferroelectric phase transition in the semiconductor Sn 2 P 2 S 6 single crystal has been studied by means of neutron scattering in the pressure-temperature range adjacent to the anticipated tricritical Lifshitz point (p ≈ 0.18 GPa, T ≈ 296 K). The observations reveal a direct ferroelectric-paraelectric phase transition in the whole investigated pressure range (0.18-0.6 GPa). These results are in a clear disagreement with phase diagrams assumed in numerous earlier works, according to which a hypothetical intermediate incommensurate phase extends over several or even tens of degrees in the 0.5 GPa pressure range. Temperature dependence of the anisotropic quasielastic diffuse scattering suggests that polarization fluctuations present above T C are strongly reduced in the ordered phase. Still, the temperature dependence of the (200) Bragg reflection intensity at p = 0.18 GPa can be remarkably well modeled assuming the order-parameter amplitude growth according to the power law with logarithmic corrections predicted for a uniaxial ferroelectric transition at the tricritical Lifshitz point.

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Section: Introductionmentioning

confidence: 70%

“…35 On the top of that, there is a considerable disagreement about the domain of stability of the high-pressure intermediate phase of Sn 2 P 2 S 6 among various sources. 26,28,36,37 FIG. 1.…”

Section: Introductionmentioning

confidence: 99%

Neutron scattering study of ferroelectric Sn2P2S6under pressure

et al. 2012

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Section: Introductionmentioning

confidence: 59%

Neutron scattering study of ferroelectric Sn2P2S6 under pressure

Ondrejkovic,

Kempa,

Vysochanskii

et al. 2012

Preprint

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Ferroelectric phase transition in the semiconductor Sn2P2S6 single crystal has been studied by means of neutron scattering in the pressure-temperature range adjacent to the anticipated tricritical Lifshitz point (p ≈ 0.18 GPa, T ≈ 296 K). The observations reveal a direct ferroelectric-paraelectric phase transition in the whole investigated pressure range (0.18 − 0.6 GPa). These results are in a clear disagreement with phase diagrams assumed in numerous earlier works, according to which a hypothetical intermediate incommensurate phase extends over several or even tens of degrees in the 0.5 GPa pressure range. Temperature dependence of the anisotropic quasielastic diffuse scattering suggests that polarization fluctuations present above TC are strongly reduced in the ordered phase. Still, the temperature dependence of the ( 200) Bragg reflection intensity at p = 0.18 GPa can be remarkably well modeled assuming the order-parameter amplitude growth according to the power law with logarithmic corrections predicted for a uniaxial ferroelectric transition at the tricritical Lifshitz point.

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“…The transition is accompanied by the point symmetry group change 2 / m F m and by appearance of spontaneous electric polarisation, which is almost parallel to the crystallographic axis a . Many authors have noticed that the phase transition in Sn 2 P 2 S 6 is close to a number of specific polycritical points on the (x, T)-phase diagram of Sn 2 P 2 (Se x S 1-x ) 6 solid solutions, namely a tricritical point (see, e.g., the recent work [2][3][4][5]), a Lifshitz point [1,3,6], or a tricritical Liftshitz point [7]. The results of our recent work [5] have testified that, at x = 0.28, the tricritical point should occur on the (x, T)-phase diagram of Sn 2 P 2 (Se x S 1-x ) 6 rather than the Lifshitz one, whereas the triple point characterised by the appearance of incommensurately modulated phase should occur at some higher concentrations of selenium (e.g., at 0.4 x  ).…”

Section: Introductionmentioning

confidence: 99%

On the critical exponent of order parameter in Sn2P2S6 and Sn2P2(Se0.28S0.72)6 crystals

Vasylkiv¹,

Mys²,

Zapeka³

et al. 2012

Ukr. J. Phys. Opt.

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Abstract. We have determined critical exponents of the order parameter in ferroelectric Sn 2 P 2 S 6 and Sn 2 P 2 (Se 0.28 S 0.72 ) 6 crystals at the atmospheric pressure. They are equal to 0.29 0.02  for Sn 2 P 2 S 6 and 0.24 0.02  for Sn 2 P 2 (Se 0.28 S 0.72 ) 6 . These value suggest that, with changing selenium concentration from x = 0 up to x = 0.28, the solid solutions Sn 2 P 2 (Se x S 1-x ) 6 approach the conditions of tricritical point, which is realised in the vicinity of x = 0.28. The conclusion agrees well with the results of our recent works derived with the other techniques.

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Tricritical Lifshitz point in the temperature-pressure-composition diagram for(PbySn1−y)2

Cited by 24 publications

References 16 publications

Neutron scattering study of ferroelectric Sn2P2S6under pressure

Neutron scattering study of ferroelectric Sn2P2S6under pressure

Neutron scattering study of ferroelectric Sn2P2S6 under pressure

On the critical exponent of order parameter in Sn2P2S6 and Sn2P2(Se0.28S0.72)6 crystals

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