In search of a tricritical Lifshitz point in Sn2P2(S1-xSex)6 doped with Pb, Ge: A critical behavior study

Oleaga, A.; Shvalya, Vasyl; Salazar, A.; Стойка, І. М.; Vysochanskiǐ, Yu. M.

doi:10.1016/j.jallcom.2016.10.071

Cited by 12 publications

(18 citation statements)

References 43 publications

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“…Thermal diffusivity has been obtained as a function of temperature from room temperature down to 30 K, paying special attention to the region around the magnetic transitions. This technique is very well suited to study the critical behavior in phase transitions and has been successfully applied to solid and liquid crystals (magnetic as well as ferroelectric transitions), including other intermetallic materials [19,[27][28][29][30][31][32][33][34][35], as it combines very low temperature rates (down to 5-10 mK/min) with a high sensitivity. The details of the experimental setup, as well as of the theory explaining how to extract the thermal diffusivity from the photopyroelectric signal, can be found elsewhere [29,36].…”

Section: Samples and Experimental Techniquesmentioning

confidence: 99%

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

et al. 2019

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A comprehensive study of the magnetic phase transitions in Tb 3 Co has been undertaken combining different techniques. Using single crystal neutron diffraction in the paramagnetic state a weak crystal structure distortion from the room temperature orthorhombic structure of the Fe 3 C type described with the Pnma space group toward structure with lower symmetry has been observed with cooling below 100 K. At 81 K there is a second order phase transition to an antiferromagnetic incommensurate phase with the propagation vector k = (0.155, 0, 0). As derived from thermal diffusivity measurements, the critical exponents for this transition are very close to the 3D-Heisenberg universality class, proving that the magnetic interactions are short-range but with a deviation from perfect isotropy due to crystal field effects. At T 2  70 K there is another magnetic phase transition to a ferromagnetic state whose character is shown to be weakly first order. The low temperature magnetic state has a non-coplanar ferromagnetic structure with strong ferromagnetic components of Tb magnetic moments along the crystallographic c-axis. The application of an external magnetic field B = 2 T along the

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Section: Samples and Experimental Techniquesmentioning

confidence: 99%

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

et al. 2019

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“…The experimental data were simultaneously fitted for T > T C and T < T C with a non-linear least square routine using a Levenberg-Marquardt method. The details of the fitting procedure can be found in [34,35].…”

Section: Critical Behavior: Fittings and Discussionmentioning

confidence: 99%

Critical behavior study of the spin ordering transition in RVO3 (R = Ce, Pr, Nd, Sm, Gd, Er) by means of ac photopyroelectric calorimetry

Oleaga

Shvalya

Liubachko

et al. 2017

Journal of Alloys and Compounds

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(2017) Critical behavior study of the spin ordering transition in RVO3 (R = Ce, Pr, Nd, Sm, Gd, Er) by means of ac photopyroelectric calorimetry. Journal of Alloys and Compounds,. Permanent WRAP URL:http://wrap.warwick.ac.uk/89192 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.

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“…The 16,17,[32][33][34] Thermal conductivity k has been retrieved by combining the experimental thermal diffusivity D and the calculated background heat capacity c for Sn 2 P 2 S 6 , Pb 2 P 2 S 6 and the experimental one for Sn 2 P 2 Se 6 , Pb 2 P 2 Se 6 . 35,36 The detailed procedure to obtain the thermal conductivity is explained elsewhere.…”

Section: Experimental Datamentioning

confidence: 99%

“…1,16 For Sn 2 P 2 (Se x S 1−x ) 6 solutions, both S by Se and Sn by Ge replacements increase the crystal lattice covalence, and the critical anomaly near the LP becomes sharper. 17 In the case of the binary compounds GeS, SnS, PbS or GeS, GeSe, GeTe, it was demonstrated that it is mostly the energy difference between s orbitals of metal atoms and p orbital of chalcogen atoms which determines the stereoactivity of the cations and the crystal lattice covalency. 18 For ternary compounds, for example BiNiO 3 , it was demonstrated 19 that the energy positions of the valence orbitals of the two cations Bi 4+ and Ni 2+ are also important.…”

Section: Introductionmentioning

confidence: 99%

Quantum paraelectric state and critical behavior in Sn(Pb)$_2$P$_2$S(Se)$_6$ ferroelectrics

Zamaraite,

Liubachko,

Yevych

et al. 2020

Preprint

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The dipole ordering in Sn(Pb)2P2S(Se)6 materials may be tuned by chemical substitution realizing a ferroelectric quantum phase transition and quantum glassy or relaxor type phenomena on different parts of the phase diagram. The introduction of Ge impurity increases the temperature of the phase transitions and initiates a more pronounced Ising type critical anomaly in Sn2P2S6 crystal, does not shift the coordinate of the Lifshitz point xLP in Sn2P2(SexS1−x)6 mixed crystals, induces the appearance of a ferroelectric phase transition in quantum paraelectrics Pb2P2S6 and inhomogeneous polar ordering in (Pb0.7Sn0.3)2P2S(Se)6 crystals. For Pb2P2S6 crystal, the real part of the dielectric susceptibility in the quantum critical regime varies as 1/T 2 instead of the expected 1/T 3 behavior for uniaxial materials. This can be partially explained by a screening phenomenon in the semiconductor materials of the Sn(Pb)2P2S(Se)6 system, which weakens the long range electric dipole interactions, and also provides, at high temperatures, a critical behavior near the Lifshitz point (studied by thermal diffusivity) similar to the one predicted in the case of systems with short range interactions. At low temperatures, a quantum critical behavior in Pb2P2S6 crystal can be established by the nonlinear coupling between polar and antipolar fluctuations. An increase in thermal conductivity is induced by Ge impurity in Pb2P2S6 crystal, which is explained through the weakening of the acoustic phonons resonance scattering by soft optic phonons because of the appearance of ferroelectric phase polar clusters.

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In search of a tricritical Lifshitz point in Sn2P2(S1-xSex)6 doped with Pb, Ge: A critical behavior study

Cited by 12 publications

References 43 publications

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

Comprehensive study of the magnetic phase transitions in Tb3Co combining thermal, magnetic and neutron diffraction measurements

Critical behavior study of the spin ordering transition in RVO3 (R = Ce, Pr, Nd, Sm, Gd, Er) by means of ac photopyroelectric calorimetry

Quantum paraelectric state and critical behavior in Sn(Pb)$_2$P$_2$S(Se)$_6$ ferroelectrics

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