Order-parameter coupling in the improper ferroelectric lawsonite
Low-temperature specific heat and thermal expansion measurements are used to study the hydrogen-based ferroelectric lawsonite over the temperature range 1.8 K ≤ T ≤ 300 K. The second-order phase transition near 125 K is detected in the experiments, and the low-temperature phase is determined to be i...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2012-06, Vol.24 (25), p.255901-255901 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Salje, E K H Gofryk, K Safarik, D J Lashley, J C |
| description | Low-temperature specific heat and thermal expansion measurements are used to study the hydrogen-based ferroelectric lawsonite over the temperature range 1.8 K ≤ T ≤ 300 K. The second-order phase transition near 125 K is detected in the experiments, and the low-temperature phase is determined to be improper ferroelectric and co-elastic. In the ferroelectric phase T ≤ 125 K, the spontaneous polarization Ps is proportional to (1) the volume strain es, and (2) the excess entropy ΔSe. These proportionalities confirm the improper character of the ferroelectric phase transition. We develop a structural model that allows the off-centering of hydrogen positions to generate the spontaneous polarization. In the low-temperature limit we detect a Schottky anomaly (two-level system) with an energy gap of Δ ∼ 0.5 meV. |
| doi_str_mv | 10.1088/0953-8984/24/25/255901 |
| format | Article |
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The second-order phase transition near 125 K is detected in the experiments, and the low-temperature phase is determined to be improper ferroelectric and co-elastic. In the ferroelectric phase T ≤ 125 K, the spontaneous polarization Ps is proportional to (1) the volume strain es, and (2) the excess entropy ΔSe. These proportionalities confirm the improper character of the ferroelectric phase transition. We develop a structural model that allows the off-centering of hydrogen positions to generate the spontaneous polarization. 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Condensed matter</title><addtitle>JPhysCM</addtitle><addtitle>J. Phys.: Condens. Matter</addtitle><description>Low-temperature specific heat and thermal expansion measurements are used to study the hydrogen-based ferroelectric lawsonite over the temperature range 1.8 K ≤ T ≤ 300 K. The second-order phase transition near 125 K is detected in the experiments, and the low-temperature phase is determined to be improper ferroelectric and co-elastic. In the ferroelectric phase T ≤ 125 K, the spontaneous polarization Ps is proportional to (1) the volume strain es, and (2) the excess entropy ΔSe. These proportionalities confirm the improper character of the ferroelectric phase transition. We develop a structural model that allows the off-centering of hydrogen positions to generate the spontaneous polarization. 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Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Salje, E K H</au><au>Gofryk, K</au><au>Safarik, D J</au><au>Lashley, J C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Order-parameter coupling in the improper ferroelectric lawsonite</atitle><jtitle>Journal of physics. Condensed matter</jtitle><stitle>JPhysCM</stitle><addtitle>J. Phys.: Condens. Matter</addtitle><date>2012-06-27</date><risdate>2012</risdate><volume>24</volume><issue>25</issue><spage>255901</spage><epage>255901</epage><pages>255901-255901</pages><issn>0953-8984</issn><eissn>1361-648X</eissn><coden>JCOMEL</coden><abstract>Low-temperature specific heat and thermal expansion measurements are used to study the hydrogen-based ferroelectric lawsonite over the temperature range 1.8 K ≤ T ≤ 300 K. The second-order phase transition near 125 K is detected in the experiments, and the low-temperature phase is determined to be improper ferroelectric and co-elastic. In the ferroelectric phase T ≤ 125 K, the spontaneous polarization Ps is proportional to (1) the volume strain es, and (2) the excess entropy ΔSe. These proportionalities confirm the improper character of the ferroelectric phase transition. We develop a structural model that allows the off-centering of hydrogen positions to generate the spontaneous polarization. In the low-temperature limit we detect a Schottky anomaly (two-level system) with an energy gap of Δ ∼ 0.5 meV.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><pmid>22634712</pmid><doi>10.1088/0953-8984/24/25/255901</doi><tpages>6</tpages></addata></record> |
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| subjects | Condensed matter Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Deltas Dielectrics, piezoelectrics, and ferroelectrics and their properties Energy gap Exact sciences and technology Ferroelectric materials Ferroelectricity Ferroelectricity and antiferroelectricity Phase transformations Phase transitions and curie point Physics Polarization Spontaneous Thermal expansion thermomechanical effects and density Thermal properties of condensed matter Thermal properties of crystalline solids Thermodynamic properties |
| title | Order-parameter coupling in the improper ferroelectric lawsonite |
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