Antiphase structures of an improper ferroelastic phase transition driven by an M5- zone boundary phonon in RAg1-xInx
Identifieur interne : 00FF93 ( Main/Repository ); précédent : 00FF92; suivant : 00FF94Antiphase structures of an improper ferroelastic phase transition driven by an M5- zone boundary phonon in RAg1-xInx
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Abstract
Rare-earth alloys RAg1-xInx (where R=La, Ce, and Pr) are improper ferroelastic materials with the CsCl structure. A weakly first-order phase transition occurs with the softening of a zone-edge M5- mode that drives the material from a cubic phase to a tetragonal phase. Based on Ginzburg-Landau theory, we utilize the complete free-energy density, constructed from a six-dimensional primary order parameter (shuffle) that couples to strain, to study domain formation. The model allows the study of complex antiphase structures that appear in this cubic-to-tetragonal phase transition. With the help of numerical techniques, the order-parameter profiles across antiphase boundaries of different orientations and their temperature dependence are calculated. We find a single set of two coupled dimensionless governing equations, which are applicable to order-parameter profiles across all antiphase boundaries for this transition.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Antiphase structures of an improper ferroelastic phase transition driven by an M<sub>5</sub><sup>-</sup> zone boundary phonon in RAg<sub>1-x</sub>In<sub>x</sub></title><author><name sortKey="Cao, Wenwu" uniqKey="Cao W">Wenwu Cao</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802</s1><sZ>1 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Pennsylvanie</region></placeName><wicri:cityArea>Materials Research Laboratory, The Pennsylvania State University, University Park</wicri:cityArea></affiliation></author><author><name sortKey="Saxena, Avadh" uniqKey="Saxena A">Avadh Saxena</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545</s1><sZ>2 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Nouveau-Mexique</region></placeName><wicri:cityArea>Theoretical Division, Los Alamos National Laboratory, Los Alamos</wicri:cityArea></affiliation></author><author><name sortKey="Hatch, Dorian M" uniqKey="Hatch D">Dorian M. Hatch</name><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Department of Physics, Brigham Young University, Provo, Utah 84602</s1><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Utah</region></placeName><wicri:cityArea>Department of Physics, Brigham Young University, Provo</wicri:cityArea></affiliation></author></titleStmt><publicationStmt><idno type="inist">01-0272642</idno><date when="2001-07-01">2001-07-01</date><idno type="stanalyst">PASCAL 01-0272642 AIP</idno><idno type="RBID">Pascal:01-0272642</idno><idno type="wicri:Area/Main/Corpus">011028</idno><idno type="wicri:Area/Main/Repository">00FF93</idno></publicationStmt><seriesStmt><idno type="ISSN">1098-0121</idno><title level="j" type="abbreviated">Phys. rev., B, Condens. matter mater. phys.</title><title level="j" type="main">Physical review. B, Condensed matter and materials physics</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anti-phase boundaries</term><term>Cerium alloys</term><term>Experimental study</term><term>Ferroelastic transitions</term><term>Free energy</term><term>Ginzburg-Landau theory</term><term>Indium alloys</term><term>Lanthanum alloys</term><term>Phonons</term><term>Praseodymium alloys</term><term>Silver alloys</term><term>Theoretical study</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>6470K</term><term>0220</term><term>6150A</term><term>6150K</term><term>Etude théorique</term><term>Etude expérimentale</term><term>Lanthane alliage</term><term>Cérium alliage</term><term>Praséodyme alliage</term><term>Argent alliage</term><term>Indium alliage</term><term>Transition ferroélastique</term><term>Phonon</term><term>Théorie Ginzburg Landau</term><term>Joint antiphase</term><term>Energie libre</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Rare-earth alloys RAg<sub>1-x</sub>In<sub>x</sub> (where R=La, Ce, and Pr) are improper ferroelastic materials with the CsCl structure. A weakly first-order phase transition occurs with the softening of a zone-edge M<sub>5</sub><sup>-</sup> mode that drives the material from a cubic phase to a tetragonal phase. Based on Ginzburg-Landau theory, we utilize the complete free-energy density, constructed from a six-dimensional primary order parameter (shuffle) that couples to strain, to study domain formation. The model allows the study of complex antiphase structures that appear in this cubic-to-tetragonal phase transition. With the help of numerical techniques, the order-parameter profiles across antiphase boundaries of different orientations and their temperature dependence are calculated. We find a single set of two coupled dimensionless governing equations, which are applicable to order-parameter profiles across all antiphase boundaries for this transition.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1098-0121</s0></fA01><fA02 i1="01"><s0>PRBMDO</s0></fA02><fA03 i2="1"><s0>Phys. rev., B, Condens. matter mater. phys.</s0></fA03><fA05><s2>64</s2></fA05><fA06><s2>2</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Antiphase structures of an improper ferroelastic phase transition driven by an M<sub>5</sub><sup>-</sup> zone boundary phonon in RAg<sub>1-x</sub>In<sub>x</sub></s1></fA08><fA11 i1="01" i2="1"><s1>CAO (Wenwu)</s1></fA11><fA11 i1="02" i2="1"><s1>SAXENA (Avadh)</s1></fA11><fA11 i1="03" i2="1"><s1>HATCH (Dorian M.)</s1></fA11><fA14 i1="01"><s1>Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802</s1><sZ>1 aut.</sZ></fA14><fA14 i1="02"><s1>Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545</s1><sZ>2 aut.</sZ></fA14><fA14 i1="03"><s1>Department of Physics, Brigham Young University, Provo, Utah 84602</s1><sZ>3 aut.</sZ></fA14><fA20><s2>024106-024106-12</s2></fA20><fA21><s1>2001-07-01</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>144 B</s2></fA43><fA44><s0>8100</s0><s1>© 2001 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>01-0272642</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Physical review. B, Condensed matter and materials physics</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>Rare-earth alloys RAg<sub>1-x</sub>In<sub>x</sub> (where R=La, Ce, and Pr) are improper ferroelastic materials with the CsCl structure. A weakly first-order phase transition occurs with the softening of a zone-edge M<sub>5</sub><sup>-</sup> mode that drives the material from a cubic phase to a tetragonal phase. Based on Ginzburg-Landau theory, we utilize the complete free-energy density, constructed from a six-dimensional primary order parameter (shuffle) that couples to strain, to study domain formation. The model allows the study of complex antiphase structures that appear in this cubic-to-tetragonal phase transition. With the help of numerical techniques, the order-parameter profiles across antiphase boundaries of different orientations and their temperature dependence are calculated. 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