Phonon Raman scattering in A2Mn2O7 (A=Tl,In,Y)
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Abstract
Raman scattering of optical phonons in polycrystalline A2Mn2O7 (A=Y, In, and Tl) are reported as a function of temperature. For A=In and Tl a hardening of the two lowest energy modes is observed below Tc that we associate to a phonon modulation of the exchange interaction. These data suggest superexchange as the mechanism responsible for magnetic ordering in these systems. All but one of the Raman modes in the In- and Tl-based compounds appear at lower frequencies when compared with those in the Y-based one. This frequency shift may be due to the strong hybridization of the Tl(In) 6s(5s) orbital with O 2p and Mn 3d, claimed by recent band-structure calculations on these materials.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Phonon Raman scattering in A<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> (A=Tl,In,Y)</title><author><name sortKey="Granado, E" uniqKey="Granado E">E. Granado</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dupont Central Research and Development, Experimental Station, Wilmington, Delaware 19880</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Delaware</region></placeName><wicri:cityArea>Dupont Central Research and Development, Experimental Station, Wilmington</wicri:cityArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Lucent Technology, Bell Laboratories, Murray Hill, New Jersey 07974</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">New Jersey</region></placeName><wicri:cityArea>Lucent Technology, Bell Laboratories, Murray Hill</wicri:cityArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>San Diego State University, San Diego, California 92182</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Californie</region></placeName><wicri:cityArea>San Diego State University, San Diego</wicri:cityArea></affiliation></author><author><name sortKey="Pagliuso, P G" uniqKey="Pagliuso P">P. G. Pagliuso</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author><author><name sortKey="Sanjurjo, J A" uniqKey="Sanjurjo J">J. A. Sanjurjo</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author><author><name sortKey="Rettori, C" uniqKey="Rettori C">C. Rettori</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author><author><name sortKey="Subramanian, M A" uniqKey="Subramanian M">M. A. Subramanian</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author><author><name sortKey="Cheong, S W" uniqKey="Cheong S">S.-W Cheong</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author><author><name sortKey="Oseroff, S B" uniqKey="Oseroff S">S. B. Oseroff</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></inist:fA14><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP</wicri:regionArea><wicri:noRegion>Campinas-SP</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">99-0384754</idno><date when="1999-09-01">1999-09-01</date><idno type="stanalyst">PASCAL 99-0384754 AIP</idno><idno type="RBID">Pascal:99-0384754</idno><idno type="wicri:Area/Main/Corpus">014737</idno><idno type="wicri:Area/Main/Repository">013C18</idno></publicationStmt><seriesStmt><idno type="ISSN">0163-1829</idno><title level="j" type="abbreviated">Phys. rev., B, Condens. matter</title><title level="j" type="main">Physical review. B, Condensed matter</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Experimental study</term><term>Ferromagnetic materials</term><term>Indium compounds</term><term>Phonons</term><term>Raman spectra</term><term>Superexchange interactions</term><term>Thallium compounds</term><term>Theoretical study</term><term>Yttrium compounds</term><term>colossal magnetoresistance</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7830</term><term>6320</term><term>7530E</term><term>7130</term><term>Etude expérimentale</term><term>Etude théorique</term><term>Indium composé</term><term>Thallium composé</term><term>Yttrium composé</term><term>Spectre Raman</term><term>Phonon</term><term>Interaction superéchange</term><term>Matériau ferromagnétique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Raman scattering of optical phonons in polycrystalline A<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> (A=Y, In, and Tl) are reported as a function of temperature. For A=In and Tl a hardening of the two lowest energy modes is observed below T<sub>c</sub> that we associate to a phonon modulation of the exchange interaction. These data suggest superexchange as the mechanism responsible for magnetic ordering in these systems. All but one of the Raman modes in the In- and Tl-based compounds appear at lower frequencies when compared with those in the Y-based one. This frequency shift may be due to the strong hybridization of the Tl(In) 6s(5s) orbital with O 2p and Mn 3d, claimed by recent band-structure calculations on these materials.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0163-1829</s0></fA01><fA02 i1="01"><s0>PRBMDO</s0></fA02><fA03 i2="1"><s0>Phys. rev., B, Condens. matter</s0></fA03><fA05><s2>60</s2></fA05><fA06><s2>9</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Phonon Raman scattering in A<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> (A=Tl,In,Y)</s1></fA08><fA11 i1="01" i2="1"><s1>GRANADO (E.)</s1></fA11><fA11 i1="02" i2="1"><s1>PAGLIUSO (P. G.)</s1></fA11><fA11 i1="03" i2="1"><s1>SANJURJO (J. A.)</s1></fA11><fA11 i1="04" i2="1"><s1>RETTORI (C.)</s1></fA11><fA11 i1="05" i2="1"><s1>SUBRAMANIAN (M. A.)</s1></fA11><fA11 i1="06" i2="1"><s1>CHEONG (S.-W)</s1></fA11><fA11 i1="07" i2="1"><s1>OSEROFF (S. B.)</s1></fA11><fA14 i1="01"><s1>Instituto de Fisica Gleb Wataghin, UNICAMP, 13083-970, Campinas-SP, Brazil</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ><sZ>7 aut.</sZ></fA14><fA14 i1="02"><s1>Dupont Central Research and Development, Experimental Station, Wilmington, Delaware 19880</s1></fA14><fA14 i1="03"><s1>Lucent Technology, Bell Laboratories, Murray Hill, New Jersey 07974</s1></fA14><fA14 i1="04"><s1>San Diego State University, San Diego, California 92182</s1></fA14><fA20><s1>6513-6516</s1></fA20><fA21><s1>1999-09-01</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>© 1999 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>99-0384754</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Physical review. B, Condensed matter</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>Raman scattering of optical phonons in polycrystalline A<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> (A=Y, In, and Tl) are reported as a function of temperature. For A=In and Tl a hardening of the two lowest energy modes is observed below T<sub>c</sub> that we associate to a phonon modulation of the exchange interaction. These data suggest superexchange as the mechanism responsible for magnetic ordering in these systems. All but one of the Raman modes in the In- and Tl-based compounds appear at lower frequencies when compared with those in the Y-based one. This frequency shift may be due to the strong hybridization of the Tl(In) 6s(5s) orbital with O 2p and Mn 3d, claimed by recent band-structure calculations on these materials.</s0></fC01><fC02 i1="01" i2="3"><s0>001B70H30</s0></fC02><fC02 i1="02" i2="3"><s0>001B60C20</s0></fC02><fC02 i1="03" i2="3"><s0>001B70E30E</s0></fC02><fC02 i1="04" i2="3"><s0>001B70A30</s0></fC02><fC03 i1="01" i2="3" l="FRE"><s0>7830</s0><s2>PAC</s2><s4>INC</s4></fC03><fC03 i1="02" i2="3" l="FRE"><s0>6320</s0><s2>PAC</s2><s4>INC</s4></fC03><fC03 i1="03" i2="3" l="FRE"><s0>7530E</s0><s2>PAC</s2><s4>INC</s4></fC03><fC03 i1="04" i2="3" l="FRE"><s0>7130</s0><s2>PAC</s2><s4>INC</s4></fC03><fC03 i1="05" i2="3" l="FRE"><s0>Etude expérimentale</s0></fC03><fC03 i1="05" i2="3" l="ENG"><s0>Experimental study</s0></fC03><fC03 i1="06" i2="3" l="FRE"><s0>Etude théorique</s0></fC03><fC03 i1="06" i2="3" l="ENG"><s0>Theoretical study</s0></fC03><fC03 i1="07" i2="3" l="FRE"><s0>Indium composé</s0></fC03><fC03 i1="07" i2="3" l="ENG"><s0>Indium compounds</s0></fC03><fC03 i1="08" i2="3" l="FRE"><s0>Thallium composé</s0></fC03><fC03 i1="08" i2="3" l="ENG"><s0>Thallium compounds</s0></fC03><fC03 i1="09" i2="3" l="FRE"><s0>Yttrium composé</s0></fC03><fC03 i1="09" i2="3" l="ENG"><s0>Yttrium compounds</s0></fC03><fC03 i1="10" i2="3" l="FRE"><s0>Spectre Raman</s0></fC03><fC03 i1="10" i2="3" l="ENG"><s0>Raman spectra</s0></fC03><fC03 i1="11" i2="3" l="FRE"><s0>Phonon</s0></fC03><fC03 i1="11" i2="3" l="ENG"><s0>Phonons</s0></fC03><fC03 i1="12" i2="3" l="FRE"><s0>Interaction superéchange</s0></fC03><fC03 i1="12" i2="3" l="ENG"><s0>Superexchange interactions</s0></fC03><fC03 i1="13" i2="3" l="FRE"><s0>Matériau ferromagnétique</s0></fC03><fC03 i1="13" i2="3" l="ENG"><s0>Ferromagnetic materials</s0></fC03><fC03 i1="14" i2="3" l="ENG"><s0>colossal magnetoresistance</s0><s4>INC</s4></fC03><fN21><s1>242</s1></fN21><fN47 i1="01" i2="1"><s0>9933M000917</s0></fN47></pA></standard></inist></record>Pour manipuler ce document sous Unix (Dilib)
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