Transition to electron doping in La1-xCaxMnO3 manganite system: Size-induced effects on magnetic order, probed by electron resonance technique
Identifieur interne : 002227 ( Main/Repository ); précédent : 002226; suivant : 002228Transition to electron doping in La1-xCaxMnO3 manganite system: Size-induced effects on magnetic order, probed by electron resonance technique
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Abstract
The X-band electron magnetic resonance was measured on nano-sized half-doped La0.5Ca0.5MnO3 and electron-doped La0.4Ca0.6MnO3 manganite compounds at 5-600 K temperature range. The electron paramagnetic resonance parameters were fitted with known theoretical models. The low temperature ferromagnetic resonance data were analyzed together with the results of neutron diffraction and magnetic measurements. The size effects in half-doped and electron-doped nano-powders are strongly different. A suppression of bulk-like antiferromagnetic/charge ordered component and stabilization of frustrated ferromagnetic-like (FM) order were found for Ca0.5 series, in which the core-shell interaction and a spin disorder at the surfaces weaken upon increase in grain size. However, well pronounced FM spin correlations in the paramagnetic state of Ca0.6 nano-crystals have not induced the FM long-range ordering. The local nature of double exchange coupling and the resulting localization of carriers in electron-doped compounds seem to be responsible for this effect.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Transition to electron doping in La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> manganite system: Size-induced effects on magnetic order, probed by electron resonance technique</title><author><name sortKey="Shames, A I" uniqKey="Shames A">A. I. Shames</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>84105 Be'er-Sheva</wicri:noRegion></affiliation></author><author><name sortKey="Rozenberg, E" uniqKey="Rozenberg E">E. Rozenberg</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>84105 Be'er-Sheva</wicri:noRegion></affiliation></author><author><name sortKey="Auslender, M" uniqKey="Auslender M">M. Auslender</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Electrical Engineering and Computers, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>3 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>84105 Be'er-Sheva</wicri:noRegion></affiliation></author><author><name sortKey="Mogilyansky, D" uniqKey="Mogilyansky D">D. Mogilyansky</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>84105 Be'er-Sheva</wicri:noRegion></affiliation></author><author><name sortKey="Sominski, E" uniqKey="Sominski E">E. Sominski</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Chemistry and Center for Advanced Materials and Nanotechnology, Bar-Ilan University</s1><s2>52900 Ramat-Gan</s2><s3>ISR</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>52900 Ramat-Gan</wicri:noRegion></affiliation></author><author><name sortKey="Gedanken, A" uniqKey="Gedanken A">A. Gedanken</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Chemistry and Center for Advanced Materials and Nanotechnology, Bar-Ilan University</s1><s2>52900 Ramat-Gan</s2><s3>ISR</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Israël</country><wicri:noRegion>52900 Ramat-Gan</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">11-0455683</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 11-0455683 INIST</idno><idno type="RBID">Pascal:11-0455683</idno><idno type="wicri:Area/Main/Corpus">002740</idno><idno type="wicri:Area/Main/Repository">002227</idno></publicationStmt><seriesStmt><idno type="ISSN">0038-1098</idno><title level="j" type="abbreviated">Solid state commun.</title><title level="j" type="main">Solid state communications</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Antiferromagnetism</term><term>Carrier density</term><term>Doping</term><term>Double exchange</term><term>Electron localization</term><term>Electron paramagnetic resonance</term><term>Ferromagnetic resonance</term><term>Ferromagnetism</term><term>Indium additions</term><term>Magnetic ordering</term><term>Manganites</term><term>Nanopowder</term><term>Neutron diffraction</term><term>Size effect</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Addition indium</term><term>Effet dimensionnel</term><term>Ordre magnétique</term><term>Double échange</term><term>Densité porteur charge</term><term>Dopage</term><term>Résonance paramagnétique éléctronique</term><term>Résonance ferromagnétique</term><term>Diffraction neutron</term><term>Localisation électronique</term><term>Antiferromagnétisme</term><term>Ferromagnétisme</term><term>Manganite</term><term>Nanopoudre</term></keywords><keywords scheme="Wicri" type="concept" xml:lang="fr"><term>Dopage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The X-band electron magnetic resonance was measured on nano-sized half-doped La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> and electron-doped La<sub>0.4</sub>Ca<sub>0.6</sub>MnO<sub>3</sub> manganite compounds at 5-600 K temperature range. The electron paramagnetic resonance parameters were fitted with known theoretical models. The low temperature ferromagnetic resonance data were analyzed together with the results of neutron diffraction and magnetic measurements. The size effects in half-doped and electron-doped nano-powders are strongly different. A suppression of bulk-like antiferromagnetic/charge ordered component and stabilization of frustrated ferromagnetic-like (FM) order were found for Ca0.5 series, in which the core-shell interaction and a spin disorder at the surfaces weaken upon increase in grain size. However, well pronounced FM spin correlations in the paramagnetic state of Ca0.6 nano-crystals have not induced the FM long-range ordering. The local nature of double exchange coupling and the resulting localization of carriers in electron-doped compounds seem to be responsible for this effect.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0038-1098</s0></fA01><fA02 i1="01"><s0>SSCOA4</s0></fA02><fA03 i2="1"><s0>Solid state commun.</s0></fA03><fA05><s2>151</s2></fA05><fA06><s2>21</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Transition to electron doping in La<sub>1-x</sub>Ca<sub>x</sub>MnO<sub>3</sub> manganite system: Size-induced effects on magnetic order, probed by electron resonance technique</s1></fA08><fA11 i1="01" i2="1"><s1>SHAMES (A. I.)</s1></fA11><fA11 i1="02" i2="1"><s1>ROZENBERG (E.)</s1></fA11><fA11 i1="03" i2="1"><s1>AUSLENDER (M.)</s1></fA11><fA11 i1="04" i2="1"><s1>MOGILYANSKY (D.)</s1></fA11><fA11 i1="05" i2="1"><s1>SOMINSKI (E.)</s1></fA11><fA11 i1="06" i2="1"><s1>GEDANKEN (A.)</s1></fA11><fA14 i1="01"><s1>Department of Physics, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Electrical Engineering and Computers, Ben-Gurion University of the Negev, P.O. Box 653</s1><s2>84105 Be'er-Sheva</s2><s3>ISR</s3><sZ>3 aut.</sZ></fA14><fA14 i1="03"><s1>Department of Chemistry and Center for Advanced Materials and Nanotechnology, Bar-Ilan University</s1><s2>52900 Ramat-Gan</s2><s3>ISR</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></fA14><fA20><s1>1593-1598</s1></fA20><fA21><s1>2011</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>10917</s2><s5>354000509976760200</s5></fA43><fA44><s0>0000</s0><s1>© 2011 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>32 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>11-0455683</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Solid state communications</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>The X-band electron magnetic resonance was measured on nano-sized half-doped La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> and electron-doped La<sub>0.4</sub>Ca<sub>0.6</sub>MnO<sub>3</sub> manganite compounds at 5-600 K temperature range. The electron paramagnetic resonance parameters were fitted with known theoretical models. The low temperature ferromagnetic resonance data were analyzed together with the results of neutron diffraction and magnetic measurements. The size effects in half-doped and electron-doped nano-powders are strongly different. A suppression of bulk-like antiferromagnetic/charge ordered component and stabilization of frustrated ferromagnetic-like (FM) order were found for Ca0.5 series, in which the core-shell interaction and a spin disorder at the surfaces weaken upon increase in grain size. However, well pronounced FM spin correlations in the paramagnetic state of Ca0.6 nano-crystals have not induced the FM long-range ordering. 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