Behavior of the Lorenz Number in the Light Heavy-Fermion System YbInCu4
Identifieur interne : 000742 ( Russie/Analysis ); précédent : 000741; suivant : 000743Behavior of the Lorenz Number in the Light Heavy-Fermion System YbInCu4
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Abstract
The electrical resistivity and thermal conductivity of two polycrystalline YbInCu4 samples prepared by different techniques at the Ioffe Physicotechnical Institute, RAS (St. Petersburg, Russia), and the Goethe University (Frankfurt-am-Main, Germany) are studied within the temperature range 4.2-300 K. At Tv ∼ 75-78 K, these samples exhibited an isostructural phase transition from a state with an integer valence (at T > Tv ) to a state with an intermediate valence (at T < Tv) of the Yb ions. It is shown that at T < Tv ; i.e., in the temperature range where YbInCu4 is assumed to be a light heavy-fermion compound, the Lorenz number behaves as it should in a classical heavy-fermion system. At T > Tv , where YbInCu4 is a semimetal, the Lorenz number has a value characteristic of standard metals. © 2002 MAIK Nauka / Interperiodica .
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Politekhnicheskaya 26, St. Petersburg, 194021 Russia</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">Russie</country><wicri:regionArea>Ioffe Physicotechnical Institute, Russian Academy of Sciences, ul. Politekhnicheskaya 26, St. Petersburg</wicri:regionArea><wicri:noRegion>Ioffe Physicotechnical Institute, Russian Academy of Sciences, ul. Politekhnicheskaya 26, St. Petersburg, 194021 Russia</wicri:noRegion></affiliation></author><author><name sortKey="Misiorek, H" uniqKey="Misiorek H">H. Misiorek</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</s1><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country xml:lang="fr">Pologne</country><wicri:regionArea>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw</wicri:regionArea><wicri:noRegion>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</wicri:noRegion></affiliation></author><author><name sortKey="Mucha, J" uniqKey="Mucha J">J. Mucha</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</s1><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country xml:lang="fr">Pologne</country><wicri:regionArea>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw</wicri:regionArea><wicri:noRegion>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</wicri:noRegion></affiliation></author><author><name sortKey="Jezowski, A" uniqKey="Jezowski A">A. Jezowski</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</s1><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country xml:lang="fr">Pologne</country><wicri:regionArea>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw</wicri:regionArea><wicri:noRegion>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</wicri:noRegion></affiliation></author><author><name sortKey="Ritter, F" uniqKey="Ritter F">F. Ritter</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Goethe University, Frankfurt-am-Main, 60054 Germany</s1><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country xml:lang="fr">Allemagne</country><wicri:regionArea>Goethe University, Frankfurt-am-Main</wicri:regionArea><wicri:noRegion>60054 Germany</wicri:noRegion><wicri:noRegion>Goethe University, Frankfurt-am-Main, 60054 Germany</wicri:noRegion></affiliation></author><author><name sortKey="Assmus, W" uniqKey="Assmus W">W. Assmus</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Goethe University, Frankfurt-am-Main, 60054 Germany</s1><sZ>7 aut.</sZ><sZ>8 aut.</sZ></inist:fA14><country xml:lang="fr">Allemagne</country><wicri:regionArea>Goethe University, Frankfurt-am-Main</wicri:regionArea><wicri:noRegion>60054 Germany</wicri:noRegion><wicri:noRegion>Goethe University, Frankfurt-am-Main, 60054 Germany</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="inist">02-0302995</idno><date when="2002-06">2002-06</date><idno type="stanalyst">PASCAL 02-0302995 AIP</idno><idno type="RBID">Pascal:02-0302995</idno><idno type="wicri:Area/Main/Corpus">00F235</idno><idno type="wicri:Area/Main/Repository">00E174</idno><idno type="wicri:Area/Russie/Extraction">000742</idno></publicationStmt><seriesStmt><idno type="ISSN">1063-7834</idno><title level="j" type="abbreviated">Phys. solid state</title><title level="j" type="main">Physics of the solid state</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Copper compounds</term><term>Electric resistivity</term><term>Electrical conductivity transitions</term><term>Experimental study</term><term>Heavy fermion systems</term><term>Indium compounds</term><term>Mixed-valence compounds</term><term>Solid-state phase transformations</term><term>Thermal conductivity</term><term>Ytterbium compounds</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7127</term><term>7128</term><term>7260</term><term>7215E</term><term>Etude expérimentale</term><term>Système fermions lourds</term><term>Composé valence mixte</term><term>Résistivité électrique</term><term>Conductivité thermique</term><term>Transformation phase état solide</term><term>Transition conductivité électrique</term><term>Ytterbium composé</term><term>Indium composé</term><term>Cuivre composé</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The electrical resistivity and thermal conductivity of two polycrystalline YbInCu<sub>4</sub> samples prepared by different techniques at the Ioffe Physicotechnical Institute, RAS (St. Petersburg, Russia), and the Goethe University (Frankfurt-am-Main, Germany) are studied within the temperature range 4.2-300 K. At T<sub>v</sub> ∼ 75-78 K, these samples exhibited an isostructural phase transition from a state with an integer valence (at T > T<sub>v</sub> ) to a state with an intermediate valence (at T < T<sub>v</sub>) of the Yb ions. It is shown that at T < T<sub>v</sub> ; i.e., in the temperature range where YbInCu<sub>4</sub> is assumed to be a light heavy-fermion compound, the Lorenz number behaves as it should in a classical heavy-fermion system. At T > T<sub>v</sub> , where YbInCu<sub>4</sub> is a semimetal, the Lorenz number has a value characteristic of standard metals. © 2002 MAIK Nauka / Interperiodica .</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1063-7834</s0></fA01><fA02 i1="01"><s0>PSOSED</s0></fA02><fA03 i2="1"><s0>Phys. solid state</s0></fA03><fA05><s2>44</s2></fA05><fA06><s2>6</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Behavior of the Lorenz Number in the Light Heavy-Fermion System YbInCu<sub>4</sub></s1></fA08><fA11 i1="01" i2="1"><s1>GOLUBKOV (A. V.)</s1></fA11><fA11 i1="02" i2="1"><s1>PARFENEVA (L. S.)</s1></fA11><fA11 i1="03" i2="1"><s1>SMIRNOV (I. A.)</s1></fA11><fA11 i1="04" i2="1"><s1>MISIOREK (H.)</s1></fA11><fA11 i1="05" i2="1"><s1>MUCHA (J.)</s1></fA11><fA11 i1="06" i2="1"><s1>JEZOWSKI (A.)</s1></fA11><fA11 i1="07" i2="1"><s1>RITTER (F.)</s1></fA11><fA11 i1="08" i2="1"><s1>ASSMUS (W.)</s1></fA11><fA14 i1="01"><s1>Ioffe Physicotechnical Institute, Russian Academy of Sciences, ul. Politekhnicheskaya 26, St. Petersburg, 194021 Russia</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Institute of Low-Temperature and Structural Research, Polish Academy of Sciences, Wroclaw, 50-950 Poland</s1><sZ>4 aut.</sZ><sZ>5 aut.</sZ><sZ>6 aut.</sZ></fA14><fA14 i1="03"><s1>Goethe University, Frankfurt-am-Main, 60054 Germany</s1><sZ>7 aut.</sZ><sZ>8 aut.</sZ></fA14><fA20><s1>1016-1021</s1></fA20><fA21><s1>2002-06</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>1185</s2></fA43><fA44><s0>8100</s0><s1>© 2002 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>02-0302995</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Physics of the solid state</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>The electrical resistivity and thermal conductivity of two polycrystalline YbInCu<sub>4</sub> samples prepared by different techniques at the Ioffe Physicotechnical Institute, RAS (St. Petersburg, Russia), and the Goethe University (Frankfurt-am-Main, Germany) are studied within the temperature range 4.2-300 K. At T<sub>v</sub> ∼ 75-78 K, these samples exhibited an isostructural phase transition from a state with an integer valence (at T > T<sub>v</sub> ) to a state with an intermediate valence (at T < T<sub>v</sub>) of the Yb ions. It is shown that at T < T<sub>v</sub> ; i.e., in the temperature range where YbInCu<sub>4</sub> is assumed to be a light heavy-fermion compound, the Lorenz number behaves as it should in a classical heavy-fermion system. 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