Electronic topological and structural transition in AuIn2 under pressure
Identifieur interne : 016389 ( Main/Repository ); précédent : 016388; suivant : 016390Electronic topological and structural transition in AuIn2 under pressure
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Abstract
Electrical resistivity, thermoelectric power, and high-pressure x-ray-diffraction measurements are carried out to investigate the anomaly observed earlier in fusion data around 3 GPa in the intermetallic compound AuIn2. While the imaging plate high-pressure angle-dispersive data indicate a structural phase transition beyond 8 GPa, the thermoelectric power shows a peak around 2 GPa, indicating the occurrence of an electronically driven isostructural transition. The first-principles linearized muffin-tin orbital calculations reveal that this transition is brought about by interception of the Fermi level by the energy-band maximum. The Lifshitz nature of this transition is responsible for the anomaly in the high-pressure electrical and fusion data.
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Jayaraman</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Hawaii Institute of Geophysics, 2525 Correa Road, Honolulu, Hawaii 96822</s1><sZ>2 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Hawaï</region></placeName><wicri:cityArea>Hawaii Institute of Geophysics, 2525 Correa Road, Honolulu</wicri:cityArea></affiliation></author><author><name sortKey="Meenakshi, S" uniqKey="Meenakshi S">S. Meenakshi</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India</s1><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">Inde</country><wicri:regionArea>High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, 400 085</wicri:regionArea><wicri:noRegion>400 085</wicri:noRegion></affiliation></author><author><name sortKey="Rao, R S" uniqKey="Rao R">R. S. Rao</name></author><author><name sortKey="Sikka, S K" uniqKey="Sikka S">S. K. 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B, Condensed matter</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Band structure</term><term>Electrical resistivity</term><term>Experimental study</term><term>Fermi level</term><term>Gold alloys</term><term>High-pressure solid-state phase transformations</term><term>Indium alloys</term><term>Muffin-tin potential</term><term>Theoretical study</term><term>Thermoelectric power</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>6250</term><term>6470K</term><term>7215E</term><term>7215J</term><term>Etude expérimentale</term><term>Etude théorique</term><term>Or alliage</term><term>Indium alliage</term><term>Transformation phase état solide haute pression</term><term>Résistivité électrique</term><term>Pouvoir thermoélectrique</term><term>Diffraction RX</term><term>Structure bande</term><term>Potentiel muffin tin</term><term>Niveau Fermi</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Electrical resistivity, thermoelectric power, and high-pressure x-ray-diffraction measurements are carried out to investigate the anomaly observed earlier in fusion data around 3 GPa in the intermetallic compound AuIn<sub>2</sub>. While the imaging plate high-pressure angle-dispersive data indicate a structural phase transition beyond 8 GPa, the thermoelectric power shows a peak around 2 GPa, indicating the occurrence of an electronically driven isostructural transition. The first-principles linearized muffin-tin orbital calculations reveal that this transition is brought about by interception of the Fermi level by the energy-band maximum. The Lifshitz nature of this transition is responsible for the anomaly in the high-pressure electrical and fusion data.</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>57</s2></fA05><fA06><s2>2</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Electronic topological and structural transition in AuIn<sub>2</sub> under pressure</s1></fA08><fA11 i1="01" i2="1"><s1>GODWAL (B. 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All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>98-0179707</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i2="1"><s0>Physical review. B, Condensed matter</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>Electrical resistivity, thermoelectric power, and high-pressure x-ray-diffraction measurements are carried out to investigate the anomaly observed earlier in fusion data around 3 GPa in the intermetallic compound AuIn<sub>2</sub>. While the imaging plate high-pressure angle-dispersive data indicate a structural phase transition beyond 8 GPa, the thermoelectric power shows a peak around 2 GPa, indicating the occurrence of an electronically driven isostructural transition. The first-principles linearized muffin-tin orbital calculations reveal that this transition is brought about by interception of the Fermi level by the energy-band maximum. 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