ThuliumV1, Main, Exploration, bibRecord, 002B02

Insulator-superconductor transition in Tm0.4Pr0.6Ba2Cu3O7 by iso-valent substitution at Ba site

Identifieur interne : 002B02 ( Main/Exploration ); précédent : 002B01; suivant : 002B03

Insulator-superconductor transition in Tm0.4Pr0.6Ba2Cu3O7 by iso-valent substitution at Ba site

Auteurs : L. Colonescu [France] ; J. Berthon [France] ; R. Suryanarayanan [France]

Source :

Solid state communications [ 0038-1098 ] ; 1997.

RBID : Pascal:98-0023034

Descripteurs français

Pascal (Inist)
- Transition supraconductrice, Hybridation, Supraconductivité, Composition chimique, Transformation phase cristalline, Réseau orthorhombique, Réseau quadratique, Recuit, Atmosphère contrôlée, Orbitale, Diffraction RX, Transition métal isolant, Paramètre cristallin, Polycristal, Thulium oxyde, Praséodyme oxyde, Baryum oxyde, Strontium oxyde, Etude expérimentale, 7462B, 7425J, 7472Y, Cuivre oxyde, Composé n éléments, Tm0,4Pr0,6Ba2-kSrkcu3o6+z, Ba Cu O Pr Sr Tm.

English descriptors

KwdEn :
- Annealing, Barium oxides, Chemical composition, Controlled atmospheres, Copper oxides, Crystal-phase transformations, Experimental study, Hybridization, Lattice parameters, Metal-insulator transition, Multi-element compounds, Orbital, Orthorhombic lattices, Polycrystals, Praseodymium oxides, Strontium oxides, Superconducting transition, Superconductivity, Tetragonal lattices, Thulium oxides, XRD.

Abstract

We report on the preparation, X-ray diffraction and a.c. susceptibility of Tm_0.4Pr_0.6Ba_2.kSr_kCu₃O_6+z. An orthorhombic to tetragonal transition was observed for k = 0.8. When the samples (for 0 ≤ k < 1) were heated in argon prior to oxygen annealing, orthorhombicity was found to increase. An insulator to superconductor transition was observed for k ≥ 0.6. The effect of Sr substitution and the heat treatment may lead to a reduction in Pr-f hybridization with oxygen orbitals and to an increase in oxygen ordering favouring the restoration of superconductivity in this compound.

Affiliations:

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Le document en format XML

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Pr<sub>0.6</sub>
Ba<sub>2</sub>
Cu<sub>3</sub>
O<sub>7</sub>
 by iso-valent substitution at Ba site</title>
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Pr<sub>0.6</sub>
Ba<sub>2</sub>
Cu<sub>3</sub>
O<sub>7</sub>
 by iso-valent substitution at Ba site</title>
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<term>Barium oxides</term>
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<term>Controlled atmospheres</term>
<term>Copper oxides</term>
<term>Crystal-phase transformations</term>
<term>Experimental study</term>
<term>Hybridization</term>
<term>Lattice parameters</term>
<term>Metal-insulator transition</term>
<term>Multi-element compounds</term>
<term>Orbital</term>
<term>Orthorhombic lattices</term>
<term>Polycrystals</term>
<term>Praseodymium oxides</term>
<term>Strontium oxides</term>
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<term>Superconductivity</term>
<term>Tetragonal lattices</term>
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<term>XRD</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Transition supraconductrice</term>
<term>Hybridation</term>
<term>Supraconductivité</term>
<term>Composition chimique</term>
<term>Transformation phase cristalline</term>
<term>Réseau orthorhombique</term>
<term>Réseau quadratique</term>
<term>Recuit</term>
<term>Atmosphère contrôlée</term>
<term>Orbitale</term>
<term>Diffraction RX</term>
<term>Transition métal isolant</term>
<term>Paramètre cristallin</term>
<term>Polycristal</term>
<term>Thulium oxyde</term>
<term>Praséodyme oxyde</term>
<term>Baryum oxyde</term>
<term>Strontium oxyde</term>
<term>Etude expérimentale</term>
<term>7462B</term>
<term>7425J</term>
<term>7472Y</term>
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<front><div type="abstract" xml:lang="en">We report on the preparation, X-ray diffraction and a.c. susceptibility of Tm<sub>0.4</sub>
Pr<sub>0.6</sub>
Ba<sub>2.k</sub>
Sr<sub>k</sub>
Cu<sub>3</sub>
O<sub>6+z</sub>
. An orthorhombic to tetragonal transition was observed for k = 0.8. When the samples (for 0 ≤ k < 1) were heated in argon prior to oxygen annealing, orthorhombicity was found to increase. An insulator to superconductor transition was observed for k ≥ 0.6. The effect of Sr substitution and the heat treatment may lead to a reduction in Pr-f hybridization with oxygen orbitals and to an increase in oxygen ordering favouring the restoration of superconductivity in this compound.</div>
</front>
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<tree><country name="France"><region name="Île-de-France"><name sortKey="Colonescu, L" sort="Colonescu, L" uniqKey="Colonescu L" first="L." last="Colonescu">L. Colonescu</name>
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Insulator-superconductor transition in Tm0.4Pr0.6Ba2Cu3O7 by iso-valent substitution at Ba site

Insulator-superconductor transition in Tm0.4Pr0.6Ba2Cu3O7 by iso-valent substitution at Ba site

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri