http://www.cnr.it/ontology/cnr/individuo/prodotto/ID65118

Stabilization of Superconductivity in Pure and C-Intercalated 1T-TaS2 Synthesised Under High Pressure (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Stabilization of Superconductivity in Pure and C-Intercalated 1T-TaS2 Synthesised Under High Pressure (Articolo in rivista) (literal)

Anno

2010-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.4028/www.scientific.net/AST.75.173 (literal)

Alternative label

Sellam A.; Gilioli E.; Rousse G.; Klein Y.; Porcher F.; Le Godec Y.; Mezouar M.; D'Astuto M.; Taverna D.; Loupias G.; Shukla A.; Gauzzi A. (2010)
Stabilization of Superconductivity in Pure and C-Intercalated 1T-TaS2 Synthesised Under High Pressure
in Advances in science and technology (Online); Trans Tech Publications, Zurich (Svizzera)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Sellam A.; Gilioli E.; Rousse G.; Klein Y.; Porcher F.; Le Godec Y.; Mezouar M.; D'Astuto M.; Taverna D.; Loupias G.; Shukla A.; Gauzzi A. (literal)

Pagina inizio

173 (literal)

Pagina fine

180 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.scientific.net/AST.75.173 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

75 (literal)

Rivista

Advances in science and technology (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

In: Advances in Science and Technology, vol. 75 pp. 173 - 180. 5th FORUM ON NEW MATERIALS PART D. Pietro VINCENZINI, David S. GINLEY, Giovanni BRUNO, Attilio RIGAMONTI and Nikolay ZHELUDEV (eds.). Trans Tech Publications, Switzerland, 2010. (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Institut de Mineralogie et de Physique des Milieux Condense, Universite Pierre et Marie Curie-Paris 6 and CNRS, 75005 Paris, France, CNR-IMEM, Parma, Laboratoire Léon Brillouin, CEA and CNRS, Saclay, France, European Synchrotron Radiation Facility, Grenoble, France (literal)

Titolo

Stabilization of Superconductivity in Pure and C-Intercalated 1T-TaS2 Synthesised Under High Pressure (literal)

Abstract

In order to elucidate the origin of the interplay between charge density wave (CDW) and superconductivity in 1T-TaS2, we have synthesized powder samples of pure and C-intercalated 1T-CxTaS2 by means of a multi-anvil high-pressure synthesis method. We have found that single-phase samples are obtained in the 2-6 GPa range at 400 °C and for x=0-0.3. The structural, magnetic and transport properties of all samples have been investigated by means of neutron and x-ray diffraction, dc magnetization and dc electrical resistivity. For all x values including x=0, the data show that the CDW phase is suppressed concomitant to an abrupt onset of superconductivity, with Tc=3.2 K for x=0. The Tc value turns out to be weakly dependent on x, with a maximum Tc=3.8 K for x=0.2. This onset is accompanied by a crossover of magnetic behavior from paramagnetic Pauli-like to paramagnetic Curie-Weiss-like with effective moment µ H 1.2 µB/Ta, which suggests that a ionic picture is suitable for the superconducting phase, but not for the CDW phase. The analysis of the dependence of the a and c lattice parameters upon x as well as upon the synthesis conditions shows that the onset of superconductivity is mainly ascribed to unusual changes of the unit cell induced by the high-pressure synthesis. Specifically, the ex-situ lattice parameters exhibit a significantly larger c-axis parameter and a shrinking of the a-axis parameter stabilized by the high-pressure synthesis route. We argue that the above suppression of the CDW phase is induced by a broadening of the relevant 5d(t2g) band which stabilizes the metallic and superconducting phases. This scenario suggests that the strength of the electronic correlations are the main control parameter of the CDW-superconductivity competition in 1T-TaS2. (literal)

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