Possible phase separation and weak localization in the absence of a charge-density wave in single-phase 1 T-VS 2 (Articolo in rivista)

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  • Possible phase separation and weak localization in the absence of a charge-density wave in single-phase 1 T-VS 2 (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.89.235125 (literal)
Alternative label
  • Gauzzi, Andrea and Sellam, A and Rousse, G and Klein, Y and Taverna, D and Giura, P and Calandra, M and Loupias, G and Gozzo, F and Gilioli, E and others (2014)
    Possible phase separation and weak localization in the absence of a charge-density wave in single-phase 1 T-VS 2
    in Physical review. B, Condensed matter and materials physics (Online); The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gauzzi, Andrea and Sellam, A and Rousse, G and Klein, Y and Taverna, D and Giura, P and Calandra, M and Loupias, G and Gozzo, F and Gilioli, E and others (literal)
Pagina inizio
  • 235125-1 (literal)
Pagina fine
  • 235125-10 (literal)
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  • 89 (literal)
Rivista
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  • 10 (literal)
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  • 23 (literal)
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  • IMPMC, UPMC-Sorbonne Universit´es, CNRS, MNHN, IRD, 4, place Jussieu, 75005 Paris, France Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland Istituto dei materiali per elettronica e magnetismo, Consiglio Nazionale delle Ricerche, Area delle Scienze, 43100 Parma, Italy Dipartimento di fisica, Universit`a di Parma, 43100 Parma, Italy Dipartimento di chimica - GIAF, Universit`a di Parma, 43100 Parma, Italy Synchrotron Soleil, L'Orme des M´erisiers, Saint-Aubin - 91192 Gif-sur-Yvette, France (literal)
Titolo
  • Possible phase separation and weak localization in the absence of a charge-density wave in single-phase 1 T-VS 2 (literal)
Abstract
  • We report on a systematic study of the structural, magnetic, and transport properties of high-purity 1T -VS2 powder samples prepared under high pressure. The results differ notably from those previously obtained by deintercalating Li from LiVS2. First, no charge-densitywave (CDW) is found by transmission electronmicroscopy down to 94 K, though ab initio phonon calculations unveil a latent CDW instability driven by an acoustic phonon softening at the wave vector qCDW ? (0.21,0.21,0) previously reported in deintercalated samples. A further indication of latent lattice instability is given by an anomalous expansion of the V-S bond distance at low temperature. Second, infrared optical absorption and electrical resistivity measurements give evidence of nonmetallic properties, consistent with the observation of no CDW phase. On the other hand, magnetic susceptibility and NMR data suggest the coexistence of localized moments with metallic carriers, in agreement with ab initio band structure calculations. This discrepancy is reconciled by a picture of electron localization induced by disorder or electronic correlations leading to a phase separation of metallic and nonmetallic domains in the nm scale.We conclude that 1T -VS2 is at the verge of a CDWtransition and suggest that residual electronic doping in Li deintercalated samples stabilizes a uniform CDW phase with metallic properties. (literal)
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