Please use this identifier to cite or link to this item:
http://acervodigital.unesp.br/handle/11449/75942
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Foury-Leylekian, P. | - |
dc.contributor.author | Petit, S. | - |
dc.contributor.author | Mirebeau, I. | - |
dc.contributor.author | André, G. | - |
dc.contributor.author | De Souza, M. | - |
dc.contributor.author | Lang, M. | - |
dc.contributor.author | Ressouche, E. | - |
dc.contributor.author | Moradpour, A. | - |
dc.contributor.author | Pouget, J. P. | - |
dc.date.accessioned | 2014-05-27T11:29:57Z | - |
dc.date.accessioned | 2016-10-25T18:51:09Z | - |
dc.date.available | 2014-05-27T11:29:57Z | - |
dc.date.available | 2016-10-25T18:51:09Z | - |
dc.date.issued | 2013-07-10 | - |
dc.identifier | http://dx.doi.org/10.1103/PhysRevB.88.024105 | - |
dc.identifier.citation | Physical Review B - Condensed Matter and Materials Physics, v. 88, n. 2, 2013. | - |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.issn | 1550-235X | - |
dc.identifier.uri | http://hdl.handle.net/11449/75942 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/75942 | - |
dc.description.abstract | We present a detailed low-temperature investigation of the statics and dynamics of the anions and methyl groups in the organic conductors (TMTSF) 2PF6 and (TMTSF)2AsF6 (TMTSF: tetramethyl-tetraselenafulvalene). The 4 K neutron-scattering structure refinement of the fully deuterated (TMTSF)2PF6-D12 salt allows locating precisely the methyl groups at 4 K. This structure is compared to the one of the fully hydrogenated (TMTSF)2PF6-H12 salt previously determined at the same temperature. Surprisingly, it is found that deuteration corresponds to the application of a negative pressure of 5×102 MPa to the H12 salt. Accurate measurements of the Bragg intensity show anomalous thermal variations at low temperature both in the deuterated PF 6 and AsF6 salts. Two different thermal behaviors have been distinguished. Small Bragg-angle measurements reflect the presence of low-frequency modes at characteristic energies θE = 8.3 K and θE = 6.7 K for the PF6-D12 and AsF6-D12 salts, respectively. These modes correspond to the low-temperature methyl group motion. Large Bragg-angle measurements evidence an unexpected structural change around 55 K, which probably corresponds to the linkage of the anions to the methyl groups via the formation of F...D-CD2 bonds observed in the 4 K structural refinement. Finally we show that the thermal expansion coefficient of (TMTSF)2PF6 is dominated by the librational motion of the PF6 units. We quantitatively analyze the low-temperature variation of the lattice expansion via the contribution of Einstein oscillators, which allows us to determine for the first time the characteristic frequency of the PF6 librations: θE ≈ 50 K and θE = 76 K for the PF6-D12 and PF6-H12 salts, respectively. © 2013 American Physical Society. | en |
dc.language.iso | eng | - |
dc.source | Scopus | - |
dc.title | Low-temperature structural effects in the (TMTSF)2PF6 and AsF6 Bechgaard salts | en |
dc.type | outro | - |
dc.contributor.institution | CNRS UMR 8502 | - |
dc.contributor.institution | CEA-CNRS UMR 12 | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.contributor.institution | SFB/TR 49 | - |
dc.contributor.institution | INAC | - |
dc.description.affiliation | Laboratoire de Physique des Solides Université Paris-Sud CNRS UMR 8502, F-91405 Orsay Cedex | - |
dc.description.affiliation | Laboratoire Léon Brillouin CEA-CNRS UMR 12, F-91191 Gif-sur-Yvette cedex | - |
dc.description.affiliation | Instituto de Geociências e Ciências Exatas-IGCe Unesp-Univ Estadual Paulista Departamento de Física, Cx. Postal 178, 13506-900 Rio Claro (SP) | - |
dc.description.affiliation | Physikalisches Institut Goethe-Universität Frankfurt SFB/TR 49, D-60438 Frankfurt (M) | - |
dc.description.affiliation | SPSMS UMR-E CEA/UJF-Grenoble 1 INAC, Grenoble, F-38054 | - |
dc.description.affiliationUnesp | Instituto de Geociências e Ciências Exatas-IGCe Unesp-Univ Estadual Paulista Departamento de Física, Cx. Postal 178, 13506-900 Rio Claro (SP) | - |
dc.identifier.doi | 10.1103/PhysRevB.88.024105 | - |
dc.identifier.wos | WOS:000321717800001 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.identifier.file | 2-s2.0-84880790738.pdf | - |
dc.relation.ispartof | Physical Review B: Condensed Matter and Materials Physics | - |
dc.identifier.scopus | 2-s2.0-84880790738 | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.