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  • PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects  (3)
  • Springer  (3)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Charge-density-wave instabilities and quantum transport in the monophosphate tungsten bronzes with m = 5 alternate structure (2000)
    Springer
    The European physical journal 17 (2000), S. 215-226 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Resistivity, thermoelectric power and magnetotransport measurements have been performed on single crystals of the quasi two-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m for m =5 with alternate structure, between 0.4 K and 500 K, in magnetic fields of up to 36 T. These compounds show one charge density instability (CDW) at 160 K and a possible second one at 30 K. Large positive magnetoresistance in the CDW state is observed. The anisotropic Shubnikov-de Haas and de Haas-van Alphen oscillations detected at low temperatures are attributed to the existence of small electron and hole pockets left by the CDW gap openings. Angular dependent magnetoresistance oscillations (AMRO) have been found at temperatures below 30 K. The results are discussed in terms of a weakly corrugated cylindrical Fermi surface. They are shown to be consistent with a change of the Fermi surface below 30 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070135
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  • 2
    Electronic Resource
    Electronic Resource
    Localization effects in the charge density wave state [4]of the quasi-two-dimensional monophosphate tungsten bronzes (2000)
    Springer
    The European physical journal 14 (2000), S. 73-82 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The monophosphate tungsten bronzes (PO 2 ) 4 (WO 3 ) 2m are quasi-two-dimensional conductors which show charge density wave type electronic instabilities. We report electrical resistivity and magnetoresistance measurements down to 0.30 K and in magnetic fields up to 16 T for the m = 7, 8 and 9 members of this family. We show that these compounds exhibit at low temperature an upturn of resistivity and field dependences of the magnetoresistance characteristic of localization effects. We discuss the dimensionality of the regime of localization as m is varied. We show that for m =7, the regime is quasi-two-dimensional and three-dimensional for m = 8, 9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050108
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic instabilities in the quasi-two-dimensional conducting monophosphate tungsten bronzes K P W O ( ) (2000)
    Springer
    The European physical journal 16 (2000), S. 593-600 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.45.Lr Charge-density-wave systems - 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The monophosphate tungsten bronzes KxP4W8O32 are quasi-two-dimensional conductors. The parent compound P4W8O32 shows two charge density wave instabilities (CDW). The layered structure of the doped compounds contains pseudo hexagonal tunnels stabilised by the insertion of potassium for 0.75〈 x 〈2. In order to study the role of the band filling in the CDW instabilities, we have performed resistivity, magnetoresistance, Hall effect, thermopower and specific heat measurements on the doped compounds with 0.8〈 x 〈1.94. Anomalies at a temperature depending on x appear on all the transport properties. From transport data, we have obtained a phase diagram which shows surprisingly a maximum at 170 K for x =1.3. In the whole range of temperature studied (4.2 K-300 K), the transport properties of KxP4W8O32 show a change for . The diagram is discussed in term of non-monotonous behaviour for the density of states versus the energy and in relation to previous X-ray studies. The transitions in KxP4W8O32 do not seem to be conventional Peierls instabilities in contrast with those observed in pure P4W8O32.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070177
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