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1998 (1)
1Author    Detlef BrinkmannRequires cookie*
 Title    Spin Gap, Electronic Crossover, and Charge Density Waves in Y-Ba-Cu-O Superconductors  
 Abstract    This paper discusses recent NQR/NMR studies performed on Y-Ba-Cu-0 superconductors at the Uni-versity of Zürich. The work is concerned with normal state properties which are still controversial, for instance the spin-gap effect, i.e. the opening of a pseudo gap in the electron spin excitation spectrum at a temperature 7*, which lies above T c . We will report on the detection of "anomalies" which are dis-played in the temperature dependence of several NMR and NQR quantities measured in the normal state of YBa 2 Cu 4 0 8 . These anomalies are interpreted as an electronic crossover which involves a charge re-distribution in the Cu0 2 planes and an enhancement of the charge fluctuations. As a possible mecha-nism of the crossover, a charge density wave instability is proposed. 
  Reference    Z. Naturforsch. 53a, 488—491 (1998); received December 30 1997 
  Published    1998 
  Keywords    NQR, NMR, High-Temperature Superconductors, Spin gap Electronic Crossover 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0488.pdf 
 Identifier    ZNA-1998-53a-0488 
 Volume    53