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    STUDIA PHYSICA - Issue no. SPECIAL ISSUE / 2001  
         
  Article:   THE IMPORTANCE OF HAVING DIFFERENT ISOTOPES IN NMR/NQR STUDIES.

Authors:  DETLEF BRINKMANN.
 
       
         
  Abstract:  The paper reviews some less known but representative examples where the NMR study of two isotopes of the same element yields important information on very different characteristic features of the compound. We will discuss the following examples: (i) Determination of the type of molecular movements of a transient Xe molecule in the gas phase (by using the Xe isotopes 129Xe and 131Xe). (ii) Classical nature of the isotope effect of the Li diffusion coefficient in Li metal ( 7Li and 6Li in solid Li). (iii) Dynamics of Cu-O chains in a high-temperature supercon-ductors ( 63Cu and 65Cu). (iv) Isotope shift of the opening temperature of the spin gap in the superconductor YBa2Cu4O8 using 16O and 18O exchanged samples; in this example only one NMR isotope, 63Cu, is studied.  
         
     
         
         
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