Publications in Scientific Journals:
G. Pristás, M. Reiffers, E. Bauer:
"Point-contact properties of non-Fermi liquid compounds YbCu5-xAlx (x=1.3,1.4 and 1.6) in the vicinity of QCP";
Physica B: Condensed Matter,
Point-contact properties of non-Fermi liquid compounds YbCu5-xAlx (x=1.3,1.4 and 1.6) in the vicinity of QCP
Gabriel Pristás a, Marián Reiffers a, Ernst Bauer b
a Institute of Experimental Physics, Center of Very Low Temperatures, Watsonova 47, 043 53 Kosice, Slovakia
b Institut für Festkörperphysik, Technische Universität Wien, 1040 Wien, Austria
Available online 23 February 2006.
Point-contact measurements of heterocontacts between non-Fermi liquid compounds YbCu5-xAlx and Cu or Pt in zero magnetic field as well as in applied magnetic fields up to 6 T in the temperature region 1.5-10 K (x=1.3,1.4 and 1.6) are presented. We observed for x=1.6 the same type of behaviour (characteristic asymmetric behaviour of (dV/dI(V))) with a maximum in one polarity close to zero applied voltage and similar magnetic field and temperature dependencies as previously reported for x=1.5. On the contrary, the PC dependencies for x=1.3 and 1.4 show different behaviour-the shoulder in both polarities on the same energy position. This behaviour is characteristic for Kondo compounds. NFL behaviour is present for x=1.6 but both, a further decrease or increase of the Al content continuously suppresses NFL behaviour.
Keywords: NFL phenomena; Point-contacts; YbCu5-xAlx
PACS classification codes: 71.27.+a; 72.90.+y; 73.40.Jn
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