[Zurück]

G. Pristás, M. Reiffers, E. Bauer:
"Point-contact properties of non-Fermi liquid compounds YbCu_5-xAl_x (x=1.3,1.4 and 1.6) in the vicinity of QCP";
Physica B: Condensed Matter, 378-380 (2006), S. 100 - 101.

Point-contact properties of non-Fermi liquid compounds YbCu_5-xAl_x (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.

Abstract

Point-contact measurements of heterocontacts between non-Fermi liquid compounds YbCu_5-xAl_x 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; YbCu_5-xAl_x

PACS classification codes: 71.27.+a; 72.90.+y; 73.40.Jn

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938268

http://dx.doi.org/10.1016/j.physb.2006.01.040