Zeitschrift für Physik B Condensed MatterISSN: 0722-3277 (printed version) Abstract Volume 103 Issue 2 (1997) pp 235-242 Are heavy-fermion metals Fermi liquids?
F. Steglich (1)(2), P. Gegenwart (1), R. Helfrich (1), C. Langhammer (1), P. Hellmann (1), L. Donnevert (1), C. Geibel (1), M. Lang (1)(2), G. Sparn (1)(2), W. Assmus (3), G.R. Stewart (4), A. Ochiai (5)
(1) Institut für Festkörperphysik, SFB 252, TH Darmstadt, Hochschulstrasse 8, D-64289 Darmstadt, Germany
Abstract. We present the results of specific-heat and resistivity measurements as a function of temperature, magnetic field and hydrostatic pressure on the Kondo lattice CeNi2Ge2, the heavy-fermion superconductors CeCu2Si2 and UBe13 as well as the low-carrier-density system Yb4As3. "Non-Fermi-liquid" effects in the low-temperature normal-state properties of the three former systems are consistent with the existence of a "nearby" quantum critical point, presumably of antiferromagnetic type. Yb4As3, though showing the outward appearance of a Landau-type heavy-fermion metal, behaves very differently, i.e. as an extreme two-fluid system. PACS: 71.28.+d; 75.40.-s; 74.70.Tx
Article in PDF-Format
Last change: May 27, 1997 |