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Zeitschrift für Physik B Condensed Matter

ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)

Table of Contents

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
(2) Max-Planck-Institut für chemische Physik fester Stoffe, D-01187 Dresden, Germany
(3) Physikalisches Institut, Universität Frankfurt, Robert-Mayer-Strasse 2-4, D-60325 Frankfurt/Main, Germany
(4) Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86159 Augsburg, Germany
(5) Department of Material Science and Technology, Faculty of Engineering, Niigata University, Niigata 950-21, Japan

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

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