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Are heavy-fermion metals Fermi liquids? |
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| Authors: | F Steglich P Gegenwart R Helfrich C Langhammer P Hellmann L Donnevert C Geibel M Lang G Sparn W Assmus GR Stewart A Ochiai |
| Institution: | 122. Institut für Festk?rperphysik, SFB 252, TH Darmstadt, Hochschulstrasse 8, D-64289, Darmstadt, Germany 222. Max-Planck-Institut für chemische Physik fester Stoffe, D-01187, Dresden, Germany 322. Physikalisches Institut, Universit?t Frankfurt, Robert-Mayer-Strasse 2-4, D-60325, Frankfurt/Main, Germany 422. Institut für Physik, Universit?t Augsburg, Universit?tsstrasse 1, D-86159, Augsburg, Germany 522. 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 normalstate 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. |
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