Transport and Thermodynamic Properties of UNi2Al3 and UPd2Al3

  • C. Geibel
  • A. Böhm
  • C. D. Bredl
  • R. Caspary
  • A. Grauel
  • A. Hiess
  • C. Schank
  • F. Steglich
  • G. Weber
Chapter

Abstract

We present and discuss the transport and thermodynamic properties of the new heavy-fermion superconductors UNi2Al3 and UPd2Al3. Analysis of the normal-state properties of UPd2Al3 indicates pronounced crystal-field effects and suggests a 5f2 configuration with a lowest-lying singlet. From the shifts of the maxima in the resistivity and susceptibility to higher temperatures when replacing Pd by Ni we deduce an increase by a factor of 3 in the crystal field splitting Δ. The energy scale for the screening of the 5f electrons appears to scale with Δ, leading to the observed reduction of the ordered moment on going from the Pd- to the Ni-compound. The specific heat in the superconducting state of UPd2Al3 shows many similarities to the specific heat of other heavy fermion superconductors. The temperature dependence of the thermodynamic critical field determined from the specific heat is close to the result of the BCS-theory.

Keywords

Superconducting State Heavy Fermion Kondo Effect Crystal Field Splitting Heavy Fermion Compound 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. /1/.
    K. Andres et al., Phys. Rev. Lett. 35, 1779 (1975).ADSCrossRefGoogle Scholar
  2. /2/.
    F. Steglich et al., Phys. Rev. Lett. 43, 1892 (1979).ADSCrossRefGoogle Scholar
  3. /3/.
    /3/ For a recent review, see: N. Grewe, F. Steglich, in: Handbook on the physics and chemistry of rare earths, K.A. Gschneidner Jr., L. Eyring (eds.), Vol. 14, Chapt. 97.Google Scholar
  4. /4/.
    C. Geibel et al., Z. Phys. B 83, 305 (1991).ADSCrossRefGoogle Scholar
  5. /5/.
    C. Geibel et al., Z. Phys. B 84, 1 (1991).ADSCrossRefGoogle Scholar
  6. /6/.
    F. Steglich et al., in: Frontiers in solid state sciences, L.C. Gupta, M.S. Multani (eds.), World Scientific Publishing Company, in press.Google Scholar
  7. /7/.
    A. Amato et al., Z. Phys. B 86, 159 (1992).ADSCrossRefGoogle Scholar
  8. /8/.
    A. Krimmel et al., Z. Phys. B 86, 161 (1992).ADSCrossRefGoogle Scholar
  9. /9/.
    F. Steglich et al., Physica C 185–189, 379 (1991).ADSCrossRefGoogle Scholar
  10. /10/.
    A. Grauel et al., Phys. Rev. B 46, 5818 (1992).ADSCrossRefGoogle Scholar
  11. /11/.
    A. Böhm et al., Int. J. of Modern Physics, in press.Google Scholar
  12. /12/.
    C. Geibel et al., Physica C 185–189, 2651 (1991).ADSCrossRefGoogle Scholar
  13. /13/.
    A. Böhm et al., to be published.Google Scholar
  14. /14/.
    K. Andres et al., Phys. Rev. Lett. 52, 1551 (1984).CrossRefGoogle Scholar
  15. /15/.
    R. Felten, PhD Thesis, TH Darmstadt (1987).Google Scholar
  16. /16/.
    G.J. Nieuwenhuys, Phys. Rev. B 35, 5260 (1987).ADSCrossRefGoogle Scholar
  17. /17/.
    R.J. Radwanski, J. Magn. Magn. Mat. 103, L1 (1992).ADSCrossRefGoogle Scholar
  18. /18/.
    C. Broholm et al., Phys. Rev. B 43, 12809 (1991).ADSCrossRefGoogle Scholar
  19. /19/.
    C. Schank et al., Int. J. of Modern Physics.Google Scholar
  20. /20/.
    A. Loidl et al., Ann. Physik 1, 78 (1992).ADSCrossRefGoogle Scholar
  21. /21/.
    V.T. Rajan, Phys. Rev. Lett. 51, 308 (1983).ADSCrossRefGoogle Scholar
  22. /22/.
    Y. Lassailly et al., J. Magn. Magn. Mat. 47&48, 501 (1985).CrossRefGoogle Scholar
  23. /23/.
    A. Grauel et al., Int. J. of Modern Physics, in press.Google Scholar
  24. /24/.
    R. Caspary et al., to be published.Google Scholar
  25. /25/.
    F. Steglich, Vol. 62 of: Springer Series in Solid-State Sciences, p. 23 (1985).Google Scholar
  26. /26/.
    A. Ravex et al., J. Magn. Magn. Mat. 63&64, 400 (1987).CrossRefGoogle Scholar
  27. /27/.
    A. Sulpice et al., J. Low Temp. Phys. 62, 39 (1986).ADSCrossRefGoogle Scholar
  28. /28/.
    W. Schlabitz et al., Z. Phys. B 62, 171 (1986).ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • C. Geibel
    • 1
  • A. Böhm
    • 1
  • C. D. Bredl
    • 1
  • R. Caspary
    • 1
  • A. Grauel
    • 1
  • A. Hiess
    • 1
  • C. Schank
    • 1
  • F. Steglich
    • 1
  • G. Weber
    • 1
  1. 1.Institut für FestkörperphysikTH DarmstadtDarmstadtGermany

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