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Superconductivity and magnetism in a new class of heavy-fermion materials

  • Author(s): Thompson, JD
  • Movshovich, R
  • Fisk, Z
  • Bouquet, F
  • Curro, NJ
  • Fisher, RA
  • Hammel, PC
  • Hegger, H
  • Hundley, MF
  • Jaime, M
  • Pagliuso, PG
  • Petrovic, C
  • Phillips, NE
  • Sarrao, JL
  • et al.

We report a new family of Ce-based heavy-fermion compounds whose electronic specific heat coefficients range from about 400 to over 700mJ/mol-Ce K . Crystals in this family form as Ce T In , where T = Rh or Ir, n = 1 or 2, and m = 1, with a tetragonal structure that can be viewed as m-layers of CeIn units stacked sequentially along the c-axis with intervening m-layers of TIn . Ambient and high-pressure studies show that the quasi-2D layers of CeIn produce unconventional superconducting and magnetic ground states. This family should enable new understanding of the relationship between magnetism and superconductivity in heavy-fermion materials and more generally of why heavyfermion superconductivity prefers to develop in one structure type and not another. © 2001 Elsevier Science B.V. All rights reserved. 2 n m 3n-2m 3 2 3

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