Superconductivity and Magnetism in a New Class of Heavy-Fermion   Materials
  We report a new family of Ce-based heavy-fermion compounds whose electronic specific heat coefficients range from about 400 to over 700 mJ/mole Ce-K2. Crystal in this family form as CenTmIn3n+2m, where T=Rh or Ir, n=1 or 2, and m=1, with a tetragonal structure that can be viewed as n-layers of CeIn3 units stacked sequentially along the c-axis with intervening m-layers of TIn2. Ambient and high pressure studies show that the quasi-2D layers of CeIn3 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 heavy-fermion superconductivity prefers to develop in one structure type and not another. 
J.D. Thompson, R. Movshovich, Z. Fisk, F. Bouguet, N.J. Curro, R.A.   Fisher, P.C. Hammel, H. Hegger, M.F. Hundley, M. Jaime...