Precursor State to Unconventional Superconductivity in CeIrIn5.
We present Hall effect and magnetoresistance measurements in the heavy fermion superconductor CeIrIn(5). At low temperature, a Kondo coherent state is established. Deviations from Kohler's rule and a quadratic temperature dependence of the cotangent of the Hall angle are reminiscent of properties observed in the high-temperature superconducting cuprates. A striking observation pertains to the presence of a precursor state--characterized by a change in the Hall mobility--that precedes the superconductivity in this material, in similarity to the pseudogap in the cuprate superconductors.
Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany.
Sunil
S
Nair
S
S
Wirth
M
M
Nicklas
J L
JL
Sarrao
J D
JD
Thompson
Z
Z
Fisk
F
F
Steglich