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.
Nair
Sunil
S
Max Planck Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, 01187 Dresden, Germany.
Wirth
S
S
Nicklas
M
M
Sarrao
J L
JL
Thompson
J D
JD
Fisk
Z
Z
Steglich
F
F