The Nature of Heavy Quasiparticles in Magnetically Ordered Heavy Fermions

Details The Nature of Heavy Quasiparticles in Magnetically Ordered Heavy Fermions The Nature of Heavy Quasiparticles in Magnetically Ordered Heavy Fermions

2002-01-11

arxiv.org/abs/cond-mat/0201167v1

Phys. Rev. Lett. 88, 186404 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 4 pages, 3 figures, email: dressel@pi1.physik.uni-stuttgart.de

Scientific paper

10.1103/PhysRevLett.88.186404

The optical conductivity of the heavy fermions UPd2Al3 and UPt3 has been measured in the frequency range from 10 GHz to 1.2 THz (0.04 meV to 5 meV) at temperatures 1 K < T < 300 K. In both compounds a well pronounced pseudogap of less than a meV develops in the optical response at low temperatures; we relate this to the antiferromagnetic ordering. From the energy dependence of the effective electronic mass and scattering rate we derive the energies essential for the heavy quasiparticle. We find that the enhancement of the mass mainly occurs below the energy which is related to magnetic correlations between the local magnetic moments and the itinerant electrons. This implies that the magnetic order in these compounds is the pre-requisite to the formation of the heavy quasiparticle and eventually of superconductivity.

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