Heavy quasiparticles in the ferromagnetic superconductor ZrZn2

Details Heavy quasiparticles in the ferromagnetic superconductor ZrZn2 Heavy quasiparticles in the ferromagnetic superconductor ZrZn2

2002-07-11

arxiv.org/abs/cond-mat/0207285v1

Phys. Rev. Lett. vol 90, 057003 (2003).

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures (one color)

Scientific paper

10.1103/PhysRevLett.90.057003

We report a study of the de Haas-van Alphen effect in the normal state of the ferromagnetic superconductor ZrZn2. Our results are generally consistent with an LMTO band structure calculation which predicts four exchange-split Fermi surface sheets. Quasiparticle effective masses are enhanced by a factor of about 4.9 implying a strong coupling to magnetic excitations or phonons. Our measurements provide insight in to the mechanism for superconductivity and unusual thermodynamic properties of ZrZn2.

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