Point-contact spectroscopy of the heavy-fermion superconductor CePt$_{3}$Si

Details Point-contact spectroscopy of the heavy-fermion superconductor CePt$_{3}$Si Point-contact spectroscopy of the heavy-fermion superconductor CePt$_{3}$Si

2009-01-16

arxiv.org/abs/0901.2382v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 5 figures, To be published in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/21/7/075703

Differential resistance spectra (${\rm d}V/{\rm d}I-V$ characteristics) have been measured for point-contacts between the heavy-fermion superconductor (HFS) CePt$_{3}$Si and a normal metal. Some contacts show a peak at V=0 that is characteristic of HFS coexisting with a magnetic order such as UPd$_2$Al$_3$, UNi$_2$Al$_3$ and URu$_2$Si$_2$. The evolution of the peak occurs well above the antiferromagnetic transition temperature $T_{{\rm N}}\sim$ 2.2 K, so that the direct relationship with the magnetic transition is questionable. The half-width of the peak seems to reflect the crystal field splitting or the spin-wave gap as observed for the above-mentioned HFSs, possibly suggesting that some common scattering process induces the zero-bias peaks in these materials.

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