Point-contact spectroscopy on URu${}_2$Si${}_2$

Abstract

Tunnel and point contact experiments have been made in a URu${}_2$Si${}_2$ single crystal along the c-axis. The experiments were performed changing temperature and contact size in a low temperature scanning tunneling microscope. A resonance develops at the Fermi level at $T\sim 60$ K. This resonance splits and becomes asymmetric when the 17.5 K phase transition is crossed. These results are consistent with the existence of Kondo like bound states of the U${}^{4+}$ ionic configurations and the conduction electrons. Below the transition, these configurations are split by the development of quadrupolar ordering. The peak separation can be interpreted as a direct measurement of the order parameter. Measurements on a policrystalline UAu_2Si_2$ sample are also reported, with a comparative study of the behavior of both materials.

4 pages (Latex) + 2 postscript figures

References in corpus (2)

• Lifetime of Two-Dimensional Electrons Measured by Tunneling Spectroscopy
• Singlet Magnetism in Heavy Fermions

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