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

Details Point-contact spectroscopy on URu$_2$Si$_2$ Point-contact spectroscopy on URu$_2$Si$_2$

1996-09-20

arxiv.org/abs/cond-mat/9609205v2

Physics

Condensed Matter

4 pages (Latex) + 2 postscript figures

Scientific paper

10.1103/PhysRevB.55.14318

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.

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