Surface State Modification of XRu$_{2}$Si$_{2}$, X=(La, Ce, Th, U)

ORAL

Abstract

The three-dimensional electronic structures of heavy fermion f-electron materials XRu$_{2}$Si$_{2}$ X=(Ce,U) and their non-f reference materials (X=La,Th) are investigated using photon-dependent angle-resolved photoemission spectroscopy (ARPES). The spatial-dependences of the characterization of UHV-cleaved surfaces combined with guidance from theoretical surface slab calculations clearly identify surface termination related features resulting from cleavage between X-Si layers. Experimental ARPES results are shown for various adsorbate and dosing experiments that suppress or modify the surface states via Si adatom bonding or charge transfer. These results greatly aid the clear identification of the true bulk bands. Differences in the surface state electronice structures between X=(La,Ce, Th, U) arise mainly from different band fillings related to the valence of the bulk X atom.

*Supported by the U.S. DOE at the Advanced Light Source (DE-AC02-05CH11231), at UM (DE-FG02-07ER46379) and UCSD (FG02-04ER46105 \& FG02-04ER46178), and by the NSF at UCSD (DMR08-02478).

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Authors

  • J.D. Denlinger

    • Lawrence Berkeley National Lab

  • O. Krupin

    • Lawrence Berkeley National Lab

  • B.J. Kim

    • U. of Michigan

  • J.W. Allen

    • U. of Michigan

  • Kristjan Haule

    • Rutgers University

  • Kyoo Kim

    • Rutgers University

  • Gabriel Kotliar

    • Rutgers University

  • J.L. Sarrao

    • Los Alamos National Lab

  • Nicholas Butch

    • University of Maryland, Physics Department
    • University of Maryland, College Park
    • UC San Diego
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD 20742
    • Center for Nanophysics \& Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA
    • Center for Nano Physics and Advanced Materials, Department of Physics, University of Maryland
    • University of Maryland

  • M. B. Maple

    • Department of Physics, University of California at San Diego, La Jolla, CA, USA
    • Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
    • UC San Diego
    • University of California, San Diego