Structural studies of Fe-doped URu<sub>2</sub>Si<sub>2</sub> near the hidden order transition using X-ray crystallography

ORAL

Abstract

The origin of hidden order (HO) in URu2Si2 has been debated for the past thirty years. An interesting observation in recent years is the phase transition into a large moment antiferromagnetic (LMAF) state under either high pressure or Fe substitution for Ru. We used low-temperature x-ray crystallography to study the structure of URu2Si2, both with and without Fe doping. We observed changes in the intensities of the Bragg peaks suggesting the HO transition is associated with a breaking of spacegroup symmetry not accompanied by a change in lattice parameters. The pattern of atomic displacements changes markedly when crossing into the LMAF phase via Fe doping. No structural superlattice reflections were observed, consistent with past studies. We will discuss how our results constrain the subgroups and physical origin of the HO and LMAF phases.

*This work was supported by DOE Office of Basic Energy Sciences grant no. DE-FG02-06ER46285.

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Presenters

  • Xiaolan Sun

    • University of Illinois at Urbana-Champaign

Authors

  • Xiaolan Sun

    • University of Illinois at Urbana-Champaign

  • John A Mydosh

    • Leiden University

  • Naveen Pouse

    • University of California, San Diego
    • physics, University of Califormia, San Diego

  • M Brian Maple

    • Department of Physics, University of California, San Diego
    • UCSD
    • University of California, San Diego
    • physics, University of Califormia, San Diego
    • Departement of Physics, University fo California, San Diego
    • Physics, University of California, San Diego

  • Sangjun Lee

    • University of Illinois,Urbana Champaign
    • Department of Physics, Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
    • University of Illinois Urbana Champaign
    • University of Illinois at Urbana-Champaign

  • Peter Abbamonte

    • University of Illinois at Urbana-Champaign
    • University of Illinois,Urbana Champaign