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N-point model for the Hidden Order phase of URu<sub>2</sub>Si<sub>2</sub>

ORAL

Abstract

The 5f heavy fermion system of URu2Si2 is famous for an unconventional hidden order (HO) phase transition at T0=17.5K and the various related doping phase diagrams explored to elucidate the nature of this unknown transition. A new model of an extended U 5f saddle-point dispersion at the N-point is proposed for the underlying physics of this 35-year old puzzle. With a 10X DFT energy renormalization suggested by angle resolved photoemission (ARPES) measurements [1], this feature lies only a few meV below EF, and thus is thermally active at T0. ARPES reveals a distinct temperature-dependent evolution of incommensurate 5f nesting hotspots lying along Z-N-Z [1], whose origins are found in electronic susceptibility calculations of intraband q-scattering for thermal occupations in the temperature range of T0. Tuning of the N-point region f-band energetics with chemical doping is proposed to unify our understanding of the various phase diagrams, and ARPES confirms the existence of N-point spectral and dichroic changes for ferromagnetic Re/Ru-substitution, for (001) antiferromagnetic Fe and Os/Ru-substitution, and for (1/2,1/2,1/2) antiferromagnetic P/Si-substitution.

[1] J. D. Denlinger et al., Electron. Struct. 4, 013001 (2022).

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Publication: J. D. Denlinger et al., Electron. Struct. 4, 013001 (2022). 10.1088/2516-1075/ac4315

Presenters

  • Jonathan D Denlinger

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California

Authors

  • Jonathan D Denlinger

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Laboratory, Berkeley, California

  • Jeongsoo Kang

    The Catholic University of Korea, Catholic University of Korea

  • Lenart Dudy

    SOLEIL, France

  • James W Allen

    University of Michigan, U. of Michigan

  • Lewis A Wray

    New York University (NYU), New York University

  • Andrew Gallagher

    NHMFL, Florida State U.

  • Ryan E Baumbach

    National High Magnetic Field Laboratory, University of California San Diego, NHMFL, Florida State U.

  • Nicholas P Butch

    National Institute of Standards and Tech, NIST and U. of Maryland

  • M Brian Maple

    University of California, San Diego, University of California San Diego, U. of California, San Diego