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Dynamics of a fractal set of 1st order phase transitions and comparison to XPCS data in Lu2CoMnO6

ORAL

Abstract

The Axial Next Nearest Neighbor Ising model predicts a fractal (infinite) set of phases with incommensurate wave vectors that are separated by 1st order phase boundaries. This behavior emerges from a simple frustration condition between nearest and next-nearest neighbors along a chain of Ising spins. Here, we probe the dynamics of this scenario using Monte Carlo simulations and compare to X-ray photon correlation spectroscopy (XPCS) measurements in Lu2CoMnO6. We resonantly probe the dynamics of speckle within Mn and Co L3-edge antiferromagnetic Bragg peaks. Bragg peaks of incommensurate order slide towards commensurate `up up down down' spin order with decreasing temperature and increasing time. Analysis of the speckle dynamics supports a counter-intuitive dependence of the dynamics on temperature that is consistent with our simulations.

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Presenters

  • Vivien Zapf

    Los Alamos Natl Lab, National High Magnetic Field Lab, Los Alamos National Lab, Pulsed Field Facility, Los Alamos National Lab, Los Alamos National Lab, Los Alamos National Laboratory

Authors

  • Adra Carr

    Los Alamos Natl Lab

  • John Bowlan

    Los Alamos Natl Lab

  • Claudio Mazzoli

    Brookhaven National Lab, Brookhaven National Laboratory, Brookhaven Natl Lab

  • Andi Barbour

    Brookhaven National Lab, Brookhaven National Laboratory, Brookhaven Natl Lab, National Synchrotron Light Source II, Brookhaven National Laboratory, NSLS-II, Brookhaven National Laboratory

  • Wen Hu

    Brookhaven Natl Lab

  • Stuart B Wilkins

    Brookhaven Natl Lab

  • Colby S Walker

    Los Alamos Natl Lab

  • Xiaxin Ding

    Idaho National Laboratory, Idaho Natl Lab

  • Jonghyuk Kim

    Yonsei University

  • Nara Lee

    Yonsei University

  • Youngjai Choi

    Yonsei University

  • Shi-Zeng Lin

    Los Alamos National Laboratory, Los Alamos National Lab, Los Alamos Natl Lab, Theoretical Division, T-4, Los Alamos National Laboratory

  • Richard Sandberg

    Brigham Young University

  • Vivien Zapf

    Los Alamos Natl Lab, National High Magnetic Field Lab, Los Alamos National Lab, Pulsed Field Facility, Los Alamos National Lab, Los Alamos National Lab, Los Alamos National Laboratory