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.

*LDRD program at LANL; Beamline 23-ID-1 NSLS II at Brookhaven National Lab, U.S. DOE Office of Science DE-SC0012704; National High Magnetic Field Lab: U.S. NSF through Cooperative Grant No. DMR-1157490, the State of Florida, and the U.S. DOE; CINT at LANL, a US DOE Office of Science User Facility; National Research Foundation of Korea NRF-2017R1A5A1014862 (SRC program: vdWMRC center, NRF-2018R1C1B6006859, and NRF-2019R1A2C2002601)

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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