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Dynamics of a fractal set of first-order magnetic phase transitions in frustrated Lu2CoMnO6

Adra Carr1,2,*, John Bowlan3,*, Claudio Mazzoli4,*, Colby Walker2,5, Xiaxin Ding1,†, Andi Barbour4, Wen Hu4, Stuart Wilkins4, Jong Hyuk Kim6 et al.

Nara Lee6, Young Jai Choi6, Shi-Zeng Lin7, Richard L. Sandberg2,5, and Vivien S. Zapf1

  • 1National High Magnetic Field Laboratory, Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87545, USA
  • 2Center for Integrated Nanotechnologies, LANL, Los Alamos, New Mexico 87545, USA
  • 3C-PCS, LANL, Los Alamos, New Mexico 87545, USA
  • 4NSLS-II, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 5Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA
  • 6Department of Physics, Yonsei University, Seoul 03722, Korea
  • 7Theoretical Division, LANL, Los Alamos, New Mexico 87545, USA

  • *These authors contributed equally to this work.
  • †Present address: Idaho National Laboratory, Idaho Falls, Idaho 83415, USA.
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Phys. Rev. B 103, L060401 – Published 4 February, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L060401

Abstract

The axial next-nearest-neighbor Ising model predicts a fractal (infinite) set of phases with incommensurate wave vectors that are separated by first-order phase boundaries. This complexity results from a simple frustration condition between nearest- and next-nearest-neighbor interactions along a chain of Ising spins. Using x-ray photon correlation spectroscopy (XPCS), we investigate the surprising antiferromagnetic dynamics that emerge from such a complex phase diagram over a wide range of temperatures. We present XPCS measurements of the frustrated magnetic chain compound Lu2CoMnO6 and Monte Carlo simulations. Incommensurate magnetic Bragg peaks slide towards commensurate “up-up-down-down” spin order with decreasing temperature and increasing time. Both simulation and experiment support a counterintuitive “upside-down” temperature dependence of the magnetic dynamics: at higher temperatures in the region of first-order phase boundaries, slower dynamics are observed where the speckle maintains its coherence. At the lowest temperatures, where part of the sample adopts commensurate order, the dynamics speed up and result in fast decoherence.

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Phys. Rev. B 103, L060401– Published 4 February, 2021
  • Received 28 May 2020
  • Revised 10 December 2020
  • Accepted 13 January 2021
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