Dynamics of a fractal set of first-order magnetic phase transitions in frustrated Lu2 CoMnO6

Adra Carr, John Bowlan, Claudio Mazzoli, Colby Walker, Xiaxin Ding, Andi Barbour, Wen Hu, Stuart Wilkins, Jong Hyuk Kim, Nara Lee, Young Jai Choi, Shi Zeng Lin, Richard L. Sandberg, Vivien S. Zapf

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1 Citation (Scopus)


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.

Original languageEnglish
Article numberL060401
JournalPhysical Review B
Issue number6
Publication statusPublished - 2021 Feb 4

Bibliographical note

Funding Information:
Supported in part by the NSF.

Publisher Copyright:
© 2021 American Physical Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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