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Spin Dynamics in Honeycomb J<sub>1</sub>-J<sub>2</sub>-J<sub>3</sub> CaMn<sub>2</sub>​P<sub>2 </sub>Studied by Inelastic Neutron Scattering

ORAL

Abstract

Previous elastic neutron-scattering results on CaMn₂P₂ had identified a 6x6 magnetic unit-cell, a first-order phase transition at the Néel temperature TN = 70(1) K, and a spiral spin liquid phase above this transition. In this work, we employ spin dynamics simulations of a frustrated J1-J2-J3 Heisenberg model on a corrugated honeycomb lattice to fit inelastic neutron scattering data of the CaMn₂P₂ compound to reveal fundamental exchange interactions and anisotropies. This study extracts the J1, J2, and J3 interactions, interlayer coupling, and anisotropy by modeling the magnon dispersion using the Su(n)ny spin-dynamics package. Our findings reproduce the observed magnetic properties and provide realistic magnetic models that can be used to explain the temperature-dependent thermodynamic behaviors such as specific heat and magnetic susceptibility.

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Presenters

  • Farhan Islam

    Oak Ridge National Laboratory, Iowa State University

Authors

  • Farhan Islam

    Oak Ridge National Laboratory, Iowa State University

  • Santanu Pakhira

    Ames National Laboratory

  • Jiankun Zhang

    Ames National Laboratory

  • Thais V Trevisan

    University of São Paulo, São Carlos Institute of Physics, University of São Paulo, Ames Laboratory, University of Sao Paulo, UC Berkeley

  • Simon Xavier Marie Riberolles

    Ames National Laboratory, Ames National Laboratory and Iowa State University

  • Douglas L Abernathy

    Oak Ridge National Laboratory

  • Andrei T Savici

    Oak Ridge National Laboratory

  • David C Johnston

    Ames National Laboratory, Iowa State University

  • Robert J McQueeney

    Iowa State University, Ames National Laboratory and Iowa State University

  • Peter Philipp Orth

    Iowa State University

  • Feng Ye

    Oak Ridge National Laboratory

  • David Vaknin

    Iowa State University