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Intermediate magnetization state and competing orders in Dy2Ti2O7 and Ho2Ti2O7.

R A Borzi1,2, F A Gómez Albarracín2,3, H D Rosales2,3

  • 1Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, La Plata 1900, Argentina.

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|August 26, 2016
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Summary
This summary is machine-generated.

Investigating spin-ice materials like Dy2Ti2O7 and Ho2Ti2O7 reveals that lattice distortions, not just the standard Hamiltonian, influence their magnetic properties and frustration effects.

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Area of Science:

  • Condensed Matter Physics
  • Magnetism
  • Materials Science

Background:

  • Spin-ice materials exhibit unique properties like residual entropy and fractionalized excitations due to magnetic frustration.
  • The standard classical Hamiltonian may not fully capture the behavior of experimental spin-ice systems.

Purpose of the Study:

  • To determine if the conventional spin-ice Hamiltonian accurately describes experimental systems.
  • To investigate the role of lattice distortions in spin-ice behavior.

Main Methods:

  • Magnetic susceptibility measurements were performed on Dy2Ti2O7 and Ho2Ti2O7 using a vector magnet.
  • An effective Hamiltonian was constructed based on experimental results and theoretical analysis of pyrochlore lattice distortions.
  • Monte Carlo simulations were employed to explore the effective Hamiltonian.

Main Results:

  • The constructed effective Hamiltonian successfully reproduces experimental magnetic susceptibility data.
  • The model accounts for the formation of an intermediate polarization phase observed in experiments.
  • The study provides insights into the ground state properties of real spin-ice systems.

Conclusions:

  • Lattice distortions play a crucial role in spin-ice physics, potentially preserving frustration effects rather than relieving them.
  • A revised understanding of the spin-ice Hamiltonian is necessary for accurately describing experimental phenomena.