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Possible Quantum Paramagnetism in Compressed Sr_{2}IrO_{4}.

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|February 29, 2020
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Compression alters the magnetic structure of strontium iridate (Sr_{2}IrO_{4}), inducing phase transitions and a highly frustrated magnetic state. Novel quantum paramagnetic phases may emerge under high pressure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Sr_{2}IrO_{4} is an insulator with a J_{eff}=1/2 magnetic moment arising from strong spin-orbit coupling.
  • Its magnetic ground state is characterized by weak interlayer exchange coupling between 2D IrO_{2} layers.

Purpose of the Study:

  • To investigate the impact of hydrostatic pressure on the magnetic ground state of Sr_{2}IrO_{4}.
  • To understand how compression modifies magnetic interactions and structures in this material.

Main Methods:

  • X-ray resonant techniques were employed within a diamond anvil cell to apply and control pressure.
  • Magnetic structures and phase transitions were probed under varying pressure conditions.

Main Results:

  • Compression modifies the interlayer exchange coupling, leading to a magnetic structure crossover around 7 GPa.
  • An order-disorder magnetic phase transition occurs at higher pressures (17-20 GPa).
  • Strong intralayer exchange interactions persist up to 35 GPa, indicating a highly frustrated magnetic state.

Conclusions:

  • Hydrostatic pressure is a powerful tool to tune the magnetic properties of Sr_{2}IrO_{4}.
  • The observed magnetic behavior suggests the potential for realizing novel quantum paramagnetic phases with entangled spin-orbital degrees of freedom.