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Order by Quenched Disorder in the Model Triangular Antiferromagnet RbFe(MoO_{4})_{2}.

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|January 18, 2018
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This summary is machine-generated.

Doping RbFe(MoO_{4})_{2} disrupts its magnetic order, revealing impurity effects on frustrated magnets. Structural disorder introduces new magnetic interactions, impacting the ground state.

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Area of Science:

  • Condensed Matter Physics
  • Magnetism
  • Materials Science

Background:

  • The triangular lattice antiferromagnet RbFe(MoO_{4})_{2} exhibits complex magnetic behavior due to geometric frustration.
  • Understanding the interplay between disorder and magnetic interactions is crucial for designing novel magnetic materials.

Purpose of the Study:

  • To investigate the impact of moderate doping on the magnetic properties and ground state of RbFe(MoO_{4})_{2}.
  • To elucidate the role of structural disorder in modifying magnetic configurations and exchange interactions.

Main Methods:

  • Experimental synthesis and characterization of doped RbFe(MoO_{4})_{2} samples.
  • Magnetic measurements to observe changes in magnetization and magnetic structure.

Main Results:

  • Disappearance of the 1/3 magnetization plateau in doped samples.
  • Observation of a striking change in the magnetic configuration, favoring a less collinear state.
  • Identification of an effective positive biquadratic exchange interaction induced by structural disorder.

Conclusions:

  • Doping-induced random impurity potentials lift the degeneracy of mean-field ground states, influencing magnetic ordering.
  • Structural disorder plays a significant role in determining the ground state of frustrated magnetic systems.
  • The study highlights the competition between thermal and structural disorder in magnetic materials.