We study the influence of spinless impurities on a frustrated magnet featuring a spin-density wave (stripe) phase by means of Monte Carlo simulations. We demonstrate that the interplay between the impurities and an order parameter that breaks a real-space symmetry triggers the emergence of a random-field mechanism which destroys the stripe-ordered phase. Importantly, the strength of the emerging random fields can be tuned by the repulsion between the impurity atoms; they vanish for perfect anticorrelations between neighboring impurities. This provides a way of controlling the phase diagram of a many-particle system. In addition, we also investigate the effects of the impurities on the character of the phase transitions between the stripe-ordered, ferromagnetic, and paramagnetic phases.
S. S. Kunwar et al., "Tuning a Random-Field Mechanism in a Frustrated Magnet," Physical Review B, vol. 98, no. 2, American Physical Society (APS), Jul 2018.
The definitive version is available at https://doi.org/10.1103/PhysRevB.98.024206
Center for High Performance Computing Research
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01 Jul 2018