Tuning a random-field mechanism in a frustrated magnet

Article

关键词: 1ST-ORDER PHASE-TRANSITIONS;    MONTE-CARLO;    CRITICAL-BEHAVIOR;    QUENCHED DISORDER;    SYSTEMS;    MODEL;    SUPERCONDUCTORS;    QUANTUM;    FLUIDS;    STATE;   

DOI  :  10.1103/PhysRevB.98.024206

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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