Adiabatic pulsed-field dynamics of a frustrated spin-lattice system

Hidemaro Suwa

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arXiv · 2611.01223

Adiabatic pulsed-field dynamics of a frustrated spin-lattice system

Hidemaro Suwa

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Abstract

Magnetocaloric measurements in pulsed magnetic fields probe competing phases through the coupled evolution of magnetization and temperature. We formulate an adiabatic classical spin-lattice simulation that treats bond and site optical coordinates explicitly while representing the remaining thermal degrees of freedom by a finite internal reservoir. Magnetic work and energy exchange determine its temperature along each trajectory, providing feedback to the Langevin dynamics without external heat flow. Applied to a pyrochlore exchange-striction model motivated by CdCr$_2$O$_4$, the method produces a half-magnetization plateau, cooling near its onset, a temperature dome, and a change in cooling slope near plateau exit. Their joint emergence without an imposed temperature profile captures the experimental sequence of magnetic and thermal features. An approximate magnetization crossing near the temperature maximum is consistent with the reversible thermodynamic interpretation of the dome. The phenomenological reservoir enables this qualitative comparison within a simple model.

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Hidemaro Suwa. 2026-10-31. Adiabatic pulsed-field dynamics of a frustrated spin-lattice system. https://arxiv.org/abs/2611.01223

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