Scaling of the magnetic entropy change in skyrmion material Fe0:5Co0:5Si
Scaling of the magnetic entropy change in skyrmion material Fe0:5Co0:5Si
The magnetic entropy change [ΔSM(T;H)] around the phase transition temperature TC is investigatedby the scaling method for Fe0:5Co0:5Si, which exhibits a skyrmion phase below TC. Theparameters of ΔSM(T;H) exhibit field dependent behaviors. The ΔSM(T;H) curves under highfield can be well scaled into a single universal curve independent of external field and temperature.However, ΔSM(T;H) curves under low field become divergent just below TC, which indicates acharacteristic of first-order transition. The scaling investigation of ΔSM(T;H) curves indicatesthat the phase transition in Fe0:5Co0:5Si is of a weak first-order type in low field region, while it isdriven into a second-order one under high field. This weak first-order phase transition in low fieldregion resembles that in typical skyrmion system MnSi which is caused by the critical fluctuation.The result suggests that critical fluctuation plays an important role in the phase transition andformation of skyrmion state.
he magnetic entropy change [SM(T;H)] around the phase transition temperature TC is investigatedby the scaling method for Fe0:5Co0:5Si, which exhibits a skyrmion phase below TC. Theparameters of SM(T;H) exhibit field dependent behaviors. The SM(T;H) curves under highfield can be well scaled into a single universal curve independent of external field and temperature.However, SM(T;H) curves under low field become divergent just below TC, which indicates acharacteristic of first-order transition. The scaling investigation of SM(T;H) curves indicatesthat the phase transition in Fe0:5Co0:5Si is of a weak first-order type in low field region, while it isdriven into a second-order one under high field. This weak first-order phase transition in low fieldregion resembles that in typical skyrmion system MnSi which is caused by the critical fluctuation.The result suggests that critical fluctuation plays an important role in the phase transition andformation of skyrmion state.
物理学
magnetic entropy changescalingfirst-order phase transitionuniversal curve
.Scaling of the magnetic entropy change in skyrmion material Fe0:5Co0:5Si[EB/OL].(2017-11-27)[2025-08-18].https://chinaxiv.org/abs/201711.02792.点此复制
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