磁相变中的热力学涨落：作为原型的因瓦合金
Thermodynamic Fluctuations in Magnetic Phase Transition: Invar as a Prototype
摘要：
我们提出了自旋涨落系统的第一性原理公式，并将其应用于有序Fe3Pt，揭示了因瓦异常，包括负热膨胀和自发磁化.该理论一致地预测了完全铁磁组态和自旋翻转组态之间的有限温度混合。我们还发现了一个三临界点，在高温下的二阶相变，完全铁磁配置和自旋翻转配置之间，成为一阶在低温下。
英文摘要：
We propose a first-principles formulism for system with spin fluctuations and apply it to the ordered Fe3Pt to uncover the Invar anomalies, including negative thermal expansion and spontaneous magnetization. The theory has coherently predicted the finite temperature intermixing between the fully ferromagnetic configuration and the spin-flipping configurations. We also discover a tri-critical point at which a high-temperature second-order phase transition, between the fully ferromagnetic configuration and the spin-flipping configurations, becomes first-order at low temperatures.
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