用Grueneisen方法从超快X射线衍射数据实验测定瞬态自旋和声子能量：钆
Grueneisen-Approach for the Experimental Determination of Transient Spin and Phonon Energies from Ultrafast X-ray Diffraction Data: Gadolinium
摘要：
我们以钆薄膜为模型系统研究具有负热膨胀的铁磁体。超短激光脉冲加热电子子系统，我们通过超快X射线衍射跟踪瞬态应变。根据一个简单的Grueneisen方法的应变分解成两个贡献成正比的热能的自旋和声子子系统。我们的分析表明，在飞秒激光激发声子和自旋可以驱动的热平衡几纳秒。
英文摘要：
We study gadolinium thin films as a model system for ferromagnets with negative thermal expansion. Ultrashort laser pulses heat up the electronic subsystem and we follow the transient strain via ultrafast X-ray diffraction. In terms of a simple Grueneisen approach the strain is decomposed into two contributions proportional to the thermal energy of spin and phonon subsystems. Our analysis reveals that upon femtosecond laser excitation phonons and spins can be driven out of thermal equilibrium for several nanoseconds.
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