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首页> 外文期刊>Physical review >Laser-induced coherent acoustical phonons mechanisms in the metal-insulator transition compound NdNiO_3:Thermal and nonthermal processes
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Laser-induced coherent acoustical phonons mechanisms in the metal-insulator transition compound NdNiO_3:Thermal and nonthermal processes

机译：金属-绝缘体过渡化合物NdNiO_3中的激光诱导相干声子机理：热过程和非热过程

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摘要

Coherent acoustic phonon generation processes on the picosecond time scale were investigated in the metal-insulator transition compound NdNiO_3. Time-resolved optical pump-probe methods were employed. While at high temperature thermoelastic process drives the photogeneration of acoustic phonons, an additional contribution can be identified when the transition to the insulating state at T < T_(MI) takes place. The latter additional photogenerated stress is possibly of electronic stress nature (deformation-potential mechanism). We show that it competes with thermoelastic stress, leading to reduction in the magnitude of a photogenerated-acoustic phonon pulse. In that insulating state, we suggest that the electron-phonon deformation-potential coupling in NdNiO_3 leads to a laser-induced lattice cell volume contraction. Furthermore, in the temperature range where a first-order phase transition takes place and where both metallic and insulating metastable phases coexist, the photogenerated ultrashort picosecond acoustic pulse magnitude cannot be described by a classical thermoelastic process. We suggest that such a phenomenon is connected to unusual thermoelasticity in a metastable state. In particular, we discuss the definition of the thermal-expansion coefficient of solid's in a metastable state subjected to ultrafast optical excitation.
机译：在金属-绝缘体过渡化合物NdNiO_3中研究了皮秒级时相干声子的产生过程。采用时间分辨光学泵浦探测方法。在高温下，热弹性过程驱动声子的光生，但当在T

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