Photoinduced structural recovery dynamics of rare-earth nickelate thin films
Jugal Mehta, Scott Smith, Jianheng Li, Kenneth Ainslie, Nadia Albayati, Toyanath Joshi, Pooja Rao, Yu-Hsing Cheng, Spencer Jeppson, Rahul Jangid, Evguenia Karapetrova, Donald A. Walko, Haidan Wen, David Lederman, Roopali Kukreja
DOI 10.1103/PhysRevMaterials.7.096201 · Physical Review Materials
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Abstract
Photoinduced structural dynamics of rare-earth nickelate thin films, NdNiO3 and SmNiO3, grown on (001) oriented SrTiO3 were studied using time-resolved x-ray diffraction. The evolution of the (002) Bragg peak was tracked following laser excitation. The recovery pathways were found to be strongly dependent on laser fluence for NdNiO3 and distinct for the two rare-earth nickelates. The recovery of the (002) peak shifts was modeled using a one-dimensional thermal diffusion model which showed that the recovery processes are nonthermal at high fluences. For NdNiO3, the timescales for the recovery of the (002) peak shift were found to be closely related to Ni magnetism recovery, potentially indicating magnetostructural coupling. Moreover, the evolution of integrated intensity and full width at half maximum points towards the presence of a structural phase separation during recovery. Our studies highlight structural recovery pathways in nickelates by comparing the distinct responses of the photoinduced metal-insulator transition in NdNiO3 and SmNiO3.
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