Disentangling heterogeneity and disorder during ultrafast surface melting of orbital order
2024-07-03
状态已发表
摘要

Understanding how light modifies long-range order is key to improve our ability to control material functionality on an ultrafast timescale. Transient spatial heterogeneity has been proposed in many materials, but isolating the dynamics of different regions experimentally has been challenging. Here we address this issue and measure the dynamics of orbital order melting in the layered manganite, La0.5Sr1.5MnO4, and isolate the surface dynamics from the bulk for the first time. Bulk measurements show orbital order is rapidly suppressed, but the correlation length surprisingly increases. However, the surface dynamics, show a stronger suppression and a significant decrease in correlation length. By isolating the surface changes, we find that light preferentially melts a less ordered surface and the loss of long-range order is likely driven by the formation of local and disordered polarons. Melting the disordered surface effectively increases the average correlation of the bulk probed volume, resolving the contradictory response. These results show that surface scattering methods are necessary to understand both surface and bulk dynamics in heterogeneous materials.

DOIarXiv:2407.03013
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出处Arxiv
WOS记录号PPRN:90686807
WOS类目Physics, Condensed Matter
文献类型预印本
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/404291
专题物质科学与技术学院
大科学中心_PI研究组_柳学榕组
通讯作者Liu, Xuerong
作者单位
1.Aarhus Univ, Dept Phys & Astron, Aarhus, Denmark
2.Le Mans Univ, Inst Mol & Materiaux Mans, UMR CNRS 6283, F-72085 Le Mans, France
3.ALBA Synchrotron Light Source, Barcelona, Spain
4.Aarhus Univ, Dept Chem, Aarhus, Denmark
5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
6.Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
7.Paul Scherrer Inst, Swiss Light Source, Villigen, Switzerland
8.ShanghaiTech Univ, Ctr Transformat Sci, Shanghai 201210, Peoples R China
推荐引用方式
GB/T 7714
Monti, Maurizio,Siddiqui, Khalid M.,Perez-Salinas, Daniel,et al. Disentangling heterogeneity and disorder during ultrafast surface melting of orbital order. 2024.
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