Dynamic change in light-regulated hardness in SrTiO3

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Author list: Nammahachak, N.; Sriondee, M.; Eknapakul, T.; Rattanachata, A.; Nakajima, H.; Best, J.P.; Meevasana, W.; Triamnak, N.; Ratanaphan, S.

Publisher: American Institute of Physics

Publication year: 2025

Journal: Applied Physics Letters (0003-6951)

Volume number: 127

Issue number: 17

Start page: 171602

ISSN: 0003-6951

eISSN: 1077-3118

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-105019788869&doi=10.1063%2F5.0283875&partnerID=40&md5=c71a2601cb68618d01c1ecc663c49ff1

Languages: English-Great Britain (EN-GB)

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Abstract

We report our discovery of the dynamic change in light-regulated hardness in an SrTiO3 single crystal. Vickers hardness and atomic force microscope measurements reveal that the hardness is surprisingly increased and decreased with on and off irradiation for a (110), but unchanged for a (100) oriented single crystal. The dynamic change of light-regulated hardness is primarily governed by a higher concentration of photo-induced oxygen vacancies in the (110) crystal compared to the (100), as revealed by photoelectron spectroscopy. This work provides an undiscovered route toward controlling the dynamic change of hardness, which may offer alternative strategies to tune the localized deformations in polycrystalline metal oxides. © 2025 Author(s).

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