Manipulation of electronic phases in Au-nanodots-decorated manganite films by laser illumination

Hui Li, Kaixuan Zhang, Dongli Wang, Han Xu, Haibiao Zhou, Xiaodong Fan, Guanghui Cheng, Long Cheng, Qingyou Lu, Lin Li, Changgan Zeng

Research output: Contribution to journalArticlepeer-review

Abstract

Precise manipulation of the electronic phases in strongly correlated oxides offers an avenue to control the macroscopic functionalities, thereby sparking enormous research interests in condensed matter physics. In the present paper, phase-separated La0.33Pr0.34Ca0.33MnO3 (LPCMO) thin films with a fraction of the ferromagnetic metallic phase close to the percolation threshold are successfully prepared, in which the nonvolatile and erasable switching between different electronic states is realized through cooperative effects of Au-nanodots capping and laser illumination. The deposition of Au nanodots on LPCMO thin films leads to the occurrence of a thermally inaccessible nonpercolating state at low temperatures, manifested as the absence of insulator-metal transition as temperature decreases. Such a nonpercolating state can be substantially tuned back to a percolating state by laser illumination in a nonvolatile and erasable way, accompanied by gigantic resistance drops in a wide temperature range. The formation of local oxygen vacancies near Au nanodots and thereby the modulation of mesoscopic electronic texture should be the key factor for the realization of flexible modulation of global transport properties in LPCMO thin films. Our findings pave a way toward the manipulation of physical properties of the electronically phase-separated systems and the design of optically controlled electronic devices.

Original languageEnglish
Article number064403
JournalPhysical Review Materials
Volume2
Issue number6
DOIs
Publication statusPublished - 2018 Jun 6
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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