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  Broadband terahertz spectroscopy of the insulator-metal transition driven by coherent lattice deformation at the SmNiO3/LaAlO3 interface

Hu, W., Catalano, S., Gibert, M., Triscone, J.-.-M., & Cavalleri, A. (2016). Broadband terahertz spectroscopy of the insulator-metal transition driven by coherent lattice deformation at the SmNiO3/LaAlO3 interface. Physical Review B, 93(16): 161107. doi:10.1103/PhysRevB.93.161107.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-1E4C-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E5E2-D
Genre: Journal Article

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http://arxiv.org/abs/1602.09026 (Preprint)
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http://dx.doi.org/10.1103/PhysRevB.93.161107 (Publisher version)
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 Creators:
Hu, Wanzheng1, 2, Author              
Catalano, S.3, Author
Gibert, M.3, Author
Triscone, J. -M.3, Author
Cavalleri, Andrea1, 2, 4, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Center for Free-Electron Laser Science, 22761 Hamburg, Germany, ou_persistent22              
3Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland, ou_persistent22              
4Department of Physics, Clarendon Laboratory, University of Oxford, OX1 3PU Oxford, United Kingdom, ou_persistent22              

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Free keywords: Condensed Matter; Strongly Correlated Electrons
 Abstract: We investigate the nonequilibrium insulator-metal transition driven in a SmNiO3 thin film by coherent optical excitation of the LaAlO3 substrate lattice. By probing the transient optical properties over a broad frequency range (100 - 800 cm-1), we analyze both the time-dependent metallic plasma and the infrared optical phonon line shapes. We show that the light-induced metallic phase in SmNiO3 has the same carrier density as the equilibrium metallic phase. We also report that the LaAlO3 substrate acts as a transducer only at the earlier time delays, as the vibrations are driven coherently. No long-lived structural rearrangement takes place in the substrate. Finally, we show that the transient insulator-metal transition occurs both below and above the Néel temperature. We conclude that the supersonic melting of magnetic order measured with ultrafast x rays is not the driving force of the formation of the metallic phase. We posit that the insulator-metal transition may origin from the rearrangement of ordered charges at the interface propagating into the film.

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Language(s): eng - English
 Dates: 2016-02-292016-03-282016-02-292016-04-122016-04-15
 Publication Status: Published in print
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1602.09026
DOI: 10.1103/PhysRevB.93.161107
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 93 (16) Sequence Number: 161107 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008