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Dynamic surface modification due to effusion of Na in Na2IrO3

Publication ,  Journal Article
Vasdev, A; Yadav, L; Kamboj, S; Mehlawat, K; Singh, Y; Sheet, G
Published in: Journal of Applied Physics
August 7, 2018

The honeycomb lattice iridate Na2IrO3 shows frustrated magnetism and can potentially display Kitaev-like exchange interactions. Recently, it was shown that the electronic properties of the surface of crystalline Na2IrO3 can be tuned by Ar plasma treatment in a controlled manner, leading to various phases of matter ranging from a fully gapped to a metallic surface, where the possibility of a charge-density wave like transition has been suggested. Here, through direct imaging with an atomic force microscope (AFM) in air, we show that the surface of crystalline Na2IrO3 evolves rapidly as elemental Na effuses out of the interleave planes to the surface and undergoes sublimation, thereby disappearing from the surface gradually over time. Using conductive AFM, we recorded a series of topographs and surface current maps simultaneously and found that the modification of the surface leads to change in the electronic properties in a dynamic fashion until the whole system reaches a dynamic equilibrium. These observations are important in the context of the exotic electronic and magnetic properties that the surface of Na2IrO3 displays.

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Published In

Journal of Applied Physics

DOI

EISSN

1089-7550

ISSN

0021-8979

Publication Date

August 7, 2018

Volume

124

Issue

5

Publisher

AIP Publishing

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Vasdev, A., Yadav, L., Kamboj, S., Mehlawat, K., Singh, Y., & Sheet, G. (2018). Dynamic surface modification due to effusion of Na in Na2IrO3. Journal of Applied Physics, 124(5). https://doi.org/10.1063/1.5030606
Vasdev, Aastha, Lalit Yadav, Suman Kamboj, Kavita Mehlawat, Yogesh Singh, and Goutam Sheet. “Dynamic surface modification due to effusion of Na in Na2IrO3.” Journal of Applied Physics 124, no. 5 (August 7, 2018). https://doi.org/10.1063/1.5030606.
Vasdev A, Yadav L, Kamboj S, Mehlawat K, Singh Y, Sheet G. Dynamic surface modification due to effusion of Na in Na2IrO3. Journal of Applied Physics. 2018 Aug 7;124(5).
Vasdev, Aastha, et al. “Dynamic surface modification due to effusion of Na in Na2IrO3.” Journal of Applied Physics, vol. 124, no. 5, AIP Publishing, Aug. 2018. Crossref, doi:10.1063/1.5030606.
Vasdev A, Yadav L, Kamboj S, Mehlawat K, Singh Y, Sheet G. Dynamic surface modification due to effusion of Na in Na2IrO3. Journal of Applied Physics. AIP Publishing; 2018 Aug 7;124(5).

Published In

Journal of Applied Physics

DOI

EISSN

1089-7550

ISSN

0021-8979

Publication Date

August 7, 2018

Volume

124

Issue

5

Publisher

AIP Publishing

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences