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Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework

Chiang, P. C. ; Lin, S. C. ; Chiang, C. Y. ; Ku, C. S. ; Huang, S. W. LU ; Lee, J. M. LU ; Chuang, Y. D. ; Lin, H. J. ; Liao, Y. F. and Cheng, C. M. , et al. (2023) In Physical Review B 107(7).
Abstract

Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped... (More)

Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
107
issue
7
article number
075104
publisher
American Physical Society
external identifiers
  • scopus:85148331755
ISSN
2469-9950
DOI
10.1103/PhysRevB.107.075104
language
English
LU publication?
yes
id
09005641-5cde-467c-b4df-aae5076c79f9
date added to LUP
2023-03-03 13:47:25
date last changed
2023-03-03 13:47:25
@article{09005641-5cde-467c-b4df-aae5076c79f9,
  abstract     = {{<p>Recent quasi-two-dimensional (quasi-2D) systems with judicious exploitation of the atomic monolayer or few-layer architecture exhibit unprecedented physical properties that challenge the conventional wisdom on condensed matter physics. Here we show that the infinite layer SrCuO2 (SCO), a topical cuprate Mott insulator in bulk form, can manifest an unexpected metallic state in the quasi-2D limit when SCO is grown on TiO2-terminated SrTiO3 (STO) substrates. The sheet resistance does not conform to Landau's Fermi liquid paradigm. Hard x-ray core-level photoemission spectra demonstrate a definitive Fermi level that resembles the hole doped metal. Soft x-ray absorption spectroscopy also reveals features analogous to those of a hole doped Mott insulator. Based on these results, we conclude that the hole doping does not occur at the interfaces between SCO and STO; instead, it comes from the transient layers between the chain-type and the planar-type structures within the SCO slab. The present work reveals a metallic state in the infinite layer SCO and invites further examination to elucidate the spatial extent of this state.</p>}},
  author       = {{Chiang, P. C. and Lin, S. C. and Chiang, C. Y. and Ku, C. S. and Huang, S. W. and Lee, J. M. and Chuang, Y. D. and Lin, H. J. and Liao, Y. F. and Cheng, C. M. and Haw, S. C. and Chen, J. M. and Chu, Y. H. and Do, T. H. and Luo, C. W. and Juang, J. Y. and Wu, K. H. and Chang, Y. W. and Yang, J. C. and Lin, J. Y.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.107.075104}},
  doi          = {{10.1103/PhysRevB.107.075104}},
  volume       = {{107}},
  year         = {{2023}},
}