Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework
In: Physical Review B, Jg. 107 (2023-02-01), Heft 7
Online
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- 075104
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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Emergent quasi-two-dimensional metallic state derived from the Mott-insulator framework
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Autor/in / Beteiligte Person: | Chiang, P-C ; Lin, SC ; Chiang, C-Y ; Ku, C-S ; Huang, SW ; Lee, JM ; Chuang, Y-D ; Lin, HJ ; Liao, YF ; Cheng, C-M ; Haw, SC ; Chen, JM ; Chu, Y-H ; H., T ; Luo, C-W ; Juang, J-Y ; Wu, KH ; Chang, Y-W ; Yang, J-C ; Lin, J-Y |
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Zeitschrift: | Physical Review B, Jg. 107 (2023-02-01), Heft 7 |
Veröffentlichung: | eScholarship, University of California, 2023 |
Medientyp: | academicJournal |
Umfang: | 075104 |
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