Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.226402
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Funding
- MOST/KOSEF
- KOSEF [ARP R17-2008-033-01000-0]
- Schweizer Nationalfonds [200020-119784]
- Soongsil University Research Fund
- MOST
- POSTECH
- National Research Foundation of Korea [R16-2000-001-01001-0, 2008-06529] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigated the electronic structures of the 5d Ruddlesden-Popper series Srn+1IrnO3n+1 (n=1, 2, and infinity) using optical spectroscopy and first-principles calculations. As 5d orbitals are spatially more extended than 3d or 4d orbitals, it has been widely accepted that correlation effects are minimal in 5d compounds. However, we observed a Mott insulator-metal transition with a change of bandwidth as we increased n. In addition, the artificially synthesized perovskite SrIrO3 showed a very large mass enhancement of about 6, indicating that it was in a correlated metallic state.
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