Novel Jeff=1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4

B. J. Kim, Hosub Jin, S. J. Moon, J.-Y. Kim, B.-G. Park, C. S. Leem, Jaejun Yu, T. W. Noh, C. Kim, S.-J. Oh, J.-H. Park, V. Durairaj, G. Cao, and E. Rotenberg
Phys. Rev. Lett. 101, 076402 – Published 15 August 2008

Abstract

We investigated the electronic structure of 5d transition-metal oxide Sr2IrO4 using angle-resolved photoemission, optical conductivity, x-ray absorption measurements, and first-principles band calculations. The system was found to be well described by novel effective total angular momentum Jeff states, in which the relativistic spin-orbit coupling is fully taken into account under a large crystal field. Despite delocalized Ir 5d states, the Jeff states form such narrow bands that even a small correlation energy leads to the Jeff=1/2 Mott ground state with unique electronic and magnetic behaviors, suggesting a new class of Jeff quantum spin driven correlated-electron phenomena.

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  • Received 23 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.076402

©2008 American Physical Society

Authors & Affiliations

B. J. Kim1, Hosub Jin1, S. J. Moon2, J.-Y. Kim3, B.-G. Park4, C. S. Leem5, Jaejun Yu1, T. W. Noh2, C. Kim5, S.-J. Oh1, J.-H. Park3,4,*, V. Durairaj6, G. Cao6, and E. Rotenberg7

  • 1School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  • 2ReCOE & School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  • 3Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 4eSSC & Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 5Institute of Physics and Applied Physics, Yonsei University, Seoul, Korea
  • 6Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
  • 7Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 96720, USA

  • *Author to whom all correspondence should be addressed. jhp@postech.ac.kr

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Vol. 101, Iss. 7 — 15 August 2008

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