Magnetic ground state of Sr2IrO4 and implications for second-harmonic generation

Di Matteo, S.; Norman, M. R.

doi:10.1103/PhysRevB.94.075148

Title: Magnetic ground state of ${Sr}_{2} {IrO}_{4}$ and implications for second-harmonic generation

Journal Article · Wed Aug 24 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.075148· OSTI ID:1352667

Di Matteo, S. ^[1]; Norman, M. R. ^[2]

Univ. of Rennes 1 (France). Inst. of Physics of Rennes. Dept. of Materials and Nanoscience
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division

The currently accepted magnetic ground state of Sr₂IrO₄ (the -++- state) preserves inversion symmetry. This is at odds, though, with recent experiments that indicate a magnetoelectric ground state, leading to the speculation that orbital currents or more exotic magnetic multipoles might exist in this material. In this paper, we analyze various magnetic configurations and demonstrate that two of them, the magnetoelectric -+-+ state and the nonmagnetoelectric ++++ state, can explain these recent second-harmonic generation (SHG) experiments, obviating the need to invoke orbital currents. The SHG-probed magnetic order parameter has the symmetry of a parity-breaking multipole in the -+-+ state and of a parity-preserving multipole in the ++++ state. We speculate that either might have been created by the laser pump used in the experiments. An alternative is that the observed magnetic SHG signal is a surface effect. Finally, we suggest experiments that could be performed to test these various possibilities and also address the important issue of the suppression of the RXS intensity at the L₂ edge.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Organization:: Univ. of Rennes 1 (France)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1352667

Alternate ID(s):: OSTI ID: 1305442

Journal Information:: Physical Review B, Vol. 94, Issue 7; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Title: Magnetic ground state of ${Sr}_{2} {IrO}_{4}$ and implications for second-harmonic generation