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A charge density wave-like instability in a doped spin-orbit assisted weak Mott insulator

Chu, H. and Zhao, L. and de la Torre, A. and Hogan, T. and Wilson, S. D. and Hsieh, D. (2017) A charge density wave-like instability in a doped spin-orbit assisted weak Mott insulator. Nature Materials, 16 (2). pp. 200-203. ISSN 1476-1122. doi:10.1038/NMAT4836.

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Layered perovskite iridates realize a rare class of Mott insulators that are predicted to be strongly spin–orbit coupled analogues of the parent state of cuprate high-temperature superconductors. Recent discoveries of pseudogap, magnetic multipolar ordered6 and possible d-wave superconducting phases in doped Sr_2IrO_4 have reinforced this analogy among the single layer variants. However, unlike the bilayer cuprates, no electronic instabilities have been reported in the doped bilayer iridate Sr_3Ir_2O_7. Here we show that Sr_3Ir_2O_7 realizes a weak Mott state with no cuprate analogue by using ultrafast time-resolved optical reflectivity to uncover an intimate connection between its insulating gap and antiferromagnetism. However, we detect a subtle charge density wave-like Fermi surface instability in metallic electron doped Sr_3Ir_2O_7 at temperatures (T_(DW)) close to 200 K via the coherent oscillations of its collective modes, which is reminiscent of that observed in cuprates. The absence of any signatures of a new spatial periodicity below T_(DW) from diffraction, scanning tunnelling and photoemission based probes suggests an unconventional and possibly short-ranged nature of this density wave order.

Item Type:Article
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Chu, H.0000-0002-1989-9517
Hsieh, D.0000-0002-0812-955X
Additional Information:© 2017 Macmillan Publishers Limited. Received 10 May 2016; Accepted 21 November 2016; Published online 16 January 2017. We thank V. Madhavan and Z. Wang for providing scanning tunnelling microscopy data and analysis on (Sr_(1−x)La_x)_3Ir_2O_7 samples and for helpful discussions. This work is supported by a GIST-Caltech Collaboration Grant and by ARO Grant W911NF-13-1-0059. Instrumentation was partially supported by ARO DURIP Award W911NF-13-1-0293. D.H. acknowledges funding provided by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (PHY-1125565) with support of the Gordon and Betty Moore Foundation through Grant GBMF1250. S.D.W. acknowledges support under NSF award No. DMR-1505549 as well as partial support from the MRSEC Program of the National Science Foundation under Award No. DMR 1121053 (T.H.). Author Contributions: H.C., L.Z. and D.H. planned the experiment. H.C. performed the measurements. H.C., A.d.l.T., D.H. and L.Z. analysed the data. T.H. and S.D.W. prepared and characterized the samples and performed RIXS measurements. H.C. and D.H. wrote the manuscript. Data availability. The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request. The authors declare no competing financial interests.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
GIST-Caltech CollaborationUNSPECIFIED
Army Research Office (ARO)W911NF-13-1-0059
Army Research Office (ARO)W911NF-13-1-0293
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationGBMF1250
Issue or Number:2
Record Number:CaltechAUTHORS:20161110-133754241
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71917
Deposited By: Katherine Johnson
Deposited On:25 Jan 2017 00:12
Last Modified:11 Nov 2021 04:53

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