Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet

Kim, Y. K.; Krupin, O.; Denlinger, Jonathan D.; Bostwick, Aaron; Rotenberg, Eli; Zhao, Qingbiao; Mitchell, J. F.; Allen, J. W.; Kim, B. J.

doi:10.1126/science.1251151

Cited by 307 publications

(311 citation statements)

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“…Above this temperature, the d-wave gap evolves into a pseudogap, in striking parallel with the cuprates 12,16 . However, because of the inherently surface sensitive nature of the technique used to dope the sample in these studies, involving in situ deposition of alkali metal atoms on the surface of undoped Sr 2 IrO 4 , it remains unclear at this point whether the dwave gap originates from superconductivity without evidence from bulk measurements.…”

Section: Introductionmentioning

confidence: 89%

“…Experimentally, it has been confirmed that the canted antiferromagnetic structure of Sr 2 IrO 4 derives from a predominantly isotropic nearest-neighbor magnetic exchange coupling [8][9][10] . Thus, Sr 2 IrO 4 becomes the first non-cuprate material to realize a (iso)spin-1/2 Heisenberg antiferromagnet in a quasitwo-dimensional square lattice-a possible platform for high temperature superconductivity [11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…La-doped Sr 2 IrO 4 single crystals have only become available in the last couple of years [21][22][23] , but angle-resolved photoemission studies on them 21,22 do not fully reproduce the observations made via the in situ doping method 12,16 . While it is unclear at the moment what leads to such differences between the two doping methods, we note that a well-defined quasiparticle peak is absent for any doping level in La-doped samples, indicating suppressed coherent motion of doped electrons presumably due to disorder created by chemical doping.…”

Section: Introductionmentioning

confidence: 99%

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Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Sung

Gretarsson

Proepper

et al. 2016

Philosophical Magazine

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We report on the growth of stoichiometric Sr2IrO4 single crystals, which allow us to unveil their intrinsic magnetic properties. The effect of different growth conditions has been investigated for crystals grown by the flux method. We find that the magnetic response depends very sensitively on the details of the growth conditions. We assess the defect concentration based on magnetization, X-ray diffraction, Raman scattering, and optical conductivity measurements. We find that samples with a low concentration of electronically active defects show much reduced in-gap spectral weight in the optical conductivity and a pronounced two-magnon peak in the Raman scattering spectrum. A prolonged exposure at high temperature during the growth leads to higher defect concentration likely due to creation of oxygen vacancies. We further demonstrate a systematic intergrowth of Sr2IrO4 and Sr3Ir2O7 phases by varying the growth temperature. Our results thus emphasize that revealing the intrinsic magnetic properties of Sr2IrO4 and related materials requires a scrupulous control of the crystal growth process.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Sung

Gretarsson

Proepper

et al. 2016

Philosophical Magazine

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“…For Rh substitutions, which results in effective hole doping 13 , a metallic-like state was observed, albeit with residual pseudogaps instead of well defined quasiparticles (QP) peaks 14 . Another kind of metallic state was observed by evaporating K on the surface of Sr 2 IrO 4 , which presumably dopes electrons into it 15 . In this case, well defined QP were observed, with strong momentum and temperature dependences that resemble those found in the cuprates and even possible signs of superconductivity 16,17 4 18 .…”

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confidence: 99%

“…In the case of surface doped Sr 2 IrO 4 (which yields electron doping, like La), a good metallic state, with well defined QP and circular FS, seems to be realized 15 . Interestingly, the position of the J=3/2 band in this study is back to its original position near -0.5eV (see Fig.…”

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Transfer of spectral weight across the gap ofSr2IrO4induced by La doping

et al. 2015

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We study with Angle Resolved PhotoElectron Spectroscopy (ARPES) the evolution of the electronic structure of Sr2IrO4, when holes or electrons are introduced, through Rh or La substitutions. At low dopings, the added carriers occupy the first available states, at bottom or top of the gap, revealing an asymmetric gap of 0.7eV, in good agreement with STM measurements. At further doping, we observe a reduction of the gap and a transfer of spectral weight across the gap, although the quasiparticle weight remains very small. We discuss the origin of the in-gap spectral weight as a local distribution of gap values.PACS numbers: 71.30.-h, 71.27.-a, 79.60.-i The reaction of an insulator to doping can reveal many things on its underlying structure. For a band insulator, a simple shift of the chemical potential into bands that were previously completely filled or empty can be expected. If more complex electronic correlations are involved, the formation of in-gap states and/or large transfer of spectral weight across the gap could occur 1,2 . This problem received a lot of attention in the case of cuprates 3,4 . It is very interesting to investigate this in Sr 2 IrO 4 , whose insulating nature is not completely understood. The idea driving the field for a few years is that strong spin-orbit coupling reshapes the electronic structure in a way that enhances correlations 5 . Especially, a narrow half-filled band of J=1/2 character forms at the Fermi level, which could be split by correlations to form a Mott insulator. The exact role of the antiferromagnetic (AF) ordering observed below 240 K 6 in the insulating nature is still debated 7,8 . On the other hand, applying pressure, even up to 55 GPa, was not able to close the gap 9 , which is surprising for a Mott insulator. In this context, it would be interesting to know more about the electronic structure of doped phases, which exhibit metallic-like behaviors even for rather low doping rates 10-13 .Recently, a few Angle Resolved Photoemission (ARPES) studies of doped iridate phases were reported, but they lead to quite a confusing picture. For Rh substitutions, which results in effective hole doping 13 , a metallic-like state was observed, albeit with residual pseudogaps instead of well defined quasiparticles (QP) peaks 14 . Another kind of metallic state was observed by evaporating K on the surface of Sr 2 IrO 4 , which presumably dopes electrons into it 15 . In this case, well defined QP were observed, with strong momentum and temperature dependences that resemble those found in the cuprates and even possible signs of superconductivity 16,17 . Very recently, results similar to intermediate K coverage were reproduced in La doped Sr 2 IrO 4 18 . In these cases, a large Fermi Surface (FS) containing ∼ 1±x electrons was apparently observed (x is the number of added carriers), although the spectral weight along it could be strongly modulated. In contrast, La doping in Sr 3 Ir 2 O 7 apparently produces a small FS containing only the added x electrons 19 with a progressive reduct...

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Nonlinear Optics on Ferroic Materials

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Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet

Cited by 307 publications

References 43 publications

Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Transfer of spectral weight across the gap ofSr2IrO4induced by La doping

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Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet

Cited by 307 publications

References 43 publications

Crystal growth and intrinsic magnetic behaviour of Sr2IrO4

Crystal growth and intrinsic magnetic behaviour of Sr2IrO4

Transfer of spectral weight across the gap ofSr2IrO4induced by La doping

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Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄

Crystal growth and intrinsic magnetic behaviour of Sr₂IrO₄