Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Drachuck, Gil; Razzoli, Elia; Bazalitski, G.; Kanigel, Amit; Niedermayer, Ch.; Shi, M.; Keren, Amit

doi:10.1038/ncomms4390

Cited by 30 publications

(41 citation statements)

References 22 publications

(24 reference statements)

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“…Recent reports of the DSDW state at the low-doping limit of La 2− x Sr x CuO 4 found a similar asymmetry in the incommensurate scattering 33 . The likely origin for the asymmetry in the incommensurability of doped (Sr 1− x La x ) 2 IrO 4 is from a subtle orthorhombicity in the lattice below our current experimental resolution.…”

Section: Discussionmentioning

confidence: 54%

“…32 , and the propagation vector is split transverse to the commensurate AF wave vector—denoting a spin density wave modulation along the bond diagonal. Furthermore, at the low doping limit, coexistence of long-range DSDW correlations and AF order is observed in La 2− x Sr x CuO 4 ( x = 0.0192) 33 and ( x = 0.01) 34 . These features parallel those observed for the competing incommensurate state in (Sr 1− x La x ) 2 IrO 4 and are suggestive of a common instability in the phase diagrams of both systems.…”

Section: Discussionmentioning

confidence: 92%

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Unidirectional spin density wave state in metallic (Sr1−xLa x )2IrO4

et al. 2018

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Materials that exhibit both strong spin–orbit coupling and electron correlation effects are predicted to host numerous new electronic states. One prominent example is the Jeff = 1/2 Mott state in Sr2IrO4, where introducing carriers is predicted to manifest high temperature superconductivity analogous to the S = 1/2 Mott state of La2CuO4. While bulk superconductivity currently remains elusive, anomalous quasiparticle behaviors paralleling those in the cuprates such as pseudogap formation and the formation of a d-wave gap are observed upon electron-doping Sr2IrO4. Here we establish a magnetic parallel between electron-doped Sr2IrO4 and hole-doped La2CuO4 by unveiling a spin density wave state in electron-doped Sr2IrO4. Our magnetic resonant X-ray scattering data reveal the presence of an incommensurate magnetic state reminiscent of the diagonal spin density wave state observed in the monolayer cuprate (La1−xSrx)2CuO4. This link supports the conjecture that the quenched Mott phases in electron-doped Sr2IrO4 and hole-doped La2CuO4 support common competing electronic phases.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 92%

Unidirectional spin density wave state in metallic (Sr1−xLa x )2IrO4

et al. 2018

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“…Intriguingly, a RXS study conducted in the pseudogap phase [109] has uncovered an incommensurate magnetic scattering reminiscent of unidirectional spin density waves observed in the hole-doped cuprate La 2−x Sr x CuO 4 [122,123], supporting the idea that the pseudogap is associated with a symmetry-breaking order. In a similar vein, a d-wave spin-orbit density wave order with a circulating staggered pseudospin current was proposed to underlie the pseudogap [124].…”

Section: Electron Dopingmentioning

confidence: 94%

Square Lattice Iridates

Bertinshaw

Kim

Khaliullin

et al. 2019

Annu. Rev. Condens. Matter Phys.

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Over the last few years, Sr 2 IrO 4 , a single-layer member of the Ruddlesden-Popper series iridates, has received much attention as a close analog of cuprate high-temperature superconductors.Although there is not yet firm evidence for superconductivity, a remarkable range of cuprate phenomenology has been reproduced in electron-and hole-doped iridates including pseudogaps, Fermi arcs, and d-wave gaps. Further, a number of symmetry breaking orders reminiscent of those decorating the cuprate phase diagram have been reported using various experimental probes. We discuss how the electronic structures of Sr 2 IrO 4 through strong spin-orbit coupling leads to the low-energy physics that had long been unique to cuprates, what the similarities and differences between cuprates and iridates are, and how these advance the field of high-temperature superconductivity by isolating essential ingredients of superconductivity from a rich array of phenomena that surround it. Finally, we comment on the prospect of finding a new high-temperature superconductor based on the iridate series. b c a Sr O Ir a b c pseudospin-1/2 J a b FIG. 1. Crystal and magnetic structures of Sr 2 IrO 4 . (a) The crystal structure is based on Ref. [26] according to which the space group is I4 1 /acd. However, recent studies indicate that the symmetry is lower and most probably is I4 1 /a [27-29]. (b) Quasi-2D network of Ir and O. (c) The magnetic structure from Ref. [2]. II. MAPPING ONTO CUPRATE PHYSICSSoon after the discovery of HTSC in the cuprates, many complex oxides with a K 2 NiF 4 structure (isostructural to La 2 CuO 4 ) and its variants were searched for signs of superconductivity. Among these were Sr 2 RhO 4 and Sr 2 IrO 4 [30], which are "one-hole" systems, albeit with a t 2g -hole in the low-spin d 5 configuration as opposed to an e g -hole in cuprates. However, it was quickly apparent that 4d and 5d systems tend to be rather weakly correlated. In fact, Sr 2 RhO 4 is a Fermi liquid metal [31, 32] with a Fermi surface understood qualitatively in terms of a band structure calculated using density functional theory within the local density approximation (LDA) [33, 34]. Interestingly, the Fermi surfaces of Sr 2 RhO 4 and Sr 2 IrO 4 , calculated without SOC, are near indistinguishable due to their almost identical crystal structures with less than 1% difference in their lattice parameters [30]. A closer inspection, however, reveals that LDA does not accurately replicate the measured FermiX M X E-μ (eV) E-μ (eV) E-μ (eV) M X Γ Γ Γ Γ Γ Γ U ζ ζ μ wide band metal narrow J eff =1/2 band J eff =1/2 Mott state LDA+SOC LDA LDA+SOC+U t 2g band J eff =1/2 band J eff =3/2 band J eff =3/2 band J eff =1/2 UHB J eff =1/2 LHB FIG. 2. Illustration of the SOC driven Mott transition. Introduction of SOC splits off a narrow band near the Fermi level (orange solid lines), for which a moderate Coulomb interaction U ∼2 eV is sufficient to open a gap.observation of a significant gap reduction across T N , a typical Slater behavior, supports this viewpoint [42,43]. On th...

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“…The studying of the interplay between magnetism and superconductivity in cuprates has a long history [1,2,3]. Over the last fifteen years, a wealth of experimental results has suggested the presence of the charge ordering [4,5,6,7,8,9,10,11,12,13,14] and the interplaying spin and charge orderings [15,16,17,18,19,20,21] in cuprates. Recently [22] we argued that an unique property of high-T c cuprates is related to the charge-transfer instability in the CuO 2 planes.…”

Section: Introductionmentioning

confidence: 99%

Phase diagrams of a 2D Ising spin-pseudospin model

Panov

Ulitko

Budrin

et al. 2019

Journal of Magnetism and Magnetic Materials

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We consider the competition of magnetic and charge ordering in high-Tc cuprates within the framework of the simplified static 2D spin-pseudospin model. This model is equivalent to the 2D dilute antiferromagnetic (AFM) Ising model with charged impurities. We present the mean-field results for the system under study and make a brief comparison with classical Monte Carlo (MC) calculations. Numerical simulations show that the cases of strong exchange and strong charge correlation differ qualitatively. For a strong exchange, the AFM phase is unstable with respect to the phase separation (PS) into the charge and spin subsystems, which behave like immiscible quantum liquids. An analytical expression was obtained for the PS temperature.The Hamiltonian of the static spin-pseudospin model is:where S zi is a z-projection of the on-site pseudospin S = 1 and σ zi = P 0i s zi /s is a normalized z-projection of conventional spin s = 1/2 operator, multiplied by the projection operator P 0i = 1 − S 2 iz . The ∆ = U/2 is the on-site correlation and V > 0 is the inter-site density-density interaction, J =J/s 2 > 0 is the Cu 2+ −Cu 2+ Ising spin exchange coupling, h =h/s is the external magnetic field, µ is the chemical potential, so we assume the total charge constraint, nN = S zi = const, where n is the density of doped charge. The sums run over the sites of a 2D square lattice, ij means the nearest neighbors. This spin-pseudospin model generalizes the 2D dilute AFM Ising model with charged impurities. In the limit ∆ → −∞ it reduces to the S = 1 2 Ising model with fixed magnetization. At ∆ > 0 the results can be compared with the Blume-Capel model [27,28,29] or with the Blume-Emery-Griffiths model [30].An analysis of the ground state (GS) phase diagrams was done within the mean field approach [24,25]. It was shown, that the five GS phases are realized in two limits. In a weak exchange limit, atJ < V , all the GS phases (COI, COII, COIII, FIM) correspond to the charge ordering (CO) of a checker-board type at mean charge density n. While the COI phase is the charge-ordered one without spin centers, the COII and COIII phases are diluted by the non-interacting spins distributed in one sublattice only. This ferrimagnetic spin ordering is a result of the mean-field approach, so the classical MC calculations show a paramagnetic response at low temperatures. The FIM phase is also formally ferrimagnetic. Here the AFM spin ordering is diluted by the non-interacting charges distributed in one sublattice. In a strong exchange limit, atJ > V , there are only COI phase and AFM phase with the charges distributed in both sublattices. The absence of charge transfer in the Hamiltonian (1) is the most important limitation of our present model for comparison with the actual phase diagram of cuprates. But, as shown in [31], the accounting for two-particle transport enriches the GS phase diagram of the spin-pseudospin model with superfluid and supersolid phases competing with CO phases.The paper is organized as follows. We present the mean-field result...

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Comprehensive study of the spin-charge interplay in antiferromagnetic La2−xSrxCuO4

Cited by 30 publications

References 22 publications

Unidirectional spin density wave state in metallic (Sr1−xLa x )2IrO4

Unidirectional spin density wave state in metallic (Sr1−xLa x )2IrO4

Square Lattice Iridates

Phase diagrams of a 2D Ising spin-pseudospin model

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