Hard–X-ray diffraction study of charge stripe order in La
 1.48
 Nd
 0.4
 Sr
 0.12
 CuO
 4

Zimmermann, M. v.; Vigliante, A.; Niemöller, T.; Ichikawa, Noriya; Frello, T.; Madsen, J.; Wochner, P.; Uchida, S.; Andersen, N.H.; Tranquada, J. M.; Gibbs, Doon; Schneider, J. R.

doi:10.1209/epl/i1998-00204-2

Cited by 192 publications

(155 citation statements)

References 24 publications

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“…2. In agreement with hard X-ray studies 23,24 , the scattering was sharp along H but rod-like along L (correlation lengths ξ a ≈ 127a, ξ c ≈ 2c), indicating quasi-long-range order in the CuO 2 plane but weak coupling between planes. A maximum intensity of 175 Hz on a fluorescence background of 425 Hz was observed at (0.251, 0, 3/2).…”

supporting

confidence: 87%

Spatially modulated 'Mottness' in La2-xBaxCuO4

et al. 2005

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. However, as a neutron is neutral, it does not detect charge but rather its associated lattice distortion 7 , so it is not known whether the stripes involve ordering of the doped holes. Here we present a study of the charge order in LBCO with resonant soft X-ray scattering (RSXS). We observe giant resonances near the Fermi level as well as near the correlated gap 8,9 , demonstrating significant modulation in both the doped-hole density and the 'Mottness', or the degree to which the system resembles a Mott insulator 10 . The peak-to-trough amplitude of the valence modulation is estimated to be 0.063 holes, which suggests 11 an integrated area of 0.59 holes under a single stripe, close to the expected 0.5 for half-filled stripes.The charge/spin superstructure in LNSCO 5 and LBCO 6 appears only in the low-temperature tetragonal (LTT) phase, is most stable at x = 1/8 and coincides with an anomalous suppression of the critical temperature T c (ref. 12). This phase is frequently interpreted as (quasi) static stripes that have been pinned by the LTT distortion. The charge reflections observed with neutron scattering are weak (∼6 times less intense than the magnetic reflections) as neutrons only detect the lattice distortion, which was estimated to be only about 0.004Å (ref. 7). However, one assumes that the hole modulation itself is significant. We point out, however, that the spin-density wave in elemental Cr also exhibits half-wavelength charge reflections that are weaker by about a factor of 4.1 and represent a distortion of similar size 13 . So, in the neutron Bragg peaks alone there is no clear difference between the phenomenon in LNSCO and a simple spin-density wave. To determine whether the doped holes are actually involved we have studied LBCO with RSXS near the O K (1s → 2p) and Cu L 3/2 (2p 3/2 → 3d x2−y2 ) edges, which provide direct sensitivity to valence electron ordering [14][15][16][17][18][19][20] .Single crystals of La 2−x Ba x CuO 4 with x = 1/8 were grown by the floating-zone method 21 . The sample used in this study had T c = 2.5 K indicating suppressed superconductivity and stabilized spin/charge order. The sample was cleaved in air revealing a surface with (0,0,1) orientation. RSXS measurements were performed on beam line X1B at the National Synchrotron Light Source, Brookhaven, using a 10-axis, ultrahigh-vacuumcompatible diffractometer. The sample was cooled with a He flow cryostat connected through Cu braids, providing a base temperature of 18 K. X-ray absorption spectra (XAS) were measured in situ in fluorescence yield mode at the O K and Cu L 3/2 edges and found to be consistent with previous studies 8 (see Figs 1, 3a). We will denote reciprocal space with Miller indices (H,K,L), which represent a momentum transfer Q = (2π/a H,2π/b K,2π/c L) where a = b = 3.788Å, c = 13.23Å. The incident X-ray polarization depends on Q but was approximately 60 • from the Cu-O bond for measurements at both edges.The O K XAS in the cuprates exhibits a mobile carrier peak (MCP) at 528.6 eV, corresponding to tran...

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confidence: 87%

Spatially modulated 'Mottness' in La2-xBaxCuO4

et al. 2005

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“…We have characterized the charge stripe order with highenergy single-crystal x-ray diffraction (XRD), by probing the associated lattice modulation. 13,14,17 That a modulation of the electron density truly exists, has previously been demonstrated in Ref. 19 for La 1.875 Ba 0.125 CuO 4 by means of resonant soft x-ray scattering.…”

Section: Introductionmentioning

confidence: 75%

“…While earlier studies have focussed mainly on reflections at low ℓ such as (2±2δ,0,0.5), 13,14,64 it was realized in more recent works that strong CO reflections can also be found at higher ℓ such as ℓ = 5.5 and 8.5. 20,65,66 A conclusive analysis presented by Kim et al in Ref.…”

Section: B Charge Stripe Ordermentioning

confidence: 99%

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
309
43
411
2
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The correlations between stripe order, superconductivity, and crystal structure in La2−x Bax CuO4 single crystals have been studied by means of x-ray and neutron diffraction as well as static magnetization measurements. The derived phase diagram shows that charge stripe order (CO) coexists with bulk superconductivity in a broad range of doping around x = 1/8, although the CO order parameter falls off quickly for x = 1/8. Except for x = 0.155, the onset of CO always coincides with the transition between the orthorhombic and the tetragonal low temperature structures. The CO transition evolves from a sharp drop at low x to a more gradual transition at higher x, eventually falling below the structural phase boundary for optimum doping. With respect to the interlayer CO correlations, we find no qualitative change of the stripe stacking order as a function of doping, and in-plane and out-of-plane correlations disappear simultaneously at the transition. Similarly to the CO, the spin stripe order (SO) is also most pronounced at x = 1/8. Truly static SO sets in below the CO and coincides with the first appearance of in-plane superconducting correlations at temperatures significantly above the bulk transition to superconductivity (SC). Indications that bulk SC causes a reduction of the spin or charge stripe order could not be identified. We argue that CO is the dominant order that is compatible with SC pairing but competes with SC phase coherence. Comparing our results with data from the literature, we find good agreement if all results are plotted as a function of x ′ instead of the nominal x, where x ′ represents an estimate of the actual Ba content, extracted from the doping dependence of the structural transition between the orthorhombic phase and the tetragonal high-temperature phase.

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“…(3) The intensity of the charge-order scattering is strongly modulated along Q z , with maxima at l = n ± 1 2 , where n is an integer. This behavior is straightforwardly explained in terms of unidirectional stripe order tied to local lattice symmetry, with Coulomb repulsion between stripes in equivalent (next-nearest-neighbor) layers [179]. For a checkerboard pattern, one would expect correlations between nearest-neighbor layers, which would give a Q z dependence inconsistent with experiment.…”

Section: Stripes In Cupratesmentioning

confidence: 99%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

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Hard–X-ray diffraction study of charge stripe order in La _1.48 Nd _0.4 Sr _0.12 CuO ₄

Cited by 192 publications

References 24 publications

Spatially modulated 'Mottness' in La2-xBaxCuO4

Spatially modulated 'Mottness' in La2-xBaxCuO4

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
309
43
411
2
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Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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Hard–X-ray diffraction study of charge stripe order in La 1.48 Nd 0.4 Sr 0.12 CuO 4

Cited by 192 publications

References 24 publications

Spatially modulated 'Mottness' in La2-xBaxCuO4

Spatially modulated 'Mottness' in La2-xBaxCuO4

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B309434112View full textAdd to dashboardCite

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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Hard–X-ray diffraction study of charge stripe order in La _1.48 Nd _0.4 Sr _0.12 CuO ₄

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
309
43
411
2
View full text Add to dashboard Cite