Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR

Reichardt, Steven; Jurkutat, Michael; Guehne, Robin; Kohlrautz, Jonas; Erb, A.; Haase, Jürgen

doi:10.3390/condmat3030023

Cited by 20 publications

(25 citation statements)

References 56 publications

(122 reference statements)

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“…Figure 7. Uppermost satellites of planar 17 O with c B 0 as observed in various cuprates [12]. A significant O charge variation is evidenced for most materials by broadening well beyond magnetic linewidths, which is indicated by ; the upper abscissa indicates the necessary charge variation in terms of δn p of O hole content about average value n p .…”

Section: Planar Charge Density Variationsmentioning

confidence: 88%

“…The only exceptions are a few very specific configurations of YBCO, but these show double peak patterns for planar O and a narrow Cu resonance, rather than broad distributions. For one such configuration, YBa 2 Cu 3 O 6.9 , especially designed high pressure NMR experiments have recently identified the origin of this double peak pattern to be commensurate charge density variations on planar O that can order at elevated pressure [12]. Consequences of these findings will be discussed, as well.…”

Section: Introductionmentioning

confidence: 88%

“…A significant O charge variation is evidenced for most materials by broadening well beyond magnetic linewidths, which is indicated by ; the upper abscissa indicates the necessary charge variation in terms of δn p of O hole content about average value n p . Certain YBCO materials show narrow, double peak satellites, which were usually explained with the unit cell's orthorhombicity, but for YBa 2 Cu 3 O 6.95 they were now shown to be due to commensurate charge density variations on O [12]. In addition, even some materials with tetragonal unit cells (e.g., the Hg and Pr based materials) can show double peak features where a structural explanation cannot be given.…”

Section: Planar Charge Density Variationsmentioning

confidence: 99%

“…Only very recently, the structural interpretation was disproved using high pressure NMR on optimally doped YBa 2 Cu 3 O 6+y [12], cf. Figure 6.…”

Section: Planar Charge Density Variationsmentioning

confidence: 99%

“…Figure 6. Reichardt et al [12] investigated the charge symmetry at planar O and Cu at moderate pressures and temperatures that do not affect the chemical structure at all. Nevertheless, they observed significant changes of the local charge symmetry proving its electronic origin.…”

Section: Planar Charge Density Variationsmentioning

confidence: 99%

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Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR

2019

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Nuclear magnetic resonance (NMR) in cuprate research is a prominent bulk local probe of magnetic properties. NMR also, as was shown over the last years, actually provides a quantitative measure of local charges in the CuO 2 plane. This has led to fundamental insights, e.g., that the maximum T c is determined by the sharing of the parent planar hole between Cu and O. Using bonding orbital hole contents on planar Cu and O measured by NMR, instead of the total doping x, the thus defined two-dimensional cuprate phase diagram reveals significant differences between the various cuprate materials. Even more importantly, the reflected differences in material chemistry appear to set a number of electronic properties as we discuss here, for undoped, underdoped and optimally doped cuprates. These relations should advise attempts at a theoretical understanding of cuprate physics as well as inspire material chemists towards new high- T c materials. Probing planar charges, NMR is also sensitive to charge variations or ordering phenomena in the CuO 2 plane. Thereby, local charge order on planar O in optimally doped YBCO could recently be proven. Charge density variations seen by NMR in both planar bonding orbitals with amplitudes between 1% to 5% appear to be omnipresent in the doped CuO 2 plane, i.e., not limited to underdoped cuprates and low temperatures.

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Section: Planar Charge Density Variationsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 88%

Section: Planar Charge Density Variationsmentioning

confidence: 99%

“…Only very recently, the structural interpretation was disproved using high pressure NMR on optimally doped YBa 2 Cu 3 O 6+y [12], cf. Figure 6.…”

Section: Planar Charge Density Variationsmentioning

confidence: 99%

Section: Planar Charge Density Variationsmentioning

confidence: 99%

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Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR

2019

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Characterisation of contact twinning for cerussite, $$\hbox {PbCO}_3$$, by single-crystal NMR spectroscopy

et al. 2021

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Cerussite, $$\hbox {PbCO}_3$$ PbCO 3 , like all members of the aragonite group, shows a tendency to form twins, due to high pseudo-symmetry within the crystal structure. We here demonstrate that the twin law of a cerussite contact twin may be established using only $$^{207}$$ 207 Pb-NMR spectroscopy. This is achieved by a global fit of several sets of orientation-dependent spectra acquired from the twin specimen, allowing to determine the relative orientation of the twin domains. Also, the full $$^{207}$$ 207 Pb chemical shift tensor in cerussite at room temperature is determined from these data, with the eigenvalues being $$\delta _{11} = (-2315\pm 1)$$ δ 11 = ( - 2315 ± 1 ) ppm, $$\delta _{22} = (-2492 \pm 3)$$ δ 22 = ( - 2492 ± 3 ) ppm, and $$\delta _{33} = (-3071 \pm 3)$$ δ 33 = ( - 3071 ± 3 ) ppm.

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Properties of the Electronic Fluid of Superconducting Cuprates from 63Cu NMR Shift and Relaxation

Avramovska

Pavićević

Haase

2019

J Supercond Nov Magn

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Nuclear magnetic resonance (NMR) provides local, bulk information about the electronic properties of materials, and it has been influential for theory of high-temperature superconducting cuprates. Importantly, NMR found early that nuclear relaxation is much faster than what one expects from coupling to fermionic excitations above the critical temperature for superconductivity (Tc), i.e. what one estimates from the Knight shift with the Korringa law. As a consequence, special electronic spin fluctuations have been invoked. Here, based on literature relaxation data it is shown that the electronic excitations, to which the nuclei couple with a material and doping dependent anisotropy, are rather ubiquitous and Fermi liquid-like. A suppressed NMR spin shift rather than an enhanced relaxation leads to the failure of the Korringa law for most materials. Shift and relaxation below Tc support the view of suppressed shifts, as well. A simple model of two coupled electronic spin components, one with 3d(x 2 −y 2 ) orbital symmetry and the other with an isotropic s-like interaction can explain the data. The coupling between the two components is found to be negative, and it must be related to the pseudogap behavior of the cuprates. We can also explain the negative shift conundrum and the long-standing orbital shift discrepancy for NMR in the cuprates.

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Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR

Cited by 20 publications

References 56 publications

Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR

Tc and Other Cuprate Properties in Relation to Planar Charges as Measured by NMR

Characterisation of contact twinning for cerussite, $$\hbox {PbCO}_3$$, by single-crystal NMR spectroscopy

Properties of the Electronic Fluid of Superconducting Cuprates from 63Cu NMR Shift and Relaxation

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