Unconventional 17O and 63Cu NMR shift components in cuprate superconductors

Pavićević, Danica; Avramovska, Marija; Haase, Jürgen

doi:10.1142/s0217984920400473

Cited by 6 publications

(12 citation statements)

References 37 publications

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“…Figure 2B and the discussion in [7]. As pointed out previously [6,18], a spatial distribution of the planar O hole content, n O , that is often observed as NMR quadrupolar linewidth may cause a spatial variation of the pseudogap. In such a case, the temperature dependence of the shift can change significantly as smaller gaps dominate at lower temperatures.…”

Section: Discussion Of Cu and O Shiftsmentioning

confidence: 52%

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

et al. 2022

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Recently, an analysis of all available planar oxygen shift and relaxation data for the cuprate high-temperature superconductors showed that the data can be understood with a simple spin susceptibility from a metallic density of states common to all cuprates. It carries a doping dependent but temperature independent pseudogap at the Fermi surface, which causes the deviations from normal metallic behavior, also in the specific heat. Here, a more coherent, unbiased assessment of all data, including planar Cu, is presented and consequences are discussed, since the planar Cu data were collected and analyzed prior to the O data. The main finding is that the planar Cu shifts for one direction of the external magnetic field largely follow from the same states and pseudogap. This explains the shift suppression stated more recently, which leads to the failure of the Korringa relation in contrast to an enhancement of the relaxation due to antiferromagnetic spin fluctuations originally proposed. However, there is still the need for a second spin component that appears to be associated with the Cu 3d(x2−y2) hole to explain the complex Cu shift anisotropy and family dependence. Furthermore, it is argued that the planar Cu relaxation which was reported recently to be rather ubiquitous for the cuprates, must be related to this universal density of states and the second spin component, while not being affected by the simple pseudogap. Thus, while this universal metallic density of states with a pseudogap is also found in the planar Cu data, there is still need for a more elaborate scenario that eludes planar O.

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Section: Discussion Of Cu and O Shiftsmentioning

confidence: 52%

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

et al. 2022

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“…Over the years, a large base of NMR data became available, which makes a review of the early interpretation possible. Recently, it was shown that all planar 17 O NMR shift and relaxation data available in the literature point to a temperature independent but doping dependent pseudogap, very similar to what was proposed from the electronic entropy. Here we analyze the anisotropy of the shift and relaxation of planar O to establish whether a single electronic spin component is applicable, since the planar Cu shift anisotropy clearly fails such a description.…”

mentioning

confidence: 56%

“…where 17 K Lα is the orbital shift, and 17 K α (T ) denotes the spin shift. For a single spin component susceptibility, χ(T ), we have for the spin shift,…”

Section: Shiftsmentioning

confidence: 99%

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Temperature independent pseudogap from $^{17}$O and $^{89}$Y NMR and the single component picture

Avramovska¹,

Nachtigal²,

Haase³

2021

Preprint

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“…2B and the discussion in [7]. As pointed out previously [6,18], a spatial distribution of the planar O hole content, n O , that is often observed as NMR quadrupolar linewidth may cause a spatial variation of the pseudogap. In such a case the temperature dependence of the shift can change significantly as smaller gaps dominate at lower temperature.…”

Section: Discussion Of Cu and O Shiftsmentioning

confidence: 86%

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

Avramovska¹,

Nachtigal²,

Tsankov³

et al. 2022

Preprint

View full text Add to dashboard Cite

Recently, an analysis of all available planar oxygen shift and relaxation data for the cuprate high-temperature superconductors showed that the data can be understood with a simple spin susceptibility from a metallic density of states common to all cuprates. It carries a doping dependent but temperature independent pseudogap at the Fermi surface, which causes the deviations from normal metallic behavior, also in the specific heat. Here, a more coherent, unbiased assessment of all data, including planar Cu, is presented and consequences are discussed, since the planar Cu data were collected and analyzed prior to the O data. The main finding is that the planar Cu shifts for one direction of the external magnetic field largely follow from the same states and pseudogap. This explains the shift suppression stated more recently, which leads to the failure of the Korringa relation in contrast to an enhancement of the relaxation due to antiferromagnetic spin fluctuations originally proposed. However, there is still the need for a second spin component that appears to be associated with the Cu 3d(x 2 − y 2 ) hole to explain the complex Cu shift anisotropy and family dependence. Furthermore, it is argued that the planar Cu relaxation which was reported recently to be rather ubiquitous for the cuprates, must be related to this universal density of states and the second spin component, while not being affected by the simple pseudogap. Thus, while this universal metallic density of states with a pseudogap is also found in the planar Cu data, there is still need for a more elaborate scenario that eludes planar O.

show abstract

Unconventional 17O and 63Cu NMR shift components in cuprate superconductors

Cited by 6 publications

References 37 publications

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

Temperature independent pseudogap from $^{17}$O and $^{89}$Y NMR and the single component picture

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

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