Field-dependent specific heat of the canonical underdoped cuprate superconductor $$\hbox {YBa}_2\hbox {Cu}_4\hbox {O}_8$$

Tallon, J. L.; Loram, J. W.

doi:10.1038/s41598-020-79017-3

Cited by 8 publications

(8 citation statements)

References 44 publications

(74 reference statements)

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“…Thus, the straight lines observed in Fig. 3 are expected and we deduce the following slopes: C exp ⊥a /C exp ⊥c ≈ 0.90(15), C exp σ /C exp ⊥a ≈ 1.45 (10). These numbers are in very good agreement with what we find for La 2−x Sr x CuO 4 and even the other cuprates.…”

Section: Shiftssupporting

confidence: 90%

“…The density of states outside the gap is ubiquitous for the cuprates, this includes the density of states when the gap is fully closed. Since this behavior is similar to measurements of the electronic entropy [8,10] in a few materials, the same doping dependent entropy should govern all cuprates.…”

Section: Pseudogap and 89 Y Nmr Of Yba2cu3o 7−δsupporting

confidence: 74%

“…Very recently, a different definition of the NMR pseudogap was proposed [9], which is the same as the one based on the specific heat data of Loram et al [8,10]. Based on all available planar O data in the literature (more than 35 independent sets of relaxation, and more [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Avramovska¹,

Nachtigal²,

Haase³

2021

Preprint

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Section: Shiftssupporting

confidence: 90%

Section: Pseudogap and 89 Y Nmr Of Yba2cu3o 7−δsupporting

confidence: 74%

See 1 more Smart Citation

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

Avramovska¹,

Nachtigal²,

Haase³

2021

Preprint

View full text Add to dashboard Cite

“…The density of states outside the gap or in its absence is universal to the cuprates, independent of doping and family [6]. This scenario is similar to what was concluded from specific heat data [8,9]. Thus, lowering the doping opens the gap, and the lost, low-energy states cease to contribute to shift, relaxation, or specific heat.…”

Section: Introductionsupporting

confidence: 81%

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: Introductionsupporting

confidence: 81%

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

Field-dependent specific heat of the canonical underdoped cuprate superconductor $$\hbox {YBa}_2\hbox {Cu}_4\hbox {O}_8$$

Abstract: The cuprate superconductor $$\hbox {YBa}_2\hbox {Cu}_4\hbox {O}_8$$ YBa 2 Cu 4 O 8 , in comparison with most other cuprates, has a stable stoichiometry, is largely free of defects and may be regarded as … Show more

Cited by 8 publications

References 44 publications

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

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

Planar Cu and O NMR and the Pseudogap of Cuprate Superconductors

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