Cu and Ba nuclear quadrupole resonance study of Y2Ba4Cu7O15 at high pressure

Bankay, M.; Stern, Raivo; Roos, J.; Mali, M.; Brinkmann, D.

doi:10.1016/0921-4534(94)92048-6

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Alloul's group (Alloul Many other underdoped compounds exhibit the pseudogap in their magnetic resonance properties. Some examples are the naturally underdoped and stoichiometric YBa 2 Cu 4 O 8 (Bankay et al 1994) and the related Y 2 Ba 4 Cu 7 O 15 (Stern et al 1994), the two-layer bismuth compound (Walstedt et al 1991) and the mercury compounds (Julien et al 1996, Bobroff et al 1997. The pseudogap is observed in the Knight shift and relaxation rates of the planar copper and oxygen nuclei as well as in the nuclei situated between the CuO 2 planes in multilayer compounds.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

“…This is in contrast to others in which a smooth evolution with temperature is observed. The latter is typified by underdoped YBCO, illustrated in figure 20, whereas crossover temperatures can be discerned, for example, in YBCO 124 (Bankay et al 1994) displayed in figure 21. At the upper crossover temperature T • the Knight shift changes behaviour from being temperature independent to decreasing linearly with temperature below T • .…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

See 1 more Smart Citation

The pseudogap in high-temperature superconductors: an experimental survey

1999

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We present an experimental review of the nature of the pseudogap in the cuprate superconductors. Evidence from various experimental techniques points to a common phenomenology. The pseudogap is seen in all high temperature superconductors and there is general agreement on the temperature and doping range where it exists. It is also becoming clear that the superconducting gap emerges from the normal state pseudogap. The d-wave nature of the order parameter holds for both the superconducting gap and the pseudogap. Although an extensive body of evidence is reviewed, a consensus on the origin of the pseudogap is as lacking as it is for the mechanism underlying high temperature superconductivity.

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Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

The pseudogap in high-temperature superconductors: an experimental survey

1999

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“…So it was concluded that the Cu relaxation is enhanced from antiferromagnetic spin fluctuations that are shielded from planar O due to symmetry. Also, the shifts for planar Cu for c⊥B 0 are quite similar to those of planar O (that is involved in the spin transfer B), and this was seen as evidence for single component behavior of the cuprates, based on the data for two systems, YBa 2 Cu 3 O 6.63 and YBa 2 Cu 4 O 8 [14,15].…”

Section: The Early Nmr Viewmentioning

confidence: 91%

A Different NMR View of Cuprate Superconductors

Haase

2022

J Supercond Nov Magn

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Nuclear magnetic resonance (NMR) is a powerful quantum probe, but the early conclusions on the physics of the cuprates, based on a limited set of data, have to be revised in view of recent findings and results from extensive literature analyses of most NMR data. These show two coupled electronic spin components that influence the nuclei, most easily seen with the planar Cu shift anisotropy. One component is spin from the recently identified ubiquitous metallic excitations, the other likely due to the intrinsic, antiferromagnetically coupled electronic Cu spin. Both components and its intricate interaction leave their imprint on nuclear shifts and relaxation. They also show a family dependence seen in the charge sharing between planar Cu and O. The main phenomena of the doping and temperature dependences of the interplay between both spins components are discussed in terms of an apparent phenomenology that awaits explanation from theory.

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“…Historically, on the basis of the T -dependence of the NMR shifts for YBa 2 Cu 3 O 6+δ and YBa 2 Cu 4 O 8 (both materials contain Cu chains that influence the spin response) it was concluded that the cuprates contain a single electronic fluid, since the planar Cu and planar O shift data could be understood in terms of a single electronic spin susceptibility [8,9]. These findings were the basis for the phenomenological MMP theory [10] that could explain many other NMR details, as well.…”

Section: Introductionmentioning

confidence: 99%

Two-Component Behavior of Cuprate Superconductors from NMR Shifts

Rybicki

Greven²,

Haase

et al. 2011

MSF

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NMR spin shift data of La1:85Sr0:15CuO4, HgBa2CuO4+ at ambient pressure, andof YBa2Cu4O8 at pressure up to 63 kbar are discussed that fail the traditional single-electronicuid picture used for the discussion of NMR data. Instead the results point to a commonexplanation for all three systems in terms of two electronic components. One of them hasa temperature-dependent magnetic susceptibility while the second component, as well as itscoupling to the rst component, are constant above the superconducting transition temperatureTc. All susceptibilities vanish below Tc.

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Cu and Ba nuclear quadrupole resonance study of Y2Ba4Cu7O15 at high pressure

Cited by 4 publications

References 3 publications

The pseudogap in high-temperature superconductors: an experimental survey

The pseudogap in high-temperature superconductors: an experimental survey

A Different NMR View of Cuprate Superconductors

Two-Component Behavior of Cuprate Superconductors from NMR Shifts

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