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Walstedt, R. E.; Warren, W. W.; Bell, R. F.; Brennert, G. F.; Espinosa, G. P.; Cava, R. J.; Schneemeyer, Lynn; Waszczak, J. V.

doi:10.1103/physrevb.38.9299

Cited by 105 publications

(27 citation statements)

References 20 publications

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“…(1) leads immediately to the result that P(q) can greatly enhance Ti -1 without much effect on Ks(T), i.e., P(0) is thought to be negligibly small. The 63Cu relaxation in YBCO is thus greatly enhanced relative to expectations based on the band density of states [6].…”

Section: [Z" (• O))/~ol~_o = Tmentioning

confidence: 62%

“…It may also be enhanced by the two-dimensional nature of these systems. In addition, it was evident early on [6] that strong observed enhancements of T11 for the ~anar Cu sites in these compounds reflects enhancement of Z"(~l, o)) for q # 0. AFM exchange provides a source for q-dependent enhancement, since it leads to magnetic fluctuation peaks in )~"(q,o)) near Qo -~ (n/a, n/a), which is the AFM ordering point in q-space.…”

Section: The Spin Gap Effectmentioning

confidence: 99%

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Spin gaps and spin dynamics in superconducting cuprates

Walstedt

Warren

1992

Appl. Magn. Reson.

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Spin gap effects, consisting of a declining uniform susceptibility and spin paramagnetic NMR shift at low temperatures in the normal state and associated Ti behavior, are discussed and documented in several cuprate superconductors. Dynamic spin magnetism in these systems is further reviewed in the light of mean-field models, where we note that detailed results from the model by Millis, Monien, and Pines are not borne out in recent neutron data on YBa2Cu306.92. T1 data on 170 in Lal.ssSr0.1sCuO4 are presented, showing consistency with neutron dynamic susceptibility data for T_-_ 80 K, but exhibiting a strong spin gap character below 80 K which is not present in the neutron data. Data for Zn-doped YBCO with Te = 60 K are also presented, showing strong RKKY broadening from localized moments in the planes, but no spin gap effect such as that found in the T c ~ 60 K oxygen-deficient phase.

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Section: [Z" (• O))/~ol~_o = Tmentioning

confidence: 62%

Section: The Spin Gap Effectmentioning

confidence: 99%

Spin gaps and spin dynamics in superconducting cuprates

Walstedt

Warren

1992

Appl. Magn. Reson.

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“…The oxygen NMR relaxation rate 1/ 17 T 1 T is temperature independent (as expected in a Fermi liquid) and has magnitude slightly larger than predicted by the Korringa relation 13 . The copper relaxation rate 1/ 63 T 1 T increases as the temperature is decreased 14 ; this has been argued to be due to antiferromagnetic correlations within a Fermi liquid state 15 . Also, photoemission experiments 16 have observed a large Fermi surface in optimally doped Y Ba 2 Cu 3 O 7 .…”

Section: Datamentioning

confidence: 99%

Theory of the spin gap in high-temperature superconductors

1996

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We analyze pairing in two dimensional spin liquids. We argue that interplane pairing enhanced by magnetic correlations is the most plausible explanation of the spin gap phenomenon observed in underdoped cuprates. The details of the pairing theory depend on the in-plane antiferromagnetic correlations. We consider two models: 2pF correlations induced by a strong gauge field interaction and undamped spin waves. We estimate the pairing temperature Ts and the angular dependence of the gap function and discuss physical consequences.

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“…_1 is not conventional as observed in normal superconductors, and the absolute value is much larger than that estimated from the static susceptibility [16], This suggests that the antiferromagnetic spin fluctuations enhance T{~1. [8,17].…”

Section: Nuclear Relaxationmentioning

confidence: 81%