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Tranquada, J. M.; Shirane, G.; Keimer, B.; Shamoto, S.; Sato, M.

doi:10.1103/physrevb.40.4503

Cited by 196 publications

(122 citation statements)

References 53 publications

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“…No in-plane gap has been resolved; however, the in-plane mode shows a dispersion of about 3 meV along Q z [107,113,114]. The latter dispersion is controlled by the effective exchange between Cu moments in neighboring bilayers through the nonmagnetic Cu(1) sites, which is on the order of 10 −4 J.…”

Section: Spin Wavesmentioning

confidence: 99%

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Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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Summary. Neutron scattering studies have provided important information about the momentum and energy dependence of magnetic excitations in cuprate superconductors. Of particular interest are the recent indications of a universal magnetic excitation spectrum in hole-doped cuprates. That starting point provides motivation for reviewing the antiferromagnetic state of the parent insulators, and the destruction of the ordered state by hole doping. The nature of spin correlations in stripeordered phases is discussed, followed by a description of the doping and temperature dependence of magnetic correlations in superconducting cuprates. After describing the impact on the magnetic correlations of perturbations such as an applied magnetic field or impurity substitution, a brief summary of work on electron-doped cuprates is given. The chapter concludes with a summary of experimental trends and a discussion of theoretical perspectives. IntroductionNeutron scattering has played a major role in characterizing the nature and strength of antiferromagnetic interactions and correlations in the cuprates. Following Anderson's observation [1] that La 2 CuO 4 , the parent compound of the first high-temperature superconductor, should be a correlated insulator, with moments of neighboring Cu 2+ ions anti-aligned due to the superexchange interaction, antiferromagnetic order was discovered in a neutron diffraction study of a polycrystalline sample [2]. When single-crystal samples became available, inelastic studies of the spin waves determined the strength of the superexchange, J, as well as weaker interactions, such as the coupling between CuO 2 layers. The existence of strong antiferromagnetic spin correlations above the Néel temperature, T N , has been demonstrated and explained. Over time, the quality of such characterizations has improved considerably with gradual evolution in the size and quality of samples and in experimental techniques.Of course, what we are really interested in understanding are the optimallydoped cuprate superconductors. It took much longer to get a clear picture of the magnetic excitations in these compounds, which should not be surprising

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Section: Spin Wavesmentioning

confidence: 99%

“…Its effect is to split the spin waves into acoustic and optic branches, having odd and even symmetry, respectively, with respect to the bilayers. The structure factors for these excitations are [107] …”

Section: Spin Wavesmentioning

confidence: 99%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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“…They explained those results in terms of an incoherent ordering of Cu (1 ) 2+ magnetic moments in the oxygen-deficient layers at low temperatures. These two neutron diffraction experiments [8,9] also reported that the Cu(l) moment in the oxygen-deficient layer brings about the ferromagnetic spin alignment of the Cu (2) layers adjacent to the Cu (1) layer along the c axis. This ferromagnetic spin alignment is caused by the frustration due to the competition of the antiferro-and ferromagnetic interaction between Cu(2) layers mediated primarily by the Cu( 1) layer.…”

Section: Introductionmentioning

confidence: 99%

“…The two neutron experiments [8,9] imply that the staggered Cu(l) or Cu(2) moment, which is produced in our sample in the low temperature region, is responsible for the fluctuating magnetic field contributing dominantly to T, at the Cu (1) site. The fluctuating local field at the Cu (1) site is generated by the dipolar or transferred hyperfine fields from these staggered moments.…”

Section: The Origin Of the Fluctuating Magnetic Field At Cu(l) Sitementioning

confidence: 99%

“…Tranquada et al [9] carried out a neutron diffraction experiment on a single crystal with x = 0.3 and found an extra diffuse intensity at temperatures below 30 K and a decrease of normal Bragg peak intensities. They explained those results in terms of an incoherent ordering of Cu (1 ) 2+ magnetic moments in the oxygen-deficient layers at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Content Dependence of ⁶³Cu(1) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa₂Cu₃O_6+xH_y

Niki

Kano

Takase

et al. 1998

Zeitschrift Für Naturforschung A

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The oxygen content dependence of 63 Cu NQR at the Cu(l) site and proton NMR have been measured in the antiferromagnetic phase of powdered samples of hydrogen-doped YBa 2 Cu 3 0 6+x .H v (0.07 < JC < 0.17 and y » 1) from 4.2 to 90 K. The spectrum of 1 H NMR is a single line and the line width increases below 15 Kdue to magnetic interactions. The enhancements of Tf 1 and 7^1 of 63 Cu(l)NQR occur around 35 and 15 K, respectively. These enhancements increase with increasing oxygen concentration. The maximum values of Tf 1 and T^ for the sample with x = 0.17 reach 200 sec -1 and more than 7 msec -1 , respectively. The predominant source for the relaxation mechanism of 63 Cu(l) NQR and the line broadening of 'H NMR are found to be the fluctuating magnetic field due to the staggered Cu 2+ moments.

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Disordered Ground‐State Properties of the Double‐Layer Antiferromagnetic Quantum XXZ Model

Wei

2001

phys. stat. sol. (b)

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The double-layer antiferromagnetic quantum XXZ model is studied by the bond-operator meanfield theory. The transverse and longitudinal modes in excited spectra, and the phase diagram for disorder-order phase transition about D and J/J ? , which are the relative strength of spin anisotropy and the ratio of the intralayer coupling to the interlayer coupling, respectively, are obtained. It is found that the critical ratio of (J/J ? ) c is 0.174 for XY model (D = 0), and is 0.430 for isotropic model (D = 1). In the disordered phase and on the critical points, the excitation spectra are analyzed. The spin gap from the condensed spin singlets to the first excited states, the ground state energy and the spin wave velocities in the disordered state are calculated as functions of parameters D and J/J ? .

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Neutron scattering study of magnetic excitations inYBa2Cu3

Cited by 196 publications

References 53 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Oxygen Content Dependence of ⁶³Cu(1) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa₂Cu₃O_6+xH_y

Disordered Ground‐State Properties of the Double‐Layer Antiferromagnetic Quantum XXZ Model

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Neutron scattering study of magnetic excitations inYBa2Cu3

Cited by 196 publications

References 53 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Oxygen Content Dependence of 63Cu(1) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa2Cu3O6+xHy

Disordered Ground‐State Properties of the Double‐Layer Antiferromagnetic Quantum XXZ Model

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Oxygen Content Dependence of ⁶³Cu(1) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa₂Cu₃O_6+xH_y