Antiferromagnetic domains in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:m

Jànossy, A.; Simón, F.; Fehér, Titusz; Rockenbauer, Antal; Korecz, L.; Chen, C.; Chowdhury, A.J.S.; Hodby, J.W.

doi:10.1103/physrevb.59.1176

Cited by 43 publications

(36 citation statements)

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“…They found that in zero field, the spins must lie along [100] or [010] directions (parallel to the Cu-O bonds), and that the applied field rotates them towards [110]. This result has been confirmed by electron-spin resonance studies of YBa 2 Cu 3 O 6+x with a small amount of Gd sustituted for Y [84].…”

Section: Antiferromagnetic Ordersupporting

confidence: 62%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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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: Antiferromagnetic Ordersupporting

confidence: 62%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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Handbook of High-Temperature Superconductivity

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“…64 The buckled structure of the CuO 2 planes in ortho-I YBa 2 Cu 3 O 6.9 (see Fig. 1 67 The low energy excitations (E 30 meV) we observe have their predominant fluctuations within the CuO 2 planes making the a/b response largest. At higher energies, E ≈ 40 meV, the excitations are more isotopic.…”

Section: A Response In the Normal And Superconducting Statesmentioning

confidence: 99%

Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9
Headings
¹
,
Hayden
²
,
Kulda
³

et al. 2011
Phys. Rev. B
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We use inelastic neutron scattering with spin polarization analysis to study the magnetic excitations in the normal and superconducting states of YBa 2 Cu 3 O 6.9 . Polarization analysis allows us to determine the spin polarization of the magnetic excitations and to separate them from phonon scattering. In the normal state, we find unambiguous evidence of magnetic excitations over the 10-60 meV range of the experiment with little polarization dependence to the excitations. In the superconducting state, the magnetic response is enhanced near the "resonance energy" and above. At lower energies, 10 E 30 meV, the local susceptibility becomes anisotropic, with the excitations polarized along the c axis being suppressed. We find evidence for a new diffuse anisotropic response polarized perpendicular to the c axis which may carry significant spectral weight.

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“…The Gd 3+ shift due to the electronic exchange interaction between Gd 3+ and CuO 2 is linked to the susceptibility through the constant Gd A ≈ −15 mole/emu [16] (in analogy with the NMR hyperfine constant). We neglect the anisotropy of Gd A, since a comparison of the anisotropy of the shifts in the normal state YBa 2 Cu 3 O 7 [14] and antiferromagnetic YBa 2 Cu 3 O 6 [15] shows that the anisotropy of the product Gd Aχ α s is approximately 5%. B α dia is the bulk demagnetizing field of the supercurrents in the crystallites.…”

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Magnetic-Field-Induced Low-Energy Spin Excitations inYBa2Cu4O8Measured b

et al. 2000

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We have measured the spin susceptibility of the underdoped high temperature superconductor, YBa2Cu4O8 by Gd 3+ electron spin resonance in single crystals and aligned powders at several magnetic fields between 3 and 15.4 T. At low temperatures and high fields, the spin susceptibility of the CuO2 planes is enhanced slightly in the B c orientation with respect to the B ⊥ c orientation. The enhancement in an applied field of 15.4 T (≈ 0.15 Hc2) at 16 K (0.2 Tc) is approximately 10 percent of the susceptibility measured at Tc. Such a small magnitude suggests that the second critical field of superconductivity, Hc2 ≈ 100 T, would not suppress the pseudogap. This work demonstrates the potential of high field ESR in single crystals for studying high Tc superconductors. 74.25.Nf, 74.72.Bk, 76.30.Kg The structure of vortex lines in high temperature superconductors (HTSCs) may shed light on the microscopic mechanism of superconductivity. The earliest dwave pairing theories implied that the zero temperature spin susceptibility should scale with magnetic field as (B/H c2 ) 1/2 [1,2] in contrast to the linear dependence in an s-wave superconductor. A rigorous solution of the Bogoliubov-de Gennes equations in the mixed state [3] reveals that quasiparticles in d-wave superconductors are not bound to vortices, and predict a space averaged density of states (DOS) N (0) ∝ (B/H c2 ) γ , where 0.4 ≤ γ ≤ 1 depending on the temperature and the model used [4,5]. A number of experiments were targeted at the field dependence of the DOS in YBa 2 Cu 3 O 7−δ . Scanning tunneling microscopy [6] resolves the DOS at and around vortices, but is unsuitable to measure the total DOS [7]. Bulk experiments on nearly optimally doped YBa 2 Cu 3 O 7−δ include heat capacity [8], infrared transmission [9], thermal conductivity [10], and high field muon spin rotation [11]. Most of these experiments, together with early NMR on planar copper and oxygen [12], indicated some increase in the DOS with magnetic field but were inconclusive about its magnitude.Underdoped HTSCs-which also possess a pseudogap in the normal state-are of special interest, as it is unclear how the pseudogap is related to the d-wave superconducting gap. An indication whether high magnetic fields suppress the pseudogap or not may contribute to understanding its nature. Also, most theoretical calculations of the quasiparticle spectra in HTSCs depend on the assumption that Landau's theory of the Fermi-liquid is applicable below T c , which is still to be justified by experiments. A recent 63 Cu NMR study on YBa 2 Cu 4 O 8 at high fields [13] reports a sizeable field induced DOS for B in the (a, b) plane, implying a large enhancement for B c. In contrast, we show that for B c the DOS enhancement is small and incompatible with a suppression of the pseudogap at B = H c2 .In this Letter, we report the spin susceptibility of YBa 2 Cu 4 O 8 obtained by high field electron spin resonance (ESR) spectroscopy of Gd 3+ in Gd:3+ is a non-perturbing probe of the CuO 2 spin polarization [14]. We se...

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Antiferromagnetic domains inYBa2Cu3O6+

Cited by 43 publications

References 24 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9
Headings
¹
,
Hayden
²
,
Kulda
³

et al. 2011
Phys. Rev. B
32
2
26
1
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Magnetic-Field-Induced Low-Energy Spin Excitations inYBa2Cu4O8Measured b

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Antiferromagnetic domains inYBa2Cu3O6+

Cited by 43 publications

References 24 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9Headings1, Hayden2, Kulda3 et al. 2011Phys. Rev. B322261View full textAdd to dashboardCite

Magnetic-Field-Induced Low-Energy Spin Excitations inYBa2Cu4O8Measured b

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Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9
Headings
¹
,
Hayden
²
,
Kulda
³

et al. 2011
Phys. Rev. B
32
2
26
1
View full text Add to dashboard Cite