Neutron-scattering study of the dynamical spin susceptibility 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:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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></m

Tranquada, J. M.; Gehring, P. M.; Shirane, G.; Shamoto, S.; Sato, M.

doi:10.1103/physrevb.46.5561

Cited by 299 publications

(210 citation statements)

References 40 publications

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“…1 Neutron scattering experiments showed the decrease of low energy magnetic excitation with decreasing temperature and found precursor of a finite spin gap. 2 It has been pointed out that these astonishing experimental results can be explained provided that there is a spin pseudogap in the normal state of high T c materials. These phenomena indicating the spin pseudogap, however, have not been observed in the La 2−x Sr x CuO 4 systems.…”

Section: Introductionmentioning

confidence: 99%

Bilayer Heisenberg model studied by the Schwinger-boson Gutzwiller-projection method

1996

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Section: Introductionmentioning

confidence: 99%

Bilayer Heisenberg model studied by the Schwinger-boson Gutzwiller-projection method

1996

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“…Spin wave theory in particular has been remarkably good at predicting the magnetic excitations of static spin order in these systems. [4][5][6][7][8][9] Recent neutron scattering experiments show universal behavior in the high energy magnetic excitation spectra of three types of cuprate superconductors ͑YBCO, LBCO, and LSCO͒. 2 We are interested here in the high energy magnetic excitations of the related nickelate compounds, since the low energy scattering spectra are similar to the cuprates, yet without superconductivity.…”

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confidence: 99%

“…[4][5][6][7][8][9] In Ref. 9, many features of the neutron scattering data of La 3/2 Sr 1/2 NiO 4 were captured using spin wave theory based on a fourfold symmetric spin coupling pattern ͓i.e., that of Fig.…”

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confidence: 99%

Spin-wave dispersion in half-dopedLa3∕2Sr1∕2NiO4

Yao

Carlson²

2007

Phys. Rev. B

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“…YBCO; this explains the occurrence of incommensurate peaks in the spin spectrum along the same direction in momentum space in the latter materials [6][7][8].…”

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Magnetic coherence in cuprate superconductors

Morr

Pines

2000

Phys. Rev. B

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Recent inelastic neutron scattering (INS) experiments on La2−xSrxCuO4 observed a magnetic coherence effect, i.e., strong frequency and momentum dependent changes of the spin susceptibility, χ ′′ , in the superconducting phase. We show that this effect is a direct consequence of changes in the damping of incommensurate antiferromagnetic spin fluctuations due to the appearance of a d-wave gap in the fermionic spectrum. Our theoretical results provide a quantitative explanation for the weak momentum dependence of the observed spin-gap. Moreover, we predict (a) a Fermi surface in La2−xSrxCuO4 which is closed around (π, π) up to optimal doping, and (b) similar changes in χ ′′ for all cuprates with an incommensurate magnetic response.PACS numbers: 74.25. Ha, 74.25.Jb, The spin excitation spectrum in La 2−x Sr x CuO 4 [1][2][3][4][5] in the normal and superconducting state has been intensively studied during the last few years in inelastic neutron scattering (INS) experiments. The normal state spectrum for compounds with x > 0.04 is characterized by peaks in χ ′′ (q, ω) at incommensurate wave-vectors [5] show striking momentum and frequency dependent changes in χ ′′ upon entering the superconducting state, which the authors called the magnetic coherence effect. For both compounds, χ ′′ (Q i ) in the superconducting state is considerably decreased from its normal state value below ω ≈ 7 meV, while it increases above this frequency. For frequencies in the vicinity of 7 meV, the incommensurate peaks sharpen in the superconducting state, while at higher frequencies the peak widths in the normal and superconducting state are approximately equal. Moreover, by employing a Kramers-Kronig transformation, the authors found that the static susceptibility, χ ′ , at Q i decreases in the superconducting state [5].In this communication, we show that the magnetic coherence effect is a direct consequence of changes in the damping of incommensurate antiferromagnetic spin fluctuations due to the appearance of a d-wave gap in the fermionic spectrum. We obtain results for the frequency and momentum dependence of χ ′′ that are in good qualitative, and to a large extent quantitative agreement with the experimental data, and also explain the weak momentum dependence of the spin-gap. We show that INS data in the superconducting state provide information on the symmetry of the order parameter and the topology of the Fermi surface (FS) and that for La 2−x Sr x CuO 4 , INS experiments suggest a FS closed around (π, π). We predict that the magnetic coherence effect is to be expected for any cuprate superconductor with an incommensurate spin spectrum, and thus in particular for YBa 2 Cu 3 O 6+x (YBCO), in which an incommensurate spin structure at low frequencies has been observed [6][7][8].The starting point for our calculations is a spin-fermion model [9] in which the damping of incommensurate spinexcitations arises from their interaction with fermionic quasi-particles. In this model, the spin propagator, χ, is given bywhere χ 0 is the bare propa...

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Neutron-scattering study of the dynamical spin susceptibility inYBa2Cu3

Cited by 299 publications

References 40 publications

Bilayer Heisenberg model studied by the Schwinger-boson Gutzwiller-projection method

Bilayer Heisenberg model studied by the Schwinger-boson Gutzwiller-projection method

Spin-wave dispersion in half-dopedLa3∕2Sr1∕2NiO4

Magnetic coherence in cuprate superconductors

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