Incommensurate Spin Dynamics of Underdoped Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>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>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>O</mml:mi></mml:mrow><mml:mrow><mml:mn>6.7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Arai, M.; Nishijima, T.; Endoh, Y.; Egami, T.; Tajima, S.; Tomimoto, K.; Shiohara, Yuh; Takahashi, Miwako; Garrett, A. W.; Bennington, S. M.

doi:10.1103/physrevlett.83.608

Cited by 275 publications

(339 citation statements)

References 23 publications

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“…The first clear signature that the excitations below the resonance are incommensurate, similar to the low-energy excitations in La 2−x Sr x CuO 4 [11,13], was obtained by Mook et al [34] for YBa 2 Cu 3 O 6.6 . That these incommensurate excitations disperse inwards towards the resonance energy was demonstrated in YBa 2 Cu 3 O 6.7 by Arai et al [35] and in YBa 2 Cu 3 O 6.85 by Bourges et al [36]. More recent measurements have established a common picture of the dispersion [27,37,38,28,39].…”

Section: Dispersionmentioning

confidence: 80%

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: Dispersionmentioning

confidence: 80%

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Tranquada

Handbook of High-Temperature Superconductivity

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“…Neutron scattering experiments on La 2−x Sr x CuO 4 (LSCO) clarified the doping evolution of spin excitation changing from the spin-wave excitation in the non-doped parent system to an hourglass-shaped one in the superconducting (SC) system [1]. Since the hourglass excitation can be seen in the SC phase of other family YBa 2 Cu 3 O 6+y (YBCO) and Bi 2 Sr 2 CaCu 2 O 8+y (Bi2212) [2,3], the existence of such a characteristic excitation is recognized to be universal in the hole-doped cuprate oxide. However, the details in the excitation spectrum of LSCO is somehow different from those in YBCO.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Excitation in Lightly-Doped Bi_2.4Sr_1.6CuO₆₊_y

Tsutsumi¹,

Fujita²,

Enoki³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We performed inelastic neutron scattering measurements in order to clarify the magnetic excitation of lightly-hole-doped Bi 2.4 Sr 1.6 CuO 6+y (Bi2201). At 7 K, a clear magnetic signal was observed up to 30 meV around (0.5, 0.5) reciprocal position, which corresponds to the antiferromagnetic zone center. The steeply extended excitation indicates the existence of high-energy spin excitation in the Bi2201 system, as was reported for La 2−x Sr x CuO 4 (LSCO). In the energy range between 10 meV and 30 meV, the intensity distribution in the momentum (h, k) plane is isotropic and the peak-width is wider than that in LSCO with the comparable hole-concentration. Furthermore, no well-defined inwardly dispersive excitation or the peak-sharpening with increasing the energy transfer was observed in the present Bi2201, unlike to the existence of hourglass-shaped excitation in LSCO.

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“…1 Examples of such systems in two dimensions include the following: type-I superconducting films in their intermediate state; 2 adsorbed monolayers on surfaces; 3 monomolecular film at air-water interfaces; 4 ferrimagnetic garnet films; 5 and doped antiferromagnets, on which there are a number of reports of magnetic and charge ordering. [6][7][8][9][10][11][12][13][14] Corresponding to those experimental reports, there have been a number of theoretical models intended to describe them. For example, numerous authors have studied Ising models that include a short-range ͑e.g., ferromagnetic͒ interaction plus a longer-ranged ͑e.g., antiferromagnetic͒ interaction.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity versus phase separation, stripes, and checkerboard ordering: A two-dimensional Monte Carlo study

Valdez-Balderas¹,

Stroud²

2005

Phys. Rev. B

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Using Monte Carlo techniques, we study a simple model which exhibits a competition between superconductivity and other types of order in two dimensions. The model is a site-diluted XY model, in which the XY spins are mobile, and also experience a repulsive interaction extending to one, two, or many shells of neighbors. Depending on the strength and range of the repulsion and spin concentration, the spins arrange themselves into a remarkable variety of patterns at low temperatures T, including phase separation, checkerboard order, and straight or labyrinthine patterns of stripes, which sometimes show hints of nematic or smectic order. This pattern formation profoundly affects the superfluid density ␥. Phase separation tends to enhance ␥, checkerboard order suppresses it, and stripe formation increases the component of ␥ parallel to the stripes and reduces the perpendicular one. We verify that ␥͑T =0͒ is proportional to the effective conductance of a random conductance network whose conductances equal the couplings of the XY system. Possible connections between the model and real materials, such as single high-T c cuprate layers, are briefly discussed.

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Incommensurate Spin Dynamics of Underdoped SuperconductorYBa2Cu3O6.7

Cited by 275 publications

References 23 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Magnetic Excitation in Lightly-Doped Bi_2.4Sr_1.6CuO₆₊_y

Superconductivity versus phase separation, stripes, and checkerboard ordering: A two-dimensional Monte Carlo study

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Incommensurate Spin Dynamics of Underdoped SuperconductorYBa2Cu3O6.7

Cited by 275 publications

References 23 publications

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

Magnetic Excitation in Lightly-Doped Bi2.4Sr1.6CuO6+y

Superconductivity versus phase separation, stripes, and checkerboard ordering: A two-dimensional Monte Carlo study

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Product

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Magnetic Excitation in Lightly-Doped Bi_2.4Sr_1.6CuO₆₊_y