Antiferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</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">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">y</mml:mi><

Vaknin, David; Sinha, Sunil K.; Moncton, D. E.; Johnston, D. C.; Newsam, J. M.; Safinya, Cyrus R.; King, H. E.

doi:10.1103/physrevlett.58.2802

Cited by 1,131 publications

(276 citation statements)

References 18 publications

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“…In particular, La 2−x Sr x CuO 4 (LSCO) has been extensively studied by neutron scattering, because LSCO has the simplest crystal structure among high-T c superconductors. The following things had been clarified by mid 1990's: (1) The mother compound La 2 CuO 4 is three-dimensional antiferromagnetic (AF) insulator [2]. (2) The AF ordering is destroyed by a slight hole doping (x ∼ 0.02), and the spin glass (SG) phase appears, in which commensurate two-dimensional (2D) short-range AF fluctuations are observed.…”

Section: Introductionmentioning

confidence: 99%

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Hirota

2001

Physica C: Superconductivity

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This paper reviews studies of the spatial modulation of spin in La2−xSrxCuO4 (LSCO) through neutron-scattering measurements of the elastic magnetic peaks, with emphasis on Zn-doped LSCO. The elastic incommensurate magnetic peaks can be categorized in two classes with respect to the temperature dependence. Nd-doped LSCO, La2CuO4+y and LSCO with x ∼ 1/8 exhibit an ordinary power law behavior. On the other hand, Zn-doped LSCO and LSCO with x = 0.02 − 0.07 show an exponential temperature dependence, and the correlation lengths stay short. This discrepancy can be attributed to the difference in the mechanism of pinning spin fluctuations. The former systems have pinning centers which is coherent to the lattice. In the latter, however, pinning centers are randomly scattered in the CuO2 planes, thus incoherent. The incoherent pinning model is discussed with referring to recent µSR studies.

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Section: Introductionmentioning

confidence: 99%

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Hirota

2001

Physica C: Superconductivity

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“…A generic property of such correlations is the contribution of slowly decaying tails of the underlying probability distribution to the averaged quantities. This leads to random walks, with a nonvanishing occurrence of long jumps [3][4][5] , as well as long-range ordering effects in organic and inorganic materials 2,[6][7][8][9] . Spin-1/2 chains with antiferromagnetic interaction, so called the spinPeierls systems 10,11 , as well as cross-coupled spin-1/2 chains, so called the spin-ladder systems 12,13 , are both prime examples of solids with long-range ordered phases.…”

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confidence: 99%

The random mass Dirac model and long-range correlations on an integrated optical platform

et al. 2013

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Long-range correlation-the non-local interdependence of distant events-is a crucial feature in many natural and artificial environments. In the context of solid state physics, impurity spins in doped spin chains and ladders with antiferromagnetic interaction are a prominent manifestation of this phenomenon, which is the physical origin of the unusual magnetic and thermodynamic properties of these materials. It turns out that such systems are described by a one-dimensional Dirac equation for a relativistic fermion with random mass. Here we present an optical configuration, which implements this one-dimensional random mass Dirac equation on a chip. On this platform, we provide a miniaturized optical test-bed for the physics of Dirac fermions with variable mass, as well as of antiferromagnetic spin systems. Moreover, our data suggest the occurence of long-range correlations in an integrated optical device, despite the exclusively short-ranged interactions between the constituting channels.

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“…Powder neutron diffraction studies first demonstrated this for La 2 CuO 4 [2], and later for YBa 2 Cu 3 O 6+x [54]. The magnetic moments tend to lie nearly parallel to the CuO 2 planes.…”

Section: Antiferromagnetic Ordermentioning

confidence: 98%

“…8 In the antiferromagnetic phase of La 2 CuO 4 , the spins point along the b O axis, and they have the stacking sequence shown in Fig. 8.7 [2,57]. As the octahedral tilts break the tetragonal symmetry of the planes, they allow spin-orbit effects, in the form of Dzyalozhinsky-Moriya (DM) antisymmetric exchange, to cause a slight canting of the spins along the c axis.…”

Section: Antiferromagnetic Ordermentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

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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Antiferromagnetism inLa2CuO4−y<

Cited by 1,131 publications

References 18 publications

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Neutron scattering studies of Zn-doped La2−xSrxCuO4

The random mass Dirac model and long-range correlations on an integrated optical platform

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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