Magnetic excitations in pure, lightly doped, and weakly metallic<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:mrow></mml:msub></mml:mrow></m

Keimer, B.; Belk, N.; Birgeneau, R. J.; Cassanho, A.; Chen, Christine Y.; Greven, M.; Kastner, M. A.; Aharony, Amnon; Endoh, Y.; Erwin, R. W.; Shirane, G.

doi:10.1103/physrevb.46.14034

Cited by 628 publications

(599 citation statements)

References 59 publications

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“…These findings indicate that small Zn doping induces quasistatic AF ordering at low temperature by shifting the spectral weight from inelastic region. These results mirrored the behaviors seen in samples in the SG region [3,4] Suzuki et al [18] have obtained evidence for incommensurate magnetic order at low temperature in LSCO with x = 0.12 by using a double-axis neutron diffractometer. Detailed elastic neutron-scattering measurements were carried out by Kimura et al [19,20].…”

Section: Overview Of the Elastic Magnetic Peaks In Lscosupporting

confidence: 61%

“…(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. [3,4] (3) The superconductivity is realized in a certain hole concentration range (0.05 < x < 0.27), and T c becomes maximum around x = 0.15 [4][5][6]. (4) Inelastic magnetic peaks appear at four incommensurate positions equivalent to Q δ = (π, π) + δ(π, 0) of the CuO 2 square unit in the superconducting range [7]: Yamada et al [8] have shown that the incommensurability δ follows a simple empirical relation δ = x, then saturates around δ ∼ 1/8 beyond x ∼ 1/8.…”

Section: Introductionmentioning

confidence: 99%

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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: Overview Of the Elastic Magnetic Peaks In Lscosupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Hirota

2001

Physica C: Superconductivity

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“…At zero temperature, is exists up to x ≈ 0.2 and disappears for higher Sr concentrations [1]. * Electronic address: krueger@mf.mpg.de • symmetry-adapted to M ; and…”

Section: La2−xsrxcuo4mentioning

confidence: 99%

“…7 shows the spin structure of La 2 CuO 4 as determined by Keimer et al [1]. The space group is P ccn with the Bravais lattice Γ o .…”

Section: Antiferromagnetic La2cuo4mentioning

confidence: 99%

Antiferromagnetic, neutral, and superconducting band in La2CuO4

Krüger¹

2005

J Supercond

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The symmetry of the Bloch functions in the conduction band of tetragonal and orthorhombic La2CuO4 is examined for the existence of symmetry-adapted and optimally localizable (usual or spin-dependent) Wannier functions. It turns out that such Wannier functions do not exist in the tetragonal phase. In the orthorhombic phase, on the other hand, the Bloch functions can be unitarily transformed in three different ways into optimally localizable Wannier functions: they can be chosen to be adapted to each of the three phases observed in the pure or doped material, that is, to the antiferromagnetic phase, to the superconducting phase or to the phase evincing neither magnetism nor superconductivity. This group-theoretical result is proposed to be interpreted within a nonadiabatic extension of the Heisenberg model. Within this model, atomiclike states represented by these Wannier functions are responsible for the stability of each of the three phases. However, all the three atomiclike states cannot exist in the tetragonal phase, but are stabilized by the orthorhombic distortion of the crystal. A simple model is proposed which might explain the physical properties of La2−xSrxCuO4 as a function of the Sr concentration x.

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“…2) Antiferromagnetic (AF) bosonic spinons with a gap Jm ∼ J δ| ln δ| due to the interaction with the spin vortices, consistent with AF correlation length at small δ derived from neutron experiments [15]. 3) Slave-particle gauge fluctuations (in the normal state) dominated by the Reizer singularity [16], due to the finite FS of holons, with an anomalous skin momentum scale Q ∼ (T /t) 1/3 k 2/3 F .…”

Section: Implementation In the Spin-charge Gauge Approachmentioning

confidence: 67%