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Wakimoto, Shuichi; Birgeneau, R. J.; Lee, Y. S.; Shirane, G.

doi:10.1103/physrevb.63.172501

Cited by 55 publications

(61 citation statements)

References 25 publications

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“…• No significant anomaly is observed at x c in the x dependence of the magnetic moment µ [25] as observed for the orthorhombicity [27].…”

Section: Spatial Structures Of Spin In Lscomentioning

confidence: 92%

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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“…• No significant anomaly is observed at x c in the x dependence of the magnetic moment µ [25] as observed for the orthorhombicity [27].…”

Section: Spatial Structures Of Spin In Lscomentioning

confidence: 92%

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Hirota

2001

Physica C: Superconductivity

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“…This is a generic result also expected to hold for stripeordered systems for which the static moments are known to be strongly diminished compared to La 2 CuO 4 . 40 The ordered moment in our sample was previously determined to be an order of magnitude smaller than that of La 2 CuO 4 . 19 Therefore, ignoring any additional effects due to quenched disorder produced by the replacement of La by Sr, we can expect anisotropy gaps in La 1.88 Sr 0.12 CuO 4 to be roughly an order of magnitude smaller than in La 2 CuO 4 .…”

Section: A Freezing and Glassinessmentioning

confidence: 99%

Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4<

et al. 2013

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We present high-resolution triple-axis neutron scattering studies of the high-temperature superconductor La 1.88 Sr 0.12 CuO 4 (T c = 27 K). The temperature dependence of the low-energy incommensurate magnetic fluctuations reveals distinctly glassy features. The glassiness is confirmed by the difference between the ordering temperature T N T c inferred from elastic neutron scattering and the freezing temperature T f 11 K obtained from muon spin rotation studies. The magnetic field independence of the observed excitation spectrum as well as the observation of a partial suppression of magnetic spectral weight below 0.75 meV for temperatures smaller than T f , indicate that the stripe frozen state is capable of supporting a spin anisotropy gap, of a magnitude similar to that observed in the spin and charge stripe-ordered ground state of La 1.875 Ba 0.125 CuO 4 . The difference between T N and T f implies that the significant enhancement in a magnetic field of nominally elastic incommensurate scattering is caused by strictly inelastic scattering-at least in the temperature range between T f and T c -which is not resolved in the present experiment. Combining the results obtained from our study of La 1.88 Sr 0.12 CuO 4 with a critical reappraisal of published neutron scattering work on samples with chemical composition close to p = 0.12, where local probes indicate a sharp maximum in T f (p), we arrive at the view that the low-energy fluctuations are strongly dependent on composition in this regime, with anisotropy gaps dominating only sufficiently close to p = 0.12 and superconducting spin gaps dominating elsewhere.

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“…Recent magnetic Raman scattering data on LSCO has been discussed in terms of such effects as well [11]. However, static order also exists at zero field in the underdoped phase of LSCO [6,7], and has been attributed to disorder [6]. In optimally doped LSCO, Kimura et al [12] did not detect ordered moments in pure and 1% Zn-substituted samples.…”

mentioning

confidence: 99%

“…For the most part, it has been assumed that the two forms of order compete and do not coexist, consistent with the vanishing of the Néel temperature T N before the onset of a superconducting critical temperature T c , and the suppression of T c near doping x = 1/8 where static stripe phases can be stable [1]. On the other hand, there have been persistent reports of static AF at low temperatures T in the superconducting phase at low doping, as measured by muon spin resonance (µSR) [2,3], nuclear magnetic resonance (NMR) [4,5], and elastic neutron scattering (NS) [6,7]. The NS experiments reveal an incommensurate (IC) ordering wavevector evident by a quartet of peaks surrounding (π, π).…”

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confidence: 99%

Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors

et al. 2007

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Using model calculations of a disordered d-wave superconductor with on-site Hubbard repulsion, we show how dopant disorder can stabilize novel states with antiferromagnetic order. We find that the critical strength of correlations or impurity potential necessary to create an ordered magnetic state in the presence of finite disorder is reduced compared to that required to create a single isolated magnetic droplet. This may explain why in cuprates like La2−xSrxCuO4(LSCO) low-energy probes have identified a static magnetic component which persists well into the superconducting state, whereas in cleaner systems like YBa2Cu3O 6+δ (YBCO) it is absent or minimal.PACS numbers: 74.25.Jb,74.25.Hc The occurrence of high-temperature superconductivity in cuprates near the antiferromagnetic (AF) phase of the parent compounds has prompted speculation since their discovery that superconductivity and magnetism were intimately related. For the most part, it has been assumed that the two forms of order compete and do not coexist, consistent with the vanishing of the Néel temperature T N before the onset of a superconducting critical temperature T c , and the suppression of T c near doping x = 1/8 where static stripe phases can be stable [1]. On the other hand, there have been persistent reports of static AF at low temperatures T in the superconducting phase at low doping, as measured by muon spin resonance (µSR) [2,3], nuclear magnetic resonance (NMR) [4,5], and elastic neutron scattering (NS) [6,7]. The NS experiments reveal an incommensurate (IC) ordering wavevector evident by a quartet of peaks surrounding (π, π). Since the neutron response is enhanced by an applied magnetic field [6,8,9] several authors have discussed it in terms of coexisting d-wave superconductivity (dSC) and field-induced spin density waves [10]. Recent magnetic Raman scattering data on LSCO has been discussed in terms of such effects as well [11]. However, static order also exists at zero field in the underdoped phase of LSCO [6,7], and has been attributed to disorder [6]. In optimally doped LSCO, Kimura et al. [12] did not detect ordered moments in pure and 1% Zn-substituted samples. An elastic peak similar to the pure underdoped material was observed when 1.7% Zn was added, however [12].Phenomena similar to those in LSCO have been observed in other materials, e.g. Y 1−x Ca x Ba 2 Cu 3 O 6 , and Bi 2 Sr 2 CaCu 2 O 8+x (BSCCO) where µSR directly reveals a slowing down and subsequent freezing of spin fluctuations as T is lowered [2,13]. On the other hand, experiments on optimally doped YBCO, even with significant percentages of Zn, have never detected static magnetic signals. While there have been reports of AF coexisting with dSC in underdoped YBCO, recent NS measurements on YBCO 6.5 found that AF order, while static from the point of view of NS timescales, 10 −10 s, was fluctuating faster than the timescale, 10 −6 s, for µSR. Thus, it appears that while in YBCO low-frequency AF fluctuations are present, they do not "freeze out". Recently, reports of st...

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Hole concentration dependence of the magnetic moment in superconducting and insulatingLa2−xSrx<

Cited by 55 publications

References 25 publications

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Neutron scattering studies of Zn-doped La2−xSrxCuO4

Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4<

Disorder-Induced Static Antiferromagnetism in Cuprate Superconductors

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