Glassy low-energy spin fluctuations and anisotropy gap in La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.88</mml:mn></mml:mrow></mml:msub></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.12</mml:mn></mml:mrow></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub><

Rømer, Astrid T.; Chang, J.; Christensen, Niels Bech; Andersen, Brian M.; Lefmann, Kim; Mähler, L.; Gavilano, J. L.; Gilardi, R.; Niedermayer, Ch.; Rønnow, Henrik M.; Schneidewind, A.; Link, P.; Oda, Masahiro; Ido, M.; Momono, N.; Mesot, J.

doi:10.1103/physrevb.87.144513

Cited by 28 publications

(31 citation statements)

References 46 publications

(93 reference statements)

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“…This is in agreement with the enhancement of the L = 0 signal in 7 T, observed in Ref. 33. Now we turn to the main purpose of the study, which is to map out the full L-dependence of the IC signal in field and zero field.…”

Section: Resultssupporting

confidence: 69%

“…The peak width is resolution limited and corresponds to a large in-plane correlation of ξ in−plane ≥ 120Å, consistent with earlier measurements finding resolution limited correlations in the (a, b) plane. 33 Due to the use of imaging mode the RITA-II experiment amounts to almost 80 individual scans. In Figure 2 (a,b), the data of five blades have been combined for an integration range of ∆L = 0.1 r.l.u.. For the individual scans the fitted center position of the peaks varies within ≈ 0.002 r.l.u.…”

Section: Resultsmentioning

confidence: 99%

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Field-induced interplanar magnetic correlations in the high-temperature superconductorLa1.88Sr0.12CuO4

et al. 2015

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We present neutron scattering studies of the inter-planar correlations in the high-temperature superconductor La1.88Sr0.12CuO4 (Tc = 27 K). The correlations are studied both in a magnetic field applied perpendicular to the CuO2 planes, and in zero field under different cooling conditions. We find that the effect of the magnetic field is to increase the magnetic scattering signal at all values of the out-of-plane wave vector L, indicating an overall increase of the magnetic moments. In addition, weak correlations between the copper oxide planes develop in the presence of a magnetic field. This effect is not taken into account in previous reports on the field effect of magnetic scattering, since usually only L ≈ 0 is probed. Interestingly, the results of quench-cooling the sample are similar to those obtained by applying a magnetic field. Finally, a small variation of the incommensurate peak position as a function of L provides evidence that the incommensurate signal is twinned with the dominating and sub-dominant twin displaying peaks at even or odd L, respectively.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Field-induced interplanar magnetic correlations in the high-temperature superconductorLa1.88Sr0.12CuO4

et al. 2015

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“…2(b) the doping dependence of the assumed out-of-plane anisotropy gap is shown, with the anisotropy gap energy defined to be the lowest energy at which maximum intensity occurs. We note that the reduction in the out-of-plane anisotropy gap of charge stripe ordered LSNO is similar to that reported for La 2−x Sr x CuO 4 [28].…”

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confidence: 87%

Magnetic excitations of the charge stripe electrons below half doping in La2−xSrxNiO4 ( x =<

et al. 2017

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The low energy magnetic excitation spectrum of charge stripe ordered La 2−x Sr x NiO 4 , x = 0.4 and x = 0.45 samples, were studied by neutron scattering. Two excitation modes are observed in both materials, one from the ordered magnetic moments, and a second mode consistent with pseudo-one-dimensional antiferromagnetic excitations of the charge stripe electrons (q-1D). The dispersion of the q-1D excitation follows the same relation as in x = 1/3 composition, with even spectral weight in the two counterpropagating branches of the x = 0.4 sample, however in the x = 0.45 sample only one dispersion branch has any measurable spectral weight. The evolution of the q-1D excitations on doping to the checkerboard charge ordered phase is discussed. DOI: 10.1103/PhysRevB.95.064403 Variation between the hourglass shaped magnetic excitation spectrum of the cuprates compared to the magnetic excitations of charge stripe ordered La 2−x Sr x NiO 4+δ (LSNO) has called into question the relevance of the charge stripe picture for the cuprates [1][2][3][4][5]. Recently however, it has been shown that insulating charge stripe ordered La 5/3 Sr 1/3 CoO 4+δ (LSCoO) has an hourglass shaped magnetic excitation spectrum that can be explained within a similar linear spin wave model used to describe charge stripe ordered LSNO [6]. In the charge stripe model the reason behind the different excitation spectrums is in part due to disorder, but mainly due to the relative strength of the interstripe magnetic interaction across the charge stripe, relative to the the intrastripe interaction [6]. For a weak interstripe interaction an hourglass excitation is observed, whereas a strong interaction leads to the symmetric spin wave cones observed in LSNO [3,5]. The role of disorder in wiping out the mode that disperses away from the antiferromagnetic position has been established in a charge stripe ordered manganate, these modes are present at base temperature but they have no measurable intensity on warming to the magnetic ordering temperature [7]. In the case of La 2−x Sr x CoO 4+δ an alternative scenario for the hourglass excitation spectrum arising from disordered checkerboard charge-ordered state has been proposed [8]. With the recent direct evidence of charge stripe order in La 2−x Sr x CoO 4+δ , the origin of the magnetic hourglass excitation spectrum is in dispute in this material [9].In LSNO magnetic excitations of the charge stripe electrons are observed [10], whereas half-filled charge stripes in the cuprates appear to have no interunit cell spin interactions, and * pgfreeman@uclan.ac.uk the spin state of the charge stripes in LSCoO is effectively S = 0 [1,2]. In the case of the cuprates there is evidence for a Q = 0 intraunit cell magnetic order from certain experimental techniques [11], this is apparently affected by charge stripe order in La-based cuprates possibly indicating the involvement of spins of half-filled stripes [12]. It is necessary to understand the magnetic interactions of the charge stripe electrons in LSNO to throw ligh...

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“…7(b), we plot the inelastic neutron scattering measurements of the intensity of the magnetic fluctuations from Ref. 36 for a similar sample and forhω = 0.3 meV and q = q SDW . The x-ray and neutron intensities track each other, even to the extent that both are suppressed on entering the superconducting state.…”

Section: Phase Diagrammentioning

confidence: 99%

Charge density wave fluctuations inLa2−xSrxCuO4and their competition

et al. 2014

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We report hard (14 keV) x-ray diffraction measurements on three compositions (x = 0.11, 0.12, 0.13) of the high-temperature superconductor La 2−x Sr x CuO 4 . All samples show charge-density-wave (CDW) order with onset temperatures in the range 51-80 K and ordering wavevectors close to (0.23,0,0.5). The CDW is strongest with the longest in-plane correlation length near 1/8 doping. On entering the superconducting state the CDW is suppressed, demonstrating the strong competition between the charge order and superconductivity. CDW order coexists with incommensurate magnetic order and the wavevectors of the two modulations have the simple relationship δ charge = 2δ spin . The intensity of the CDW Bragg peak tracks the intensity of the low-energy (quasi-elastic) spin fluctuations. We present a phase diagram of La 2−x Sr x CuO 4 including the pseudogap phase, CDW and magnetic order.

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

Cited by 28 publications

References 46 publications

Field-induced interplanar magnetic correlations in the high-temperature superconductorLa1.88Sr0.12CuO4

Field-induced interplanar magnetic correlations in the high-temperature superconductorLa1.88Sr0.12CuO4

Magnetic excitations of the charge stripe electrons below half doping in La2−xSrxNiO4 ( x =<

Charge density wave fluctuations inLa2−xSrxCuO4and their competition

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