Structural effect on the static spin and charge correlations 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>1.875</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>0.125</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvari

Fujita, M.; Goka, H.; Yamada, K.; Matsuda, M.

doi:10.1103/physrevb.66.184503

Cited by 43 publications

(33 citation statements)

References 22 publications

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“…5. The T c thus determined is consistent with that determined from the magnetic susceptibility [13]. The upturn at low-T in the y = 0.05 sample is often observed in 214-systems displaying CO, such as LNSCO [29].…”

Section: Methodssupporting

confidence: 82%

“…Indeed in LBSCO, unlike in LNSCO, the in-plane structural distortion can be finely tuned by an increasing Ba → Sr substitution. Therefore T d2 could be measured, by either X-ray and neutron diffraction, as a function of y [6,12,13,14,15]. While 1/8-doped LSCO remains in the LTO phase at low T, all LBSCO samples with y < 0.09 show a low-T structural transition with a T d2 ranging from 30 K at y = 0.09 to 60 K at y = 0, as reported in Fig.…”

Section: Introductionmentioning

confidence: 91%

“…We selected two single crystals of LBSCO with the same hole doping (as confirmed by their spectral weight, see below) x = 0.125, but with different Ba concentrations. The one with y = 0.05 and T c = 10 K was in the LTT phase below T d2 = 40 K and exhibited static CO below T CO = T d2 , both in X-ray [12] and neutron [6,13] diffraction spectra. The other one, with y = 0.085 and T c = 31 K, was in the LTLO phase below T d2 = 30 K, but showed CO superlattice spots below a T CO ∼ 50 K > T d2 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
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The reflectivity R(ω) of both the ab plane and the c axis of two single crystals of La1.875Ba0.125−y SryCuO4 has been measured down to 5 cm −1 , using coherent synchrotron radiation below 30 cm −1 . For y = 0.085, a Josephson Plasma Resonance is detected at T ≪ Tc = 31 K in the out-of-plane Rc(ω), and a far-infrared peak (FIP) appears in the in-plane optical conductivity σ ab (ω) below 50 K, where non-static CO is reported by X-ray scattering. For y = 0.05 (Tc = 10 K), below the ordering temperature TCO, a FIP is again observed in σ ab (ω). The FIP then appears to be an infrared signature of CO, either static or fluctuating, as reported in previous works on the La-Sr cuprates.

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Section: Methodssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
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“…3, both SDW and CDW superlattice peaks were observed at low temperature, consistent with the observations for LNSCO and LBSCO. 6,24,25,32,44,60,61,62,63 Both the SDW and CDW peak-widths are resolution limited, corresponding to correlation lengths ξ m ≥ 150Å for the magnetic correlations and ξ ch ≥ 60Å for the lattice modulations. We note that the SDW and CDW peaks are found to be located at highly-symmetric positions of (0.5 ± δ, 0.5, 0)/(0.5, 0.5 ± δ, 0) and (2 ± ǫ, 0, 0), respectively, where δ = 0.118 and ǫ = 0.236 = 2δ.…”

Section: Results For Lbco a Static Correlationsmentioning

confidence: 99%

Stripe order, depinning, and fluctuations inLa1.875Ba0.125CuO4and
Fujita
¹
,
Goka
²
,
Yamada
³

et al. 2004
Phys. Rev. B
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We present a neutron scattering study of stripe correlations measured on a single crystal of La1.875Ba0.125CuO4. Within the low-temperature-tetragonal (LTT) phase, superlattice peaks indicative of spin and charge stripe order are observed below 50 K. For excitation energieshω ≤ 12 meV, we have characterized the magnetic excitations that emerge from the incommensurate magnetic superlattice peaks. In the ordered state, these excitations are similar to spin waves. Following these excitations as a function of temperature, we find that there is relatively little change in the Q-integrated dynamical spin susceptibility forhω ∼ 10 meV as stripe order disappears and then as the structure transforms from LTT to the low-temperature-orthorhombic (LTO) phase. The Qintegrated signal at lower energies changes more dramatically through these transitions, as it must in a transformation from an ordered to a disordered state. We argue that the continuous evolution through the transitions provides direct evidence that the incommensurate spin excitations in the disordered state are an indicator of dynamical charge stripes. An interesting feature of the thermal evolution is a variation in the incommensurability of the magnetic scattering. Similar behavior is observed in measurements on a single crystal of La1.875Ba0.075Sr0.050CuO4; maps of the scattered intensity in a region centered on the antiferromagnetic wave vector and measured athω = 4 meV are well reproduced by a model of disordered stripes with a temperature-dependent mixture of stripe spacings. We discuss the relevance of our results to understanding the magnetic excitations in cuprate superconductors.

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“…In fact, static stripe order has only been observed in compounds in which the average crystal structure for each CuO 2 plane exhibits a compatible reduction to rectangular symmetry. This is the case for the low-temperature-tetragonal (LTT) symmetry (space group P 4 2 /ncm) of La [174,175,176]. When diffraction peaks from orthogonal stripe domains are present simultaneously, one might ask whether the diffraction pattern is also consistent with a checkerboard structure (a superposition of orthogonal stripe domains in the same layer) [177].…”

Section: Stripes In Cupratesmentioning

confidence: 99%

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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Structural effect on the static spin and charge correlations inLa1.875Ba0.125−x

Cited by 43 publications

References 22 publications

Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
Self Cite
13
0
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Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
Self Cite
13
0
9
0
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Stripe order, depinning, and fluctuations inLa1.875Ba0.125CuO4and
Fujita
¹
,
Goka
²
,
Yamada
³

et al. 2004
Phys. Rev. B
Self Cite
327
45
358
1
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Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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Structural effect on the static spin and charge correlations inLa1.875Ba0.125−x

Cited by 43 publications

References 22 publications

Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCuOrtolani1, Calvani2, Lupi3 et al. 2006Phys. Rev. BSelf Cite13090View full textAdd to dashboardCite

Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCuOrtolani1, Calvani2, Lupi3 et al. 2006Phys. Rev. BSelf Cite13090View full textAdd to dashboardCite

Stripe order, depinning, and fluctuations inLa1.875Ba0.125CuO4andFujita1, Goka2, Yamada3 et al. 2004Phys. Rev. BSelf Cite327453581View full textAdd to dashboardCite

Neutron Scattering Studies of Antiferromagnetic Correlations in Cuprates

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Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
Self Cite
13
0
9
0
View full text Add to dashboard Cite

Effects of superconductivity and charge order on the subterahertz reflectivity ofLa1.875Ba0.125−ySryCu
Ortolani¹,
Calvani²,
Lupi³
et al. 2006
Phys. Rev. B
Self Cite
13
0
9
0
View full text Add to dashboard Cite

Stripe order, depinning, and fluctuations inLa1.875Ba0.125CuO4and
Fujita
¹
,
Goka
²
,
Yamada
³

et al. 2004
Phys. Rev. B
Self Cite
327
45
358
1
View full text Add to dashboard Cite