Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-Temperature<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>Superconductors

Kofu, Maiko; Sh, Lee; Fujita, M.; Hj, Kang; Eisaki, H.; Yamada, K.

doi:10.1103/physrevlett.102.047001

Cited by 65 publications

(81 citation statements)

References 44 publications

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“…On the other hand, this crystal is a good bulk superconductor with T c = 29 K, so it could be that there is a spin gap below T c in place of a SO-peak. 68 As one can see in Fig. 8, the SO-peak shifts to higher h with increasing x, reflecting a similar increase of δ as for the CO-peak; details will be discussed in Sec.…”

Section: Neutron Diffractionmentioning

confidence: 66%

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Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
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The correlations between stripe order, superconductivity, and crystal structure in La2−x Bax CuO4 single crystals have been studied by means of x-ray and neutron diffraction as well as static magnetization measurements. The derived phase diagram shows that charge stripe order (CO) coexists with bulk superconductivity in a broad range of doping around x = 1/8, although the CO order parameter falls off quickly for x = 1/8. Except for x = 0.155, the onset of CO always coincides with the transition between the orthorhombic and the tetragonal low temperature structures. The CO transition evolves from a sharp drop at low x to a more gradual transition at higher x, eventually falling below the structural phase boundary for optimum doping. With respect to the interlayer CO correlations, we find no qualitative change of the stripe stacking order as a function of doping, and in-plane and out-of-plane correlations disappear simultaneously at the transition. Similarly to the CO, the spin stripe order (SO) is also most pronounced at x = 1/8. Truly static SO sets in below the CO and coincides with the first appearance of in-plane superconducting correlations at temperatures significantly above the bulk transition to superconductivity (SC). Indications that bulk SC causes a reduction of the spin or charge stripe order could not be identified. We argue that CO is the dominant order that is compatible with SC pairing but competes with SC phase coherence. Comparing our results with data from the literature, we find good agreement if all results are plotted as a function of x ′ instead of the nominal x, where x ′ represents an estimate of the actual Ba content, extracted from the doping dependence of the structural transition between the orthorhombic phase and the tetragonal high-temperature phase.

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Section: Neutron Diffractionmentioning

confidence: 66%

“…As long as µSR detects static order, ND should as well, independent of a concomitant opening of a spin gap. 68 However, the weak CO-peak for x = 0.155 already suggests that any SO-peak will be extremely difficult to identify.…”

Section: Comparison With Lbco Nd-lsco and Eu-lscomentioning

confidence: 99%

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
View full text Add to dashboard Cite

show abstract

“…17,19,21,[32][33][34] In Fig. 1(a), we show a constant energy scan obtained with the spectrometer set to energy transferhω = 0 meV.…”

Section: Resultsmentioning

confidence: 99%

“…The available experimental evidence is, however, limited and a consistent interpretation is lacking. A recent doping-dependent study of the low-energy dynamics in LSCO by M. Kofu et al 21 reported a correlation between the presence of incommensurate elastic magnetic scattering and gapless spin excitations near x max . These data were interpreted in terms of two components: a spin-gapped response similar to what is observed at optimal doping, 22 i.e., a gap caused by superconductivity, and a second component related to spin stripe-ordered or stripe-frozen domains.…”

Section: Introductionmentioning

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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“…For HTS, the parent, undoped, compounds are Mott insulators which display three dimensional (3D), commensurate (C) antiferromagnetic (AF) ground states 12,13 . This 3D C AF ground state is remarkably sensitive to the presence of mobile, doped holes, and less sensitive to the presence of doped mobile electrons 14 .…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

et al. 2013

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We present neutron scattering measurements on single crystals of lightly doped La2−xBaxCuO4, with 0 ≤ x ≤ 0.035. These reveal the evolution of the magnetism in this prototypical doped Mott insulator from a three dimensional (3D) commensurate (C) antiferromagnetic ground state, which orders at a relatively high TN , to a two dimensional (2D) incommensurate (IC) ground state with finite ranged static correlations, which appear below a relatively low effective TN . At low temperatures, the 2D IC magnetism co-exists with the 3D C magnetism for doping concentrations as low as ∼ 0.0125. We find no signal of a 3D C magnetic ground state by x ∼ 0.025, consistent with the upper limit of x ∼ 0.02 observed in the sister family of doped Mott insulators, La2−xSrxCuO4. The 2D IC ground states observed for 0.0125 ≤ x ≤ 0.035 are diagonal, and are rotated by 45 degrees within the orthorhombic basal plane compared with those previously reported for samples with superconducting ground states: La2−xBaxCuO4, with 0.05 ≤ x ≤ 0.095. We construct a phase diagram based solely on magnetic order parameter measurements, which displays much of the complexity of standard high temperature superconductivity phase diagrams discussed in the literature. Analysis of high energy-resolution inelastic neutron scattering at moderately low temperatures shows a progressive depletion of the very low energy dynamic magnetic susceptibility as x increases from 0.0125 to 0.035. This low energy, dynamic susceptibility falls off with increasing temperature on a scale much higher than the effective 2D IC TN appropriate to these materials. Appreciable dynamic 2D IC magnetic fluctuations inhabit much of the "pseudogap" regime of the phase diagram.

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Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-TemperatureLa2−xSrxCuO4Superconductors

Cited by 65 publications

References 44 publications

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
View full text Add to dashboard Cite

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
View full text Add to dashboard Cite

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

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

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Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-TemperatureLa2−xSrxCuO4Superconductors

Cited by 65 publications

References 44 publications

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B308434112View full textAdd to dashboardCite

Stripe order in superconducting La2−xBaxCuOHücker1, Zimmermann2, Gu3 et al. 2011Phys. Rev. B308434112View full textAdd to dashboardCite

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

Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2−xBaxCuO

Contact Info

Product

Resources

About

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
View full text Add to dashboard Cite

Stripe order in superconducting La2−xBaxCuO
Hücker
¹
,
Zimmermann
²
,
Gu
³

et al. 2011
Phys. Rev. B
308
43
411
2
View full text Add to dashboard Cite