Neutron scattering study of the magnetic phase diagram of underdoped YBa2Cu3O6+x

Haug, D.; Hinkov, V.; Sidis, Y.; Bourges, P.; Christensen, Niels Bech; Ivanov, A.; Keller, T.; Lin, C. T.; Keimer, B.

doi:10.1088/1367-2630/12/10/105006

Cited by 171 publications

(253 citation statements)

References 71 publications

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“…1(a)-( transverse scan C shows no structure. The pattern is identical to that observed in the superconducting phase of LSCO [27] and twinned YBCO [28,29]; however, the intensity at this and lower energies is weak compared to that from LSCO for the same p and mass, measured under identical experimental setups.…”

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confidence: 78%

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

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We have performed inelastic neutron scattering measurements on the single-layer cuprate Bi2+xSr2−xCuO6+y (Bi2201) with x=0.2, 0.3, 0.4 and 0.5, a doping range that spans the spinglass (SG) to superconducting (SC) phase boundary. The doping evolution of low energy spin fluctuations ( 11 meV) was found to be characterized by a change of incommensurate modulation wave vector from the tetragonal [110] to [100]/[010] directions, while maintaining a linear relation between the incommensurability and the hole concentration, δ ≈ p. In the SC regime, the spectral weight is strongly suppressed below ∼ 4 meV. Similarities and differences in the spin correlations between Bi2201 and the prototypical single-layer system La2−xSrxCuO4 are discussed.The relevance of charge and spin stripes to the phenomenology of hole-doped cuprate superconductors has been gaining currency in recent years. For example, intriguing similarities in the transport properties of stripeordered cuprates and YBa 2 Cu 3 O 6+y (YBCO) in a high magnetic field have been demonstrated [1,2]. In fact, direct evidence for field-induced charge-stripe order in YBCO was recently obtained in a nuclear magnetic resonance study [3]. The impact of stripe order on the Fermi surface [4,5] has been proposed as one possible explanation for the appearance of quantum oscillations [6,7] (though there are challenges with the simplest approaches [8]). There is also evidence of closely related nematic order [9] from Nernst-effect measurements on YBCO [10] as well as from spectroscopic imaging of Bi 2 Sr 2 CaCu 2 O 8+y with scanning tunneling microscopy (STM) [11,12].Some of the most stimulating evidence comes from real-space imaging of electronic modulations by STM in Bi 2 Sr 2 CaCu 2 O 8+y [13][14][15] and in Bi 2−x Pb x Sr 2−z La z CuO 6+y [16].These short-range correlations are found to have a period of approximately 4a, where a = 3.8Å is the lattice spacing along a Cu-O bond direction. The corresponding wave vector of the modulations, q STM , is ( 1 4 , 0, 0) in reciprocal lattice units (2π/a); q STM is observed to decrease with doping, varying in the range of 0.3 to 0.15 [15,16].Identifying q STM with the wave vector q co associated with charge stripe order in cuprates such as La 2−x Ba x CuO 4 [17] leads to a conundrum, as q co grows with doping (at least for hole concentrations p 1/8 [18]), opposite to the behavior of q STM . When spin stripe order also occurs, antiferromagnetic spin correlations are modulated at q so = 1 2 q co . It is often possible to observe incommensurate (IC) spin fluctuations split about the antiferromagnetic wave vector Q AF by q δ ≈ q so even when there is no significant stripe order, as in La 2−x Sr x CuO 4 (LSCO) [19,20]. Among possible resolutions of the conundrum, it might be that the nature of stripe correlations is not universal among different cuprate families, or that q STM measures something complementary to q co .In this Letter, we present the results of inelastic neutron scattering measurements of low-energy spin excitations in the sys...

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confidence: 78%

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

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“…is consistent with the linear doping dependence observed in YBCO 6+δ . [27,35] We have reproduced the corresponding low-energy neutron scattering data in Fig. 3b.…”

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confidence: 54%

“…[25,26] For δ < 0.5, uniaxial incommensurate magnetic order forms gradually upon cooling and coexists with superconductivity at low temperatures. [2,27] Unlike the well known "striped" state in the (La,Nd,Eu) 2−x (Ba,Sr) x CuO 4 (214) family, [5,[10][11][12][13][14] which encompasses both spin and charge degrees of freedom, a corresponding charge modulation has not been found in the low-doping regime of YBCO 6+δ . For δ > 0.5, on the other hand, static magnetic order disappears, and the magnetic excitation spectrum determined by neutron scattering exhibits a large spin gap.…”

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confidence: 92%

“…Apart from the modified Fermi surface geometry, the strong overall intensity reduction of the CDW peaks triggered by the small reduction of the hole content may reflect the influence of spin correlations, which are strongly enhanced in YBCO 6+δ with δ < 0.5 where neutron scattering has revealed quasi-static incommensurate magnetic reflections. [2,27,33] The CDW wave vector is unrelated to the wave vector characterizing magnetic order in samples of composition YBCO 6.45 (immediately adjacent in the phase diagram), [2,27] suggesting that incommensurate spin and charge order are competing in the YBCO 6+δ system.…”

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confidence: 99%

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Momentum-Dependent Charge Correlations inYBa2Cu3O6+δSuperconductors Probed by Resonant X-Ray Scattering: Evidence for Three Competing Phases

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We have used resonant x-ray scattering to determine the momentum dependent charge correlations in YBa2Cu3O6.55 samples with highly ordered chain arrays of oxygen acceptors (ortho-II structure). The results reveal nearly critical, biaxial charge density wave (CDW) correlations at in-plane wave vectors (0.315, 0) and (0, 0.325). The corresponding scattering intensity exhibits a strong uniaxial anisotropy. The CDW amplitude and correlation length are enhanced as superconductivity is weakened by an external magnetic field. Analogous experiments were carried out on a YBa2Cu3O6.6 crystal with a dilute concentration of spinless (Zn) impurities, which had earlier been shown to nucleate incommensurate magnetic order. Compared to pristine crystals with the same doping level, the CDW amplitude and correlation length were found to be strongly reduced. These results indicate a three-phase competition between spin-modulated, charge-modulated, and superconducting states in underdoped YBa2Cu3O 6+δ .PACS numbers: 74.20. Rp, 74.25.Gz, 74.25.Kc, 74.72.Bk High-temperature superconductivity in the cuprates arises from doping of charge carriers into Mott-insulators with antiferromagnetically ordered CuO 2 planes.[1] At sufficiently high density, the carriers screen out the random potential created by the donor or acceptor atoms and generate a uniform metallic state out of which superconductivity arises. In underdoped cuprates, however, the screening is less effective, and the role of materialsspecific disorder in the formation of the unusual spin and/or charge textures observed in this regime of the phase diagram has been a subject of long-standing debate. [2-16] Recent research on the stoichiometric underdoped compounds YBa 2 Cu 3 O 6.5 and YBa 2 Cu 4 O 8 has provided new perspectives for the resolution of the influence of disorder on the electronic phase behavior of the underdoped cuprates. In these materials, the oxygen acceptors are arranged in ordered chains rather than placed randomly in the crystal lattice, so that chemical and structural disorder is minimized.[17] The results of recent quantum oscillation experiments [18][19][20] in high magnetic fields indicate a reconstruction of the Fermi surface by a long-range electronic superstructure. [21][22][23] This discovery has sparked another intense debate on the nature of the high-field ordering and its relation to the "pseudogap" observed in these and other underdoped cuprates [24] above the superconducting transition temperature, T c , in the absence of external fields. The pseudogap, in turn, is intimately related to the superconducting gap, and an explanation of its origin is considered an essential element of any theory of high-temperature superconductivity.Whereas research on YBa 2 Cu 4 O 8 has been limited, because only small crystals are available and the doping level cannot be varied in a straightforward manner, YBa 2 Cu 3 O 6.5 is a member of the extensively studied YBa 2 Cu 3 O 6+δ (YBCO 6+δ , 123) family, where the concentration of mobile holes in the CuO 2 layer...

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“…Here, we have two systems, in which as noted earlier, the charge correlations differ in significant ways, the most important being, perhaps, the different wavevectors for the modulations. Another important distinction is the absence of magnetic order in YBCO for the doping considered here [30][31][32], as opposed to LBCO where the uniaxial arrangement of the charges delineates the anti-ferromagnetically ordered regions to form the socalled stripes. Despite these distinctions, we find that the amplitudes of the associated lattice modulations in the two systems are comparable in magnitude.…”

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confidence: 99%

Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
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A charge modulation has recently been reported in (Y,Nd)Ba2Cu3O6+x [Ghiringhelli et al. Science 337, 821 (2013)]. Here we report Cu L3 edge soft x-ray scattering studies comparing the lattice modulation associated with the charge modulation in YBa2Cu3O6.6 with that associated with the well known charge and spin stripe order in La1.875Ba0.125CuO4. We find that the correlation length in the CuO2 plane is isotropic in both cases, and is 259 ± 9Å for La1.875Ba0.125CuO4 and 55 ± 15Å for YBa2Cu3O6.6. Assuming weak inter-planar correlations of the charge ordering in both compounds, we conclude that the order parameters of the lattice modulations in La1.875Ba0.125CuO4 and YBa2Cu3O6.6 are of the same order of magnitude.

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Neutron scattering study of the magnetic phase diagram of underdoped YBa₂Cu₃O_6+x

Cited by 171 publications

References 71 publications

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

Momentum-Dependent Charge Correlations inYBa2Cu3O6+δSuperconductors Probed by Resonant X-Ray Scattering: Evidence for Three Competing Phases

Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
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Neutron scattering study of the magnetic phase diagram of underdoped YBa2Cu3O6+x

Cited by 171 publications

References 71 publications

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

Spin-Stripe Density Varies Linearly With the Hole Content in Single-LayerBi2+xSr2−xCuO6+yCuprate

Momentum-Dependent Charge Correlations inYBa2Cu3O6+δSuperconductors Probed by Resonant X-Ray Scattering: Evidence for Three Competing Phases

Comparison of charge modulations in La1.875Ba0.125CuO4and YBaThampy1, Blanco-Canosa2, García-Fernández3 et al. 2013Phys. Rev. B415490View full textAdd to dashboardCite

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Neutron scattering study of the magnetic phase diagram of underdoped YBa₂Cu₃O_6+x

Comparison of charge modulations in La1.875Ba0.125CuO4and YBa
Thampy
¹
,
Blanco-Canosa
²
,
García-Fernández
³

et al. 2013
Phys. Rev. B
41
5
49
0
View full text Add to dashboard Cite