Comparison of charge modulations in La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1.875</mml:mn></mml:mrow></mml:msub></mml:math>Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.125</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></mml:math>and YBa<mm

Thampy, Vivek; Blanco-Canosa, S.; García-Fernández, Mirian; Dean, M. P. M.; Gu, Genda; Först, Michael; Loew, T.; Keimer, B.; Tacon, M. Le; Wilkins, S. B.; Hill, J. P.

doi:10.1103/physrevb.88.024505

Cited by 41 publications

(54 citation statements)

References 32 publications

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“…does not significantly depend on the material family. A similar conclusion was reached by resonant soft x-ray diffraction 49 . In contrast, the accompanying magnetic fluctuations are strongly familydependent, suggesting that charge order is an intrinsic feature of the CuO 2 planes around 1/8 doping, with the strength of associated spin fluctuations determined by the underlying AFM tendencies of the family.…”

Section: Discussionsupporting

confidence: 79%

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

Pelc¹,

Grafe²,

Gu³

et al. 2017

Phys. Rev. B

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We present a Cu nuclear magnetic/quadrupole resonance study of the charge stripe ordered phase of LBCO, with detection of previously unobserved ('wiped-out') signal. We show that spin-spin and spin-lattice relaxation rates are strongly enhanced in the charge ordered phase, explaining the apparent signal decrease in earlier investigations. The enhancement is caused by magnetic, rather than charge fluctuations, conclusively confirming the long-suspected assumption that spin fluctuations are responsible for the wipeout effect. Observation of the full Cu signal enables insight into the spin and charge dynamics of the stripe-ordered phase, and measurements in external magnetic fields provide information on the nature and suppression of spin fluctuations associated with charge order. We find glassy spin dynamics, in agreement with previous work, and incommensurate static charge order with charge modulation amplitude similar to other cuprate compounds, suggesting that the amplitude of charge stripes is universal in the cuprates.

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Section: Discussionsupporting

confidence: 79%

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

Pelc¹,

Grafe²,

Gu³

et al. 2017

Phys. Rev. B

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“…peak below T c [ Fig. 3(b)] shows that soft CCMs are suppressed by superconductivity and compete with it, in analogy to what has been observed in YBCO, where the soft CCM peak weakens and broadens below T c , but is restored by an external magnetic field [8,10,11,13]. We note that at T c the soft CCM peak is broader in Bi2212 than in YBCO, and that the incommensurate wave vector is slightly different.…”

Section: K From Experiments No2 [Black Triangles Insupporting

confidence: 71%

“…On the other hand, a short range checkerboard or stripe-like order over a wide doping range has been re- [4,[6][7][8] ported by STM [19][20][21][22][23]. The characteristic wave vector is q ≃ 0.25 r.l.u.…”

Section: K From Experiments No2 [Black Triangles Inmentioning

confidence: 99%

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Direct observation of bulk charge modulations in optimally dopedBi1.5Pb0.6Sr1.54CaCu2O8+

et al. 2014

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Bulk charge density modulations, recently observed in high critical-temperature (Tc) cuprate superconductors, coexist with the so-called pseudogap and compete with superconductivity. However, its direct observation has been limited to a narrow doping region in the underdoped regime. Using energy-resolved resonant x-ray scattering we have found evidence for such bulk charge modulations, or soft collective charge modes (soft CCMs), in optimally doped Bi1.5Pb0.6Sr1.54CaCu2O 8+δ (Pb-Bi2212) around the summit of the superconducting dome with momentum transfer q ∼ 0.28 reciprocal lattice units (r.l.u.) along the Cu-O bond direction. The signal is stronger at T ≃ Tc than at lower temperatures, thereby confirming a competition between soft CCMs and superconductivity. These results demonstrate that soft CCMs are not constrained to the underdoped regime, suggesting that soft CCMs appear across a large part of the phase diagram of cuprates and are intimately entangled with high-Tc superconductivity.

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“…Under the assumption that all of the measurements are probing the same CDW correlations, it has been proposed that the X-ray measurements might be integrating over fluctuating CDW correlations, which would not be detectable by NMR 48,49 . There are problems with such an interpretation, however, a recent study 50 has shown that the integrated intensity of a CDW peak in YBa 2 Cu 3 O 6.6 is quite similar to one in charge-stripe-ordered La 1 NiO 4 , our results directly demonstrate that charge-stripe fluctuations exist far above T co , whereas elastic X-ray scattering measurements 16 lost the signal by T co þ 20 K. This strongly suggests that the X-ray studies of YBa 2 Cu 3 O 6 þ x are measuring static correlations. (Note that recent inelastic X-ray scattering measurements 51 have narrowed the possible energy range of fluctuations to something less than 1 meV.)…”

Section: Discussionmentioning

confidence: 97%

Direct observation of dynamic charge stripes in La2–xSrxNiO4

Anissimova

Parshall

et al. 2014

Nat Commun

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The insulator-to-metal transition continues to be a challenging subject, especially when electronic correlations are strong. In layered compounds, such as La 2-x Sr x NiO 4 and La 2-x Ba x CuO 4 , the doped charge carriers can segregate into periodically spaced charge stripes separating narrow domains of antiferromagnetic order. Although there have been theoretical proposals of dynamically fluctuating stripes, direct spectroscopic evidence of charge-stripe fluctuations has been lacking. Here we report the detection of critical lattice fluctuations, driven by charge-stripe correlations, in La 2-x Sr x NiO 4 using inelastic neutron scattering. This scattering is detected at large momentum transfers where the magnetic form factor suppresses the spin fluctuation signal. The lattice fluctuations associated with the dynamic charge stripes are narrow in q and broad in energy. They are strongest near the charge-stripe melting temperature. Our results open the way towards the quantitative theory of dynamic stripes and for directly detecting dynamical charge stripes in other strongly correlated systems, including high-temperature superconductors such as La 2-x Sr x CuO 4 .

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Comparison of charge modulations in La1.875Ba0.125CuO4and YBa

Cited by 41 publications

References 32 publications

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

Cu nuclear magnetic resonance study of charge and spin stripe order inLa1.875Ba0.125CuO4

Direct observation of bulk charge modulations in optimally dopedBi1.5Pb0.6Sr1.54CaCu2O8+

Direct observation of dynamic charge stripes in La2–xSrxNiO4

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