Evidence for competing magnetic instabilities in underdoped YBa<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:

Balédent, V.; Haug, D.; Sidis, Y.; Hinkov, V.; Lin, C. T.; Bourges, P.

doi:10.1103/physrevb.83.104504

Cited by 58 publications

(92 citation statements)

References 45 publications

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“…[67] Rather, the CDW must be regarded as an instability inside the pseudogap regime. We also point out that the temperature dependence of the CDW correlations reported here does not track the one of the polar Kerr effect [68,69] and the q = 0 magnetic order detected by neutron diffraction [70][71][72], leaving open at this stage the relationship between the CDW fluctuations and these effects [73].…”

Section: Relation To the Pseudogap And Superconducting Fluctuationscontrasting

confidence: 55%

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

et al. 2014

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We report the results of a comprehensive study of charge density wave (CDW) correlations in untwinned YBa2Cu3O6+x single crystals with 0.4 ≤ x ≤ 0.99 using Cu-L3 edge resonant x-ray scattering (RXS). Evidence of CDW formation is found for 0.45 ≤ x ≤ 0.93 (hole doping levels 0.086 p 0.163), but not for samples with x ≤ 0.44 (p 0.084) that exhibit incommensurate spin-density-wave order, and in slightly overdoped samples with x = 0.99 (p ∼ 0.19). This suggests the presence of two proximate zero-temperature CDW critical points at pc1 ∼ 0.08 and pc2 ∼ 0.18. Remarkably, pc2 is close to the doping level that is optimal for superconductivity. The CDW reflections are observed at incommensurate in-plane wave vectors (δa, 0) and (0, δ b ) with δa δ b . Both δa and δ b decrease linearly with increasing doping, in agreement with recent reports on Bibased high-Tc superconductors, but in sharp contrast to the behavior of the La2−x(Ba,Sr)xCuO4 family. The CDW intensity and correlation length exhibit maxima at p ∼ 0.12, coincident with a plateau in the superconducting transition temperature Tc. The onset temperature of the CDW reflections depends non-monotonically on p, with a maximum of ∼ 160 K for p ∼ 0.12. The RXS reflections exhibit a uniaxial intensity anisotropy. Whereas in strongly underdoped samples the reflections at (δa, 0) are much weaker than those at (0, δ b ), the anisotropy is minimal for p ∼ 0.12, and reversed close to optimal doping. We further observe a depression of CDW correlations upon cooling below Tc, and (for samples with p ≥ 0.09) an enhancement of the signal when an external magnetic field up to 6 T is applied in the superconducting state. For samples with p ∼ 0.08, where prior work has revealed a field-enhancement of incommensurate magnetic order, the RXS signal is field-independent. This supports a previously suggested scenario in which incommensurate charge and spin orders compete against each other, in addition to individually competing against superconductivity (Blanco-Canosa et al., Phys. Rev. Lett. 110, 187001 (2013)). We discuss the relationship of these results to prior observations of "stripe" order in La2−x(Ba,Sr)xCuO4, the "pseudogap" phenomenon, superconducting fluctuations, and quantum oscillations, as well as their implications for the mechanism of high-temperature superconductivity.

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Section: Relation To the Pseudogap And Superconducting Fluctuationscontrasting

confidence: 55%

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

et al. 2014

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“…(iii) It was recently found that T mag for heavily underdoped YBCO 6.45 is substantially smaller than for YBCO 6.5 , and that the size of the ordered moment is dramatically reduced. 9 This may be an indication that the q = 0 magnetic order and the SDW order found in heavily underdoped YBCO 28,29 compete with each other. A similar scenario may explain why the q = 0 order in LSCO is short-range and only develops at relatively low temperature.…”

Section: 48mentioning

confidence: 99%

“…The experimental setup was similar to that in previous studies. [3][4][5]8,9 The incident neutron beam was monochromated (E i = 13.7 meV) by the (002) reflection of a double-focusing monochromator of pyrolytic graphite, and then spin-polarized by a supermirror (bender). The scattered neutrons were analyzed by the (111) reflection of Heusler alloy, which simultaneously selects the final neutron energy (for diffraction, E f = E i ) and spin polarization.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10][11][12][13][14] In particular, time-reversal symmetry is broken below the pseudogap temperature T * in at least four hole-doped cuprate families. [2][3][4][5][6][7][8][9][10] Meanwhile, there is increasing evidence that pre-formed Cooper pairs 15,16 exist only in a relatively limited temperature range above T c , 11,[17][18][19][20][21][22][23] well below T * , and are therefore unlikely to be responsible for the pseudogap phenomenon. These experimental facts strongly suggest that the pseudogap regime of the phase diagram is a genuine new phase of matter in close proximity to superconductivity.…”

Section: Introductionmentioning

confidence: 99%

“…It was not noticed in early measurements of YBCO and Hg1201 (refs. 3 and 5), but it was found and corrected for in the more recent studies of YBCO 4,9 , through measurements of a reference Bragg reflection. The primary undesirable consequence of this extrinsic effect is a systematic error in the estimate of the magnitude of the magnetic signal based on the type of analysis in Fig.…”

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confidence: 99%

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Magnetic order in the pseudogap phase of HgBa2CuO4+δstudied by spin-polarized neutron diffraction

et al. 2011

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(2008)], this establishes the universal existence of a genuine novel magnetic phase in underdoped cuprates with high maximal Tc (above 90 K at optimal doping). Here we report a systematic study of an underdoped Hg1201 sample (Tc = 75 K), the result of which is consistent with the previously established doping dependence of the magnetic signal. We present an assumption-free analysis of all the data available for Hg1201. Depending on how the hole concentration is estimated, comparison with the results for YBCO leads to different competition scenarios between the q = 0 magnetic order and the spin-density-wave order found in heavily underdoped YBCO.

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Quantized Repetitions of the Cuprate Pseudogap Line

Sacksteder

2020

J Supercond Nov Magn

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The cuprate superconductors display several characteristic temperatures which decrease as the material composition is doped, tracing lines across the temperature-doping phase diagram. Foremost among these is the pseudogap transition. At a higher temperature a peak is seen in the magnetic susceptibility, and changes in symmetry and in transport are seen at other characteristic temperatures. We report a meta-analysis of all measurements of characteristic temperatures well above Tc in strontium doped lanthanum cuprate (LSCO) and oxygen doped YBCO. The experimental corpus shows that the pseudogap line is one of a family of four straight lines which stretches across the phase diagram from low to high doping, and from Tc up to 700 K. These lines all originate from a single point near the overdoped limit of the superconducting phase and increase as doping is reduced. The slope of the pseudogap lines is quantized, with the second, third, and fourth lines having slopes that are respectively 1/2, 1/3, and 1/4 of the slope of the highest line. This pattern suggests that the cuprates host a single mother phase controlled by a 2-D sheet density which is largest at zero doping and which decreases linearly with hole density, and that the pseudogap lines, charge density wave order, and superconductivity are all subsidiary effects supported by the mother phase.

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Evidence for competing magnetic instabilities in underdoped YBa2Cu3O

Cited by 58 publications

References 45 publications

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

Magnetic order in the pseudogap phase of HgBa2CuO4+δstudied by spin-polarized neutron diffraction

Quantized Repetitions of the Cuprate Pseudogap Line

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