<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>63</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>89</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal" /><mml:mi mathvariant="normal">NMR</mml:mi></mml:math

Auler, T.; Horvatić, M.; Gillet, J.A.; Berthier, C.; Berthier, Y.; Ségransan, P.; Henry, J.Y.

doi:10.1103/physrevb.56.11294

Cited by 21 publications

(11 citation statements)

References 43 publications

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“…First, its correlation length ξ b along the b axis, i.e., parallel to the chains, shows no dependence on the oxygen order in the chain layers, and varies only weakly as a function of doping, which may indicate that local properties play a role. Second, we find a remarkable agreement between the CDW onset temperature T CDW and a temperature T † below which 1/(T 1 T ) decreases in planar 63 Cu NQR/NMR experiments. 52,[61][62][63][64] We argue that the opening of a CDW gap may influence the planar Cu spin dynamics.…”

Section: Introductionsupporting

confidence: 63%

“…56,[65][66][67][68] We argue that the maximum may indicate a response of the low energy spin fluctuations to the formation of the CDW. When plotted versus a common T c -scale, our results for YBa 2 Cu 3 O 6.44 with T c = 42 K are still slightly above the highest-T c sample (35 K) with confirmed SDW order, 55 and slightly below the lowest-T c samples with gapped magnetic excitations (48 K) 64 and quantum oscillations (54 K) 112 .…”

Section: 110mentioning

confidence: 99%

“…Associated effects By plotting all data versus Tc, ambiguities of plots versus the planar hole content p, due to different ways and difficulties of determining p, can be reduced. 52 We show the transition temperatures TCDW of CDW order measured by high energy x-rays 3,46 (closed circles) and soft x-ray scattering 2,47,93 (open circles), TCO of charge order detected by high field NMR 1,68 and high field sound velocity (vS) measurements 48 , T † determined from the maximum in 1/(T1T ) of planar 63 Cu NQR/NMR as explained in the text 56,[65][66][67][68] (open diamond), the pseudo gap temperature T * as detected by means of Nernst effect (open triangle) and resonant ultrasound measurements 87,88 (closed triangle), TSDW of SDW order (closed blue square) and TELC of a so called electronic liquid crystal state as determined by neutron scattering 55,63 (open blue square). Tc is indicated by a dashed line.…”

Section: 65-70mentioning

confidence: 99%

“…Second, we find a remarkable agreement between the CDW onset temperature T CDW and a temperature T † below which 1/(T 1 T ) decreases in planar 63 Cu NQR/NMR experiments. 56,[65][66][67][68][69][70] We argue that the opening of a CDW gap may influence the planar Cu spin dynamics. The derived phase diagrams strongly indicate that CDW order not only competes with SC, but also with SDW order.…”

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confidence: 99%

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Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

et al. 2014

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To explore the doping dependence of the recently discovered charge density wave (CDW) order in YBa2Cu3Oy, we present a bulk-sensitive high-energy x-ray study for several oxygen concentrations, including strongly underdoped YBa2Cu3O6.44. Combined with previous data around the so-called 1/8 doping, we show that bulk CDW order exists at least for hole concentrations (p) in the CuO2 planes of 0.078132. This implies that CDW order exists in close vicinity to the quantum critical point for spin density wave (SDW) order. In contrast to the pseudogap temperature T * , the onset temperature of CDW order decreases with underdoping to TCDW ∼ 90 K in YBa2Cu3O6.44. Together with a weakened order parameter this suggests a competition between CDW and SDW orders. In addition, the CDW order in YBa2Cu3O6.44 shows the same type of competition with superconductivity as a function of temperature and magnetic field as samples closer to p = 1/8. At low p the CDW incommensurability continues the previously reported linear increasing trend with underdoping. In the entire doping range the in-plane correlation length of the CDW order in b axis direction depends only very weakly on the hole concentration, and appears independent of the type and correlation length of the oxygen-chain order. The onset temperature of the CDW order is remarkably close to a temperature T † that marks the maximum of 1/(T1T ) in planar 63 Cu NQR/NMR experiments, potentially indicating a response of the spin dynamics to the formation of the CDW. Our discussion of these findings includes a detailed comparison to the charge stripe order in La2−x Bax CuO4.

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Section: Introductionsupporting

confidence: 63%

Section: 110mentioning

confidence: 99%

Section: 65-70mentioning

confidence: 99%

mentioning

confidence: 99%

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Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

et al. 2014

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“…This fact confirms that a distinction has to be made between the behavior of the spin susceptibility at q 0 and at q Q AF [12,20,21].…”

supporting

confidence: 65%

Isotope Dependence of the Spin Gap inYBa2Cu4O8as Determined by Cu NQR Re

et al. 1998

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We performed high accuracy 63 Cu NQR spin-lattice relaxation and SQUID magnetization measurements on 16 O and 18 O exchanged YBa 2 Cu 4 O 8 to determine the isotope shift of the temperature of the opening of the spin gap, T ‫ء‬ , and the superconducting transition temperature, T c . The corresponding isotope exponents are a T ‫ء‬ 0.061͑8͒ and a Tc 0.056͑12͒ which are the same within the error bars and suggest a common origin for the superconducting and the spin gap. [S0031-9007(98)08085-5] 74.25.Nf, 74.62.Dh One of the central and heavily debated questions in high-temperature superconductivity research concerns the origin of the so-called pseudogap occurring in the normal state of underdoped superconductors [1]. The pseudogap refers to the transfer to higher energy of the density of low-energy excited states. One may ask whether the pseudogap is caused by superconducting correlations, which develop above T c , or whether it is an independent phenomenon. In nuclear magnetic resonance (NMR) and neutron scattering experiments, the pseudogap reveals itself as a spin gap. For instance, the Cu spin-lattice "relaxation rate per temperature unit," ͑T 1 T ͒ 21 , increases with falling temperature and reaches a maximum at T ‫ء‬ , which is a proper scale for the temperature dependence of the spin gap. For YBa 2 Cu 4 O 8 (Y124), the corresponding values are T c 81 K and T ‫ء‬ ഠ 150 K.Recently [2], we detected anomalies in the temperature dependence of several NMR and NQR (nuclear quadrupole resonance) quantities measured in the normal state of Y124, for instance in NQR frequencies, Knight shifts, line widths, and relaxation times. These anomalies, which occur around T y 180 K, are the signature of an electronic crossover which involves enhanced charge fluctuations in planes and chains. Because of the proximity of T y and T ‫ء‬ , we have argued that the spin gap effect in Y124 is caused by a transition due to a charge density wave (CDW) instability [3]. Using the t-J model and including electron-phonon interaction, we could, among others, explain the strong temperature dependence of the magnetic shift of the planar Cu nuclei, which we had measured previously [4], and we predicted a dependence of T ‫ء‬ on the isotope mass. Thus, corresponding measurements allow one to check the consistency of the CDW model.NMR͞NQR are techniques that can determine the pseudogap with a precision allowing one to establish whether an isotope effect is present or not. Y124, because of its well-defined oxygen stoichiometry and its negligible oxygen diffusion, is the ideal compound for such a study that requires experimental results not hampered by reproducibility problems. Therefore, the NQR study of the isotope effect on the spin gap in Y124 and its comparison with the superconducting gap is a unique experiment to explore the relation between the two gaps.In this Letter, we report a high-accuracy NQR study of the planar 63 Cu nuclei, supplemented by susceptibility measurements, on 16 O and 18 O exchanged Y124 samples which revealed the presenc...

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5.4.5.1.2 LnBa2Cu3O(x) and LnBa3Cu4O8

Kazei¹,

Krynetskiĭ²

Perovskite-Type Layered Cuprates (High-T(c) Superconductors and Related Compounds)

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63Cuand89YNMR

Cited by 21 publications

References 43 publications

Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

Competing charge, spin, and superconducting orders in underdopedYBa2Cu3Oy

Isotope Dependence of the Spin Gap inYBa2Cu4O8as Determined by Cu NQR Re

5.4.5.1.2 LnBa2Cu3O(x) and LnBa3Cu4O8

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