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Reznik, D.; Pintschovius, L.; Reichardt, W.; Endoh, Y.; Hiraka, Haruhiro; Tranquada, J. M.; Tajima, S.; Uchiyama, Hiroshi; Masui, T.

doi:10.1023/a:1022978614613

Cited by 9 publications

(8 citation statements)

References 2 publications

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“…A PG filter in the final beam suppressed higher order contaminations. We note that the detwinned sample used in a previous study 17,18 was no longer available because this sample disintegrated on warming following the initial experiment.…”

Section: Methodsmentioning

confidence: 99%

“…17,18 Based on these calculations, measurements were made around the ͑3,0,0͒ ͑⌬ 1 symmetry͒ or the ͑3,0,2͒ reciprocal-lattice point ͑⌬ 4 symmetry͒. The twinning of our present sample complicated the assignment of the neutron peaks to the a ‫ء‬ or the b ‫ء‬ direction.…”

Section: A Oxygen Phonon Branches and Their Determinationmentioning

confidence: 99%

“…The experiments focused on the Cu-O in-plane bondstretching vibrations in the ͓100͔ and ͓010͔ directions because it was known from previous investigations [16][17][18] that these branches show an anomalous dispersion at low temperatures. These earlier studies had shown that the energies of the bond-stretching modes lie in the range of 55-75 meV for T Ͼ 200 K but extend to below 50 meV at low temperatures.…”

Section: A Oxygen Phonon Branches and Their Determinationmentioning

confidence: 99%

“…15 In previous work on YBa 2 Cu 3 O 6.95 , Chung et al 16 identified an anomaly in the anisotropic bond-stretching modes, with a strong temperature dependence below T c . Subsequent work by Pintschovius and co-workers, 17,18 involving a com-bination of measurements and model calculations, resolved the character of the anomaly. In particular, it was shown that the softening of the bond-stretching mode at the zone boundary would cause it to cross the lower-lying bond-bending mode; however, because the modes have the same symmetry, they mix and repel one another rather than actually crossing.…”

Section: Introductionmentioning

confidence: 97%

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Temperature dependence of the bond-stretching phonon anomaly inYBa2Cu3O6.95

et al. 2008

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We report the results of a detailed inelastic neutron-scattering study of renormalization of the bondstretching phonons in optimally doped YBa 2 Cu 3 O 6+x ͑YBCO͒. In agreement with previous work, this renormalization is strongest halfway to the zone boundary in the ͓010͔ direction where it manifests itself as a transfer of phonon spectral weight from ϳ60 to ϳ50 meV. Phonon renormalization begins on cooling from well above the superconducting transition temperature, T c , but strongly accelerates at T c . In contrast with the La 2−x Sr x CuO 4 system, where a similar longitudinal phonon anomaly occurs, the anomaly in YBCO appears to extend in the transverse direction along the branch that connects the longitudinal mode at the in-plane wave vector q in = ͑0 , 0.25͒ and the transverse bond-stretching mode at q in = ͑0.25, 0.25͒. Therefore, phonon renormalization in YBa 2 Cu 3 O 6.95 seems to be consistent with a quasi-one-dimensional behavior.

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Section: Methodsmentioning

confidence: 99%

Section: A Oxygen Phonon Branches and Their Determinationmentioning

confidence: 99%

Section: A Oxygen Phonon Branches and Their Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Temperature dependence of the bond-stretching phonon anomaly inYBa2Cu3O6.95

et al. 2008

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“…This similarly is true as regards the observed strong and very specific coupling into the problem of the basalplane Cu-O bond-stretching longitudinal optic phonons. Over the outer parts of the zone these particular phonons find themselves severely depressed in energy [41,46], and in a manner quite dissimilar to that for some regular Fermi surface dictated soft-mode CDW/PLD circumstance [47] (see §6). The fact that this coupling, as with the kink in the quasiparticle dispersion above, is observed too in the k,k,0 direction rules out any connection with stripe phase formation.…”

Section: {Figure 3}mentioning

confidence: 93%

Bosonic mode interpretation of novel scanning tunnelling microscopy and related experimental results, within boson–fermion modelling of cuprate high-temperature superconductivity

Wilson

2004

Philosophical Magazine

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This paper seeks to synthesize much recent work on the HTSC materials around the latest energy resolved scanning tunnelling microscopy (STM) results from Davis and coworkers.The STM conductance diffuse scattering results in particular are employed as point of entry to discuss bosonic modes, both of condensed and uncondensed form. The bosonic mode picture is essential to understanding an ever growing range of observations within the HTSC field. The work is expounded within the context of the site-inhomogeneous negative-U boson-fermion modelling long advocated by the author. This general approach is presently seeing much theoretical development, into which I have looked to couple many of the experimental advances.While this formal theory is not yet sufficiently detailed to cover adequately all the experimental complexities presented by the real cuprate systems, it is clear it affords very appreciable support to the line taken. An attempt is made throughout to clarify why and how it is that these novel circumstances and phenomena are tied so very closely to this particular set of materials.

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