J. G. Bednorz and K. A. Muller, Possible high-tc superconductivity in the Ba-La-Cu-O system, Z. Phys. B Condens. Matter, vol.64, p.17, 1986.

B. Keimer, S. A. Kivelson, M. R. Norman, S. Uchida, and J. Zaanen, From quantum matter to high-temperature superconductivity in copper oxides, Nature, vol.518, pp.179-186, 2015.

A. Ono, Superconductivity in Cr-1212 cuprates Sr2-xBaxYCu2.8Cr0.2Oz, Jpn. J. Appl. Phys, vol.34, p.1528, 1995.

A. Ono, YCu(2.8)M(0.2)O(z) (M=Ti, Ga, Ge, Al), Oxygenation and critical-temperature optimization in M-1212 cuprates, vol.35, p.19, 1996.

D. Haskel, E. A. Stern, D. G. Hinks, A. W. Mitchell, and J. D. Jorgensen, Altered Sr environment in La 2-x Sr x CuO 4, Phys. Rev. B, vol.56, p.20, 1997.

S. D. Conradson, Local lattice distortions and dynamics in overdoped YSr 2 Cu 2.75 Mo 0.25 O 7.54, Proc. Natl. Acad. Sci. U.S.A, p.21, 2019.
URL : https://hal.archives-ouvertes.fr/hal-02484583

A. Gauzzi, Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates, Phys. Rev. B, vol.94, p.180509, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01420833

W. M. Li, Superconductivity in a unique type of copper oxide, Proc. Natl. Acad. Sci. U.S.A, vol.116, pp.12156-12160, 2019.

D. Rybicki, M. Jurkutat, S. Reichardt, C. Kapusta, and J. Haase, Perspective on the phase diagram of cuprate high-temperature superconductors, Nat. Commun, vol.7, p.11413, 2016.

E. S. Bozin, Charge-screening role of c-axis atomic displacements in YBa 2 Cu 3 O 6+x and related superconductors, Phys. Rev. B, vol.93, p.54523, 2016.

Y. Y. Peng, Influence of apical oxygen on the extent of in-plane exchange interaction in cuprate superconductors, Nat. Phys, vol.13, pp.1201-1206, 2017.

S. Kim, X. Chen, W. Fitzhugh, and X. Li, Apical charge flux-modulated in-plane transport properties of cuprate superconductors, Phys. Rev. Lett, vol.121, p.157001, 2018.

M. Takano, M. Azuma, Z. Hiroi, Y. Bando, and Y. Takeda, Superconductivity in the Ba-Sr-Cu-O system, Physica C, vol.176, pp.441-444, 1991.

W. M. Li, Synthesis and structure stability of Ba2CuO3+delta under high pressure, Int. J. Mod. Phys. B, vol.29, p.15420242, 2015.

Z. Hiroi, M. Takano, M. Azuma, and Y. Takeda, A new family of copper-oxide superconductors SrN+1CuNO2N+1+delta stabilized at high-pressure, Nature, vol.364, pp.315-317, 1993.

H. Yang, Q. Q. Liu, F. Y. Li, C. Q. Jin, and R. C. Yu, TEM and EELS characterization of a Sr2CuO3+delta superconductor post-annealed at different temperatures: Enhancement of T-c by apical oxygen reordering, Supercond. Sci. Technol, vol.20, pp.904-910, 2007.

W. Liang, Growth of Sr 2 CuO 3+delta superconductor single crystals at high pressure, Sci. China Phys. Mech. Astron, vol.56, pp.691-693, 2013.

Y. Liu, A new modulated structure in Sr 2 CuO 3+delta superconductor synthesized under high pressure, Physica C, vol.497, pp.34-37, 2014.

P. S. Hafliger, Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4, Phys. Rev. B, vol.89, p.85113, 2014.
URL : https://hal.archives-ouvertes.fr/hal-00954686

C. L. Teske and H. Muller-buchsbaum, Alkaline earth metals oxocuprate. 2. Sr 2 CuO 3, Z. Anorg. Allg. Chem, vol.371, p.325, 1969.

K. R. Thurber, A. W. Hunt, T. Imai, and F. C. Chou, 17O NMR study of q = 0 spin excitations in a nearly ideal S = 1 / 2 1D Heisenberg antiferromagnet, Sr2CuO3, up to 800 K, Phys. Rev. Lett, vol.87, p.247202, 2001.

P. Laffez, X. J. Wu, S. Adachi, H. Yamauchi, and N. Môri, Synthesis of superconducting Sr 2 CuO 3+delta using high-pressure techniques, Physica C, vol.222, pp.303-309, 1994.

T. H. Geballe and M. Marezio, Enhanced superconductivity in Sr2CuO4-v, Physica C, vol.469, pp.680-684, 2009.

T. Egami, Local structural anomaly near Tc observed by pulsed neutron-scattering, Physica C, vol.185, pp.867-868, 1991.

M. I. Salkola, A. R. Bishop, J. Mustre-de-leon, and S. A. Trugman, Dynamic polaron tunneling in YBa 2 Cu 3 O 7 : Optical response and inelastic neutron scattering, Phys. Rev. B Condens. Matter, vol.49, pp.3671-3674, 1994.

M. I. Salkola, A. R. Bishop, S. A. Trugman, J. Mustre-de, and L. , Correlation-function analysis of nonlinear and nonadiabatic systems: Polaron tunneling, Phys. Rev. B Condens. Matter, vol.51, pp.8878-8891, 1995.

J. M. Deleon, Signatures of mesoscopic Jahn-Teller polaron inhomogeneities in high-temperature superconductors, J. Phys. Condens. Matter, vol.437, pp.169-175, 1996.

S. D. Conradson, I. D. Raistrick, and A. R. Bishop, Axial oxygen-centered lattice instabilities and high-temperature superconductivity, Science, vol.248, pp.1394-1398, 1990.

C. A. Young, Reverse Monte Carlo study of apical Cu-O bond distortions in YBa2Cu3O6.93, Z. Kristallogr. Cryst. Mater, vol.227, p.280, 2012.

M. Arai, Local structural instability of high-T c oxide superconductors studied by inelastic neutron-scattering, J. Supercond, vol.7, pp.415-418, 1994.

S. D. Conradson, I. Batistic, A. R. Bishop, J. Mustre-de, and L. , Evidence for an axial oxygen-centered lattice fluctuation associated with the superconducting transition in YBa2Cu3O7, Phys. Rev. Lett, vol.65, pp.1675-1678, 1990.

I. Batistic, A. R. Bishop, S. D. Conradson, S. A. Trugman, J. Mustre-de et al., Polaron origin for anharmonicity of the axial oxygen in YBa2Cu3O7, Phys. Rev. Lett, vol.68, pp.3236-3239, 1992.

P. G. Allen, S. D. Conradson, A. R. Bishop, A. R. Bishop, J. Mustre-de et al., Characterization of a split axial-oxygen site in TlBa 2 Ca 3 Cu 4 O 11 by extended x-ray-absorption fine-structure spectroscopy, Phys. Rev. B Condens. Matter, vol.44, pp.9480-9485, 1991.

J. M. Deleon, Planar oxygen-centered lattice instabilities in Tl-based hightemperature superconductors, Physica C, vol.220, pp.377-382, 1994.

S. D. Conradson, Possible demonstration of a polaronic Bose-Einstein(-Mott) condensate in UO 2(+x) by ultrafast THz spectroscopy and microwave dissipation, Sci. Rep, vol.5, p.15278, 2015.

S. D. Conradson, Closure of the Mott gap and formation of a superthermal metal in the Frohlich-type nonequilibrium polaron Bose-Einstein condensate in UO2+x, Phys. Rev. B, vol.96, p.125114, 2017.

G. Fabbris, Combined single crystal polarized XAFS and XRD at high pressure: Probing the interplay between lattice distortions and electronic order at multiple length scales in high T-c cuprates, Res, vol.36, pp.348-359, 2016.

W. A. Dollase, Correction of intensities for preferred orientation in powder diffractometry-Application of the march model, J. Appl. Cryst, vol.19, pp.267-272, 1986.

J. Schlappa, Probing multi-spinon excitations outside of the two-spinon continuum in the antiferromagnetic spin chain cuprate Sr2CuO3, Nat. Commun, vol.9, p.5394, 2018.

S. D. Conradson, I. Batistic, A. R. Bishop, A. R. Bishop, J. Mustre-de et al., Correlation between axial-oxygen anharmonicity and Tc in YBa2Cu3O7 and related compounds, Phys. Rev. B Condens. Matter, vol.44, pp.2422-2425, 1991.

S. D. Conradson, Axial oxygen-centered lattice instabilities in YBa2Cu3O7: An application of the analysis of extended x-ray-absorption fine structure in anharmonic systems, Phys. Rev. B Condens. Matter, vol.45, pp.2447-2457, 1992.

A. Manceau, D. Chateigner, and W. P. Gates, Polarized EXAFS, distance-valence leastsquares modeling (DVLS), and quantitative texture analysis approaches to the structural refinement of Garfield nontronite, Phys. Chem. Miner, vol.25, pp.347-365, 1998.

S. D. Conradson, Nanoscale heterogeneity, premartensitic nucleation, and a new plutonium structure in metastable delta fcc Pu-Ga alloys, Phys. Rev. B Condens. Matter Mater. Phys, vol.89, p.26, 2014.

J. J. Rehr, J. J. Kas, F. D. Vila, M. P. Prange, and K. Jorissen, Parameter-free calculations of X-ray spectra with FEFF9, Phys. Chem. Chem. Phys, vol.12, pp.5503-5513, 2010.

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