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Bulk charge stripe order competing with superconductivity in La2-xSrxCuO4 (x=0.12)
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We present a volume-sensitive high-energy x-ray diffraction study of the underdoped cuprate high temperature superconductor La2-xSrxCuO4 (x = 0.12, Tc=27 K) in applied magnetic field. Bulk short-range charge stripe order with propagation vector q_ch = (0.231, 0, 0.5) is demonstrated to exist below T_ch = 85(10) K and shown to compete with superconductivity. We argue that bulk charge ordering arises from fluctuating stripes that become pinned near boundaries between orthorhombic twin domains.
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Anomalous Dispersion of LO Phonons in Oxygen-Doped La$_{2-x}$Sr$_{x}$CuO$_{4+\delta}$
The Cu-O bond-stretching phonon anomaly previously seen in Sr-doped LSCO also appears in oxygen-doped La2CuO4+δ and co-doped LSCO6+O, is insensitive to a 10 T field, and points to dynamic charge stripe fluctuations.
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