Shortening of the correlation lengths and critical scattering in high-Tc cuprates
The phase diagram of high-Tc superconductors is dominated by the mysterious pseudo-gap (PG) phase out of which the superconducting state emerges. Recent ultrasound measurements have shown that the PG phase is a broken-symmetry state, whose order parameter remains to be unambiguously determined. Polarized neutron measurements in four different cuprate families, including YBa2Cu3O6+d, have revealed the existence of an intra-unit-cell magnetic order, associated with the PG state. Our recent experiment on D7 allowed us to get a deeper insight on the intrinsic nature of this magnetic phase, through a better characterization of correlation lengths and critical scattering. This study was carried out on a nearly optimally doped YBa2Cu3O6.85 sample. We would like now to follow the evolution of our observations for various hole doping levels using the underdoped YBa2Cu3O6.6 and the weakly overdoped YBa2Cu3O7.
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MANGIN-THRO Lucile; Bourges; SIDIS Yvan and WILDES Andrew. (2015). Shortening of the correlation lengths and critical scattering in high-Tc cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-251
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