Physics – Condensed Matter – Superconductivity
Scientific paper
2011-01-10
Comptes Rendus Physique, {\bf 12}, 461, (2011)
Physics
Condensed Matter
Superconductivity
11 figures, review about magnetic order in the pseudogap state of cuprates
Scientific paper
10.1016/j.crhy.2011.04.006
One of the leading issues in high-$\rm T_c$ copper oxide superconductors is the origin of the pseudogap phase in the underdoped regime of their phase diagram. Using polarized neutron diffraction, a novel magnetic order has been identified as an hidden order parameter of the pseudogap as the transition temperature corresponds to what is expected for the pseudogap. The observed magnetic order preserves translational symmetry as predicted for orbital moments in the circulating current theory. Being now reported in three different cuprates familles, it appears as a universal phenomenon whatever the crystal structure (with single CuO$_2$ layer or bilayer per unit cell). To date, it is the first direct evidence of an hidden order parameter characterizing the pseudogap phase of high-$\rm T_c$ cuprates.
Bourges Philippe
Sidis Yvan
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