Polarized-neutron study of novel magnetic excitations in underdoped high-temperature superconductor YBa2Cu3O6.6
The pseudogap phase in the underdoped part of the phase diagram of high-Tc cuprates continues to challenge condensed-matter physicists. A hidden magnetic order has been identified in the underdoped YBa(2)Cu(3)O(7-d) (YBCO) and HgBa(2)CuO(4+d) (Hg1201) systems. The discovery of unconventional magnetic excitations branches with almost no dispersion in underdoped Hg1201 on ILL instrumentation is the motivation for this proposal. These excitations are observed in the unexpected momentum transfer region around q~0, totally different from conventional spin fluctuations near (pi, pi) and it seems to be related to the magnetic order in the pseudogap phase. We propose to search for the counterpart of these excitations in an underdoped YBCO6.6 sample. Our previous attempt in a large sample (but slighly overdoped) did not evidence strong magnetic modes. Looking for underdoped YBCO6.6 sample is the necessary step in order to show whether these dispersionless modes in Hg1201 are a feature universal to cuprates.
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Bourges; IVANOV Alexandre; KEIMER Bernhard; LI Yuan; LOEW Toshinao; MANGIN-THRO Lucile; PORRAS PEREZ GUERRERO Juan Pablo; SIDIS Yvan and WHEELER Elisa. (2013). Polarized-neutron study of novel magnetic excitations in underdoped high-temperature superconductor YBa2Cu3O6.6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1196
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