Search for orbital magnetic fluctuations in YBa2Cu3O7
In unconventional superconductors such as cuprates, the mechanism leading to high-temperature superconductivity has been challenging to understand. Although numerous physicists have concluded that quantum criticality of pseudo-gap phase plays a role in mediating the pairing glue, there is a longstanding disagreement on the real order parameter: either the antiferromagnetic order or another novel magnetic order, such as loop currents. Using polarized neutron diffraction, we have established an intra-unit-cell magnetic order in four different cuprate families. The associated magnetic fluctuations would be, according to the theory, directly related to the mechanism for the high-temperature superconductivity. In slightly overdoped YBa2Cu3O7, a ridge of orbital magnetic fluctuations is expected at low energy. We already have evidenced a peak in H-scan at 3 meV in this composition, using unpolarized neutrons. We here propose polarized inelastic neutron measurements to prove if the peak corresponds to the orbital magnetic fluctuations, and to follow it to higher energy. We request 10 days on IN12. IN12 is suited to achieve the best compromise of high flux and low background.
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JEONG Jaehong; BOEHM Martin; BOUNOUA Dalila; Bourges; MANGIN-THRO Lucile; SIDIS Yvan and STEFFENS Paul. (2018). Search for orbital magnetic fluctuations in YBa2Cu3O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-513
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