Search for orbital magnetic fluctuations in YBa2Cu3O7
The mechanism leading high-temperature superconductivity (HTS) is challenging to explain. Although the quantum criticality of some magnetic orders is thought to play a role in cuprates, there is a longstanding debate about the origin of the ordered phase competing with superconductivity. Using polarized neutron diffraction, we have established an intra-unit-cell magnetic order in cuprate families, which can be described by a loop-current order proposed by C. M. Varma. The theory provides a novel mechanism for HTS related to the fluctuation of the observed order parameter. Therefore, we here propose to search for the orbital magnetic excitations in optimally doped YBa2Cu3O6.95 in the normal state above Tc. We consider that thermal neutron triple-axis IN20 with CryoPAD polarization analysis is the most relevant to achieve our goal and request 10 days of beam time.
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JEONG Jaehong; Bourges; ENDERLE Mechthild; MANGIN-THRO Lucile and SIDIS Yvan. (2016). Search for orbital magnetic fluctuations in YBa2Cu3O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-474
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