Time-scale of the intra-unit-cell magnetism in high-Tc cuprates
The phase diagram of high temperature superconductors is dominated by a pseudo-gap phase with highly unusual physical properties. One theory predicted broken time-reversal and inversion symmetry due to ordered loop currents. Polarized neutron scattering experiments have reported the appearance of such magnetic order when entering the PG state in three different cuprate families. However, other magnetic probes such as muons spin resonance (µSR) and nuclear magnetic resonance experiments could not see the static local fields expected for the magnetic order. Recently, nevertheless, a µSR study reports a dynamic relaxation rate in longitudinal applied field in single crystals of YBa2Cu3O6+x. The amplitude of the fluctuating magnetic fields is of the order of the magnitude deduced from polarized neutron diffraction. The magnetic correlations are fluctuating at about 10^8 Hz at low temperature, corresponding to an energy scale varying in the range 0.5-10 µeV. We then aimed to determine the finite time-scale of these magnetic correlations by using high energy resolution backscattering neutron spectroscopy. We asked for 5 days on IN16b to determine the magnetic fluctuations time-scale.
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Bourges; BOUNOUA Dalila; Bernhard Frick; JEONG Jaehong; MANGIN-THRO Lucile and SIDIS Yvan. (2018). Time-scale of the intra-unit-cell magnetism in high-Tc cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-514
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