Investigation of the static magnetic stripes under uniaxial pressure in LBCO in the enhanced Tc -regime
There is a large current interest in the relation between disorder and Tc in cuprate superconductors. It is proposed that Tc enhancements can be generated by distortion of the orthogonal stripes in LBCO (La2-xBaxCuO4), re-establishing the Josephson coupling between the layers and hence its 3D superconductivity. A recent study on LBCO (x = 0.115) showed a very large increase in 3D Tc by applying a uniaxial stress of 0.1 GPa in the Cu-O plane. We propose a detailed analysis of the static stripes as a function of temperature and pressure on our LBCO single crystals (x = 0.095 and 0.11). With the high flux of the cold neutron triple-axis spectrometer Thales, we hypothesize that changes in elastic scattering could well be observed. With our custom-build pressure cell, suitable for uniaxial pressures up to 1 GPa, we apply a pressure along the tetragonal [1 1 0] direction, previously shown to be the optimal direction to improve Tc in a related system. This allows for simultaneously probing the (±¿ 1±¿ 0) spin order peaks. We expect to observe a reduction in the elastic signal as a function of pressure, directly proving the hypothesis of a trade-off between the spin density wave and Tc.
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Machteld E. Kamminga; BOEHM Martin; DEEN Pascale Petronella; KRIGHAAR Kristine; LEFMANN Kim and Lise Ørduk Sandberg. (2021). Investigation of the static magnetic stripes under uniaxial pressure in LBCO in the enhanced Tc -regime. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1159
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