Field dependence of spin excitations in superoxygenated LCO+O
The mechanism responsible for high-temperature superconductivity (SC) in cuprates is still under intense debate. The incommensurate antiferromagnetic order (IC AFM) and excitations which can be observed by neutron scattering seem to be connected to superconductivity. One consequence of this interplay is the opening of a spin gap at the superconducting transition temperature, an effect observed in YBa2Cu3O6+x and La2-xSrxCuO4. Applying a magnetic field is usually found to enhance the static order, as well inducing in-gap states. In a recent experiment on oxygen-doped La2CuO4+y we found that the magnetic field seems to have the opposite effect, i.e. it removes low-lying states. However, we need to measure more energy transfers with better statistics to obtain publication quality evidence for these unusual results. This experiment will serve an important task in order to understand the fundamental influence of superoxygenation on the magnetic phase both in LCO+O itself but also as a basis for understanding the Sr/O co-doped system and its electronic phase separation
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Henrik Jacobsen; BOEHM Martin; Sonja Holm-Dahlin; LEFMANN Kim; TEJSNER Tim Birger; TUTUEANU Ana Elena and UDBY Linda. (2016). Field dependence of spin excitations in superoxygenated LCO+O. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-471
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