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  Tutueanu, A.-E.; Jacobsen, H.; Ray, P.J.; Holm-Dahlin, S.; Lacatusu, M.-E.; Tejsner, T.B.; Grivel, J.-C.; Schmidt, W.; Toft-Petersen, R.; Steffens, P.; Boehm, M.; Wells, B.; Udby, L.; Lefmann, K.; Tranum Rømer, A.: Nature of the magnetic stripes in fully oxygenated La₂CuO_4+y. Physical Review B 103 (2021), p. 045138 /1-15

10.1103/PhysRevB.103.045138
Open Accesn Version

Abstract:
We present triple-axis neutron scattering studies of static and dynamic magnetic stripes in an optimally oxygen-doped cuprate superconductor, La2CuO4+y, which exhibits a clean superconducting transition at Tc=42K. Polarization analysis reveals that the magnetic stripe structure is equally represented along both of the tetragonal crystal axes and that the fluctuating stripes display significant weight for in-plane as well as out-of-plane spin components. Both static magnetic order as well as low-energy fluctuations are fully developed in zero applied magnetic field and the low-energy spin fluctuations at ℏω=0.3–10meV intensify on cooling. We interpret this as an indication that superconductivity and low-energy spin fluctuations coexist microscopically in spatial regions which are separated from domains with static magnetic order.