Nature of the magnetic stripes in fully oxygenated La2CuO4+y

Ana Elena Ţuţueanu, Henrik Jacobsen, Pia Jensen Ray, Sonja Holm-Dahlin, Monica Elisabeta Lǎcǎtuşu, Tim Birger Tejsner, Jean Claude Grivel, Wolfgang Schmidt, Rasmus Toft-Petersen, Paul Steffens, Martin Boehm, Barrett Wells, Linda Udby, Kim Lefmann, Astrid Tranum Rømer

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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 ω=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.

Original languageEnglish
Article number045138
JournalPhysical Review B
Issue number4
Publication statusPublished - 2021


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