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We report muon spin rotation and magnetic susceptibility experiments onin-plane stress effects on the static spin-stripe order and superconductivityin the cuprate system La2-xBaxCuO4 with x = 0.115. An extremely low uniaxialstress of 0.1 GPa induces a substantial decrease in the magnetic volumefraction and a dramatic rise in the onset of 3D superconductivity, from 10 to32 K; however, the onset of at-least-2D superconductivity is much lesssensitive to stress. These results show not only that large-volume-fractionspin-stripe order is anti-correlated with 3D superconducting (SC) coherence,but also that these states are energetically very finely balanced. Moreover,the onset temperatures of 3D superconductivity and spin-stripe order are verysimilar in the large stress regime. These results strongly suggest a similarpairing mechanism for spin-stripe order, the spatially-modulated 2D and uniform3D SC orders, imposing an important constraint on theoretical models.

Using uniaxial stress to probe the relationship between competing superconducting states in a cuprate with spin-stripe order