Publication

Journal	Physical Review B
Volume (Issue)	92
Title of proceedings	Physical Review B

Static spin-stripe order and superconductivity were systematically studied in La2-xBaxCuO4 (0.11 {\leq} x {\leq} 0.17) at ambient pressure by means of magnetization and {\mu}SR experiments. We find that all the investigated La2-xBaxCuO4 samples exhibit static spin-stripe order and that the quasi two-dimensional superconducting (SC) transition temperature T\rm c1 and the static spin-stripe order temperature T\rm so have very similar values throughout the phase diagram. Moreover, the magnetic and the SC properties of the x = 0.155 (LBCO-0.155) and x = 0.17 (LBCO-0.17) samples were studied under hydrostatic pressure. As a remarkable result, in these bulk cuprate superconductors the three-dimensional SC transition temperature T\rm c and T\rm so nearly coincide [T\rm c(p) {\simeq} T\rm so(p)] at all pressure investigated (0 {\leq} p {\leq} 2.3 GPa). We also observed a pressure induced transition from long-range spin stripe order to a disordered magnetic state at p\star {\simeq} 1.6 GPa in LBCO-0.155, coexisting with a SC state with substantial superfluid density. In LBCO-0.17 a disordered magnetic state is present at all p. The present results indicate that static magnetic order and SC pairing correlations develop in a cooperative fashion in La2-xBaxCuO4, and provide a new route of understanding the complex interplay between static magnetism and superconductivity in the stripe phase of cuprates.