Cooperative coupling of static magnetism and bulk superconductivity in the stripe phase of La2−xBaxCuO4: Pressure- and doping-dependent studies
Z. Guguchia, R. Khasanov, A. Shengelaya, E. Pomjakushina, S. J. L. Billinge, A. Amato, E. Morenzoni, H. Keller
DOI 10.1103/PhysRevB.94.214511 · Physical Review B
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Abstract
Static spin-stripe order and superconductivity were systematically studied in La2−xBaxCuO4 (0.11≤x≤0.17) at ambient pressure by means of magnetization and μSR 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 Tc1 and the static spin-stripe order temperature Tso 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 Tc and Tso nearly coincide [Tc(p)≃Tso(p)] at all pressure investigated (0≤p≤2.3 GPa). We also observed a pressure induced transition from long-range spin stripe order to a disordered magnetic state at p☆≃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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | onset |
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure unresolved | unknown |
| La1.875Ba0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | onset |
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