Abstract
We report here the magnetic ground state in the hole-doped two-leg ladder system Sr 2.5Ca 11.5Cu 24O 41 at ambient pressure. We clearly observed the singlet ground state, of which values are almost unchanged for the different Ca concentration (∼32 meV). We also observed the antiferromagnetic long-range order below T N, of which values are between ∼0.6 K (x=9) and ∼3.6 K (x=1.36). A possible magnetic structure of this system, was also discussed. These facts can be interpreted in line with scenario that the singlet state and antiferromagnetic order coexist at ambient pressure and these localized hole pairs begin to move under pressure, resulting in the occurrence of superconductivity.
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