Abstract
Zero-field μSR measurements have been performed on Zn-free and Zn-substituted samples of La 2− x Sr x CuO 4 (LSCO) and La 2− x Ba x CuO 4 (LBCO) over a wide doping range. In LSCO and LBCO, around x∼ 1 8 , superconductivity is suppressed in the same doping range where magnetic order appears, suggesting that superconductivity competes with the magnetic order. Zn substitution induces or enhances the magnetic order for LSCO, but depresses the magnetic order for LBCO. The difference is attributed to the existence of stable static magnetic correlations in LBCO. In the doping range around x∼ 1 8 , the magnetic ordering temperature is almost independent of the doping, which indicates segregation of the spin and hole regions. The constant internal magnetic field observed around x∼ 1 8 is much smaller than that for La 2CuO 4, suggesting that the magnetic order around x∼ 1 8 is essentially different from the three-dimensional antiferromagnetic order in La 2CuO 4. The estimated magnetic volume fraction reaches 100% even in the superconducting region.
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