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Field-induced uniform antiferromagnetic order associated with superconductivity in Pr$$_{1-x}$$LaCe$$_x$$CuO$$_{4-delta}$$

Kadono, Ryosuke*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Higemoto, Wataru  ; Fujita, Masaki*; Yamada, Kazuyoshi*

A strong correlation between field-induced antiferromagnetic (AF) order and superconductivity is demonstrated for an electron-doped cuprate superconductor, Pr$$_{1-x}$$LaCe$$_x$$CuO$$_{4-delta}$$ (PLCCO). In addition to the specimen with $$x=$$ 0.11 (which is close to the AF phase boundary, $$xsimeq$$ 0.10), we show that the specimen with $$x=$$ 0.15 ($$T_{rm c}simeq$$ 16 K at zero field) also exhibits the field-induced AF order with a reduced magnitude of the induced moment. The uniform muon Knight shift at a low magnetic field ($$sim$$ 10$$^2$$ Oe) indicates that the AF order is not localized within the cores of flux lines, which is in marked contrast to theoretical predictions for hole-doped cuprates. The presence of anomalous nondiagonal hyperfine coupling between muons and Pr ions is also demonstrated in detail.

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Category:Physics, Multidisciplinary

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