Magnetic Properties of Nd_<2-x>Ce_xCuO_<4-y>Studied by Doped Gd^<3+>-EPR
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概要
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Magnetic properties of supercoutducting and nonsuperconducting Nd. .Ce.Cub. . are studied by observing EPR signal of doped Gd" ions which are embeddedNd ' I ' d" " h11b*111 -magnetuc attuce. G ' -EPR lnnewudt changes drastuca y below a out 80 K 111the compound with .X'=0. This change decreases with increase of Ce-concentrationand disappears in the superconducting compounds. The drastic change of the EPRlinewidlh corresponds to Cu" spin reorientation detected by neutron scattering experiments. These results indicate that Ce-doping and furthermore, oxygen reductionlead to disappearance of magnetic moment on Cu ions and in such substances superconductivity is observed. On the other hand, with increasing Ce-concentration, theresonance field increases while the linewidth decreases. This result is discussed on thebasis of variation of dipolar and exchange fields.In-type superconductor, electron spin resonance, magnetic properties, reducing ll effectl
- 社団法人日本物理学会の論文
- 1991-11-15
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