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首页> 外文期刊>Physical review >Effects of Ca substitution and the pseudogap on the magnetic properties of Y_(1-x)Ca_xRa_2Cu_3O_(7-δ)
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Effects of Ca substitution and the pseudogap on the magnetic properties of Y_(1-x)Ca_xRa_2Cu_3O_(7-δ)

机译：Ca替代和拟隙对Y_（1-x）Ca_xRa_2Cu_3O_（7-δ）磁性能的影响

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摘要

The effects of planar hole content, p, on the static magnetic susceptibility, x(T), of Y_(1-x)Ca_xBa_2Cu_3O_(7-δ) polycrystalline samples were investigated over a wide range of Ca(x) and oxygen contents. We have again found that the pseudogap in the quasiparticle spectral weight appears abruptly below a planar hole content p =0.190 ± 0.005. After considering possible effects of magnetic impurity phases, we conclude that nonmagnetic Ca~(2+), in the 3p~6 state, induces a Curie-like contribution to x(T) that increases systematically and nonlinearly with x but is almost independent of p. We argue that this arises from statistical clusters containing two or more nearest-neighbor Ca atoms.
机译：在宽范围的Ca（x）和氧含量范围内，研究了Y_（1-x）Ca_xBa_2Cu_3O_（7-δ）多晶样品中平面孔含量p对静态磁化率x（T）的影响。我们再次发现，在平面孔含量p = 0.190±0.005以下时，准粒子光谱权重中的伪间隙突然出现。在考虑了磁性杂质相的可能影响后，我们得出结论，非磁性Ca〜（2+）在3p〜6态下，对x（T）产生居里样的贡献，随着x的增加系统地且非线性地增加，但几乎独立于p。我们认为这是由包含两个或多个最近邻的Ca原子的统计簇引起的。

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