高温超导体(La1-xCax)(Ba1.75-xLa0.25 +x)Cu3Oy掺杂效应的43Ca NMR研究

Sébastien Marchand , Arlette Trokiner , Andrey Yakubovskii , Philippe Monod , Arkady Knizhnik , Yakov Eckstein
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引用次数: 2

摘要

在高温超导体(CaxLa1-x)(Ba1.75-xLa0.25 +x)Cu3Oy的正常状态下测量43Ca核磁共振与温度的关系。选择样品是为了比较在欠掺杂状态下改变钙和氧含量的影响。我们确定了四极参数和奈特位移(KS)。测量了材料的宏观磁化率,并用其对43Ca超细场进行了估计。随着钙含量的增加,KS的变化并没有表现出掺杂水平增加的特征,这与宏观性质变化所暗示的相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
43Ca NMR study of the doping effects in the high temperature superconductor (La1–xCax)(Ba1.75–xLa0.25+x)Cu3Oy

The 43Ca nuclear magnetic resonance is measured in the normal state of the high temperature superconductor (CaxLa1–x)(Ba1.75–xLa0.25+x)Cu3Oy as a function of temperature. The samples are chosen in order to compare the effect of changing the calcium and the oxygen contents in the underdoped regime. We determine the quadrupolar parameters and the Knight shift (KS). The macroscopic magnetic susceptibility is measured and used to estimate the 43Ca hyperfine field. The variation of KS when increasing the calcium content does not show the signature of an increase of the doping level, contrary to what is suggested by the variation of macroscopic properties.

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