首页> 外文期刊>Journal of Low Temperature Physics >Normal state resistivity of YBa sub(2)Cu sub(3)O sub(7- delta )/PrBa sub(2)Cu sub(2.8)Ga sub(0.2) O sub(7- delta ) c-axis superlattices: Evidence for an underdoping effect of YBa sub(2)Cu sub(3)O sub(7- delta )
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Normal state resistivity of YBa sub(2)Cu sub(3)O sub(7- delta )/PrBa sub(2)Cu sub(2.8)Ga sub(0.2) O sub(7- delta ) c-axis superlattices: Evidence for an underdoping effect of YBa sub(2)Cu sub(3)O sub(7- delta )

机译:YBa sub(2)Cu sub(3)O sub(7- delta)/ PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7- delta)c轴超晶格的常态电阻率:证据YBa sub(2)Cu sub(3)O sub(7- delta)的欠掺杂效应

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We measured the ab-plane resistivity of c-axis YBa sub(2)Cu sub(3)O sub(7- delta ) /PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7) superlattices grown by pulsed laser deposition, from T sub(C) to 325 K. The normal-state resistivity and the fluctuation regime above T sub(C) were studied for different thickness of YBa sub(2)Cu sub(3)O sub(7- delta ) and PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7- delta ) in the superlattice period. As the concentration of PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7- delta ) is raised, the T sub(C) decreases and the resistivity increases. Evidence is given for an underdoping effect in the YBa sub(2)Cu sub(3)O sub(7- delta ) layers and our measurements are compared to similar measurements on oxygen-deficient YBa sub(2)Cu sub(3)O sub(7- delta ) thin films, grown on the same equipment. They are also compared to measurements on YBa sub(2)Cu sub(3-x)Co sub(x)O sub(7- delta ) single crystals made by other groups. We present here the different measurements and investigate the mechanisms that could be held responsible for this depletion in charge carriers.
机译:我们测量了c轴YBa sub(2)Cu sub(3)O sub(7- delta)/ PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7)超晶格的ab面电阻率通过脉冲激光沉积生长,从T sub(C)到325K。研究了不同厚度的YBa sub(2)Cu sub(3)O sub(T)的常态电阻率和在T sub(C)之上的涨落状态。 7-delta)和PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7- delta)在超晶格周期中。随着PrBa sub(2)Cu sub(2.8)Ga sub(0.2)O sub(7-delta)的浓度升高,T sub(C)减小,电阻率增加。给出了YBa sub(2)Cu sub(3)O sub(7-delta)层中掺杂不足的证据,并将我们的测量结果与对氧不足的YBa sub(2)Cu sub(3)O的类似测量结果进行了比较。在同一设备上生长的亚(7-delta)薄膜。它们还与其他小组制作的YBa sub(2)Cu sub(3-x)Co sub(x)O sub(7- delta)单晶的测量结果进行了比较。我们在这里介绍了不同的测量方法,并研究了可能对电荷载流子耗尽负责的机制。

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