Analysis of the charge transfer mechanism on ( Ba 1 − x Nd x CuO 2 + δ ) 2 / ( CaCuO 2 ) n superconducting superlattices by thermoelectric power measurements
Analysis of the charge transfer mechanism on ( Ba 1 − x Nd x CuO 2 + δ ) 2 / ( CaCuO 2 ) n superconducting superlattices by thermoelectric power measurements
复制标题
通过热电势测量分析 ( Ba 1 − x Nd x CuO 2 + δ ) 2 / (CaCuO 2 ) n 超导超晶格的电荷转移机制
DOI：
10.1103/physrevb.69.134511
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发表时间：
2004
影响因子：
3.7
通讯作者：
G. Balestrino
中科院分区：
文献类型：
--
作者：
M.Putti;D.Marre';I.Pallecchi;P. Medaglia;A. Tebano;G. Balestrino
我们利用塞贝克效应研究了人工超晶格中的电荷转移机制。这种技术允许精确地确定在每个${\ mathm {CuO}}_{2}$平面上转移的电荷量。在$({\ mathm {BaCuO}}_{2+\ensuremath{\delta}}{)}_{2}/({\ mathm {cacao}}_{2}{)}_{n}$和$({\ mathm {Ba}} {0.9}{\ mathm {Nd}} {0.1}{\ mathm {CuO}} {2+\ensuremath{\delta}}})}_{2}/({\ mathm {cacao}}_{2}{)}}{n}$超晶格中热电功率的系统表征表明，电荷均匀分布在Ca块中的${\ mathm {CuO}}}_{2}$平面上。在掺钕和未掺钕的超晶格中观察到的塞贝克效应行为的差异归因于两种情况下Ba块的不同金属性质。最后，通过分析指出了$n=1$的超晶格中结构无序的特殊作用。
We have investigated the charge transfer mechanism in artificial superlattices by Seebeck effect measurements. Such a technique allows a precise determination of the amount of charge transferred on each ${\mathrm{CuO}}_{2}$ plane. A systematic characterization of thermoelectric power in $({\mathrm{BaCuO}}_{2+\ensuremath{\delta}}{)}_{2}/({\mathrm{CaCuO}}_{2}{)}_{n}$ and $({\mathrm{Ba}}_{0.9}{\mathrm{Nd}}_{0.1}{\mathrm{CuO}}_{2+\ensuremath{\delta}}{)}_{2}/({\mathrm{CaCuO}}_{2}{)}_{n}$ superlattices demonstrates that electrical charge distributes uniformly among the ${\mathrm{CuO}}_{2}$ planes in the Ca block. The differences observed in the Seebeck effect behavior between the Nd-doped and undoped superlattices are ascribed to the different metallic character of the Ba block in the two cases. Finally, the special role of structural disorder in superlattices with $n=1$ is pointed out by such analysis.