Superconductivity phase diagrams for the electron-doped cuprates R2-xCexCuO4 (R=La, Pr, Nd, Sm, and Eu)
Superconductivity phase diagrams for the electron-doped cuprates R2-xCexCuO4 (R=La, Pr, Nd, Sm, and Eu)
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DOI：
10.1103/physrevb.77.060505
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发表时间：
2008-02-01
影响因子：
3.7
通讯作者：
Alff, L.
中科院分区：
文献类型：
--
作者：
Krockenberger, Y.;Kurian, J.;Alff, L.
测定了反应分子束外延生长的连续系列外延薄膜中电子掺杂的R(2-x)Ce(X)CuO(4)(其中R=La、Pr、Nd、Sm和Eu)的超导相图。外延薄膜的使用允许材料在远离热力学平衡的情况下生长，扩展了可获得的相空间，超出了块体材料的可用范围。超导相空间随稀土离子尺寸的增大而系统增大。La(2)(-)(X)Ce(X)CuO(4)的掺杂浓度与La(2)(-)(X)Sr(X)CuO(4)(x类似于0.15)相比向低掺杂(x类似于0.09)方向移动。同时，超导区的宽度也变宽了。
The superconductivity phase diagrams of electron-doped cuprates of the form R(2-x)Ce(x)CuO(4) (with R=La, Pr, Nd, Sm, and Eu) have been determined for cerium compositions 0 < x < 0.36 in a consistent series of epitaxial thin films grown by reactive molecular beam epitaxy. The use of epitaxial thin films allows the growth of materials away from thermodynamical equilibrium expanding the accessible phase space beyond the availability of bulk material. The superconducting phase space systematically increases with the rare-earth ionic size. The doping concentration where the maximal transition temperature occurs in La(2) (-) (x)Ce(x)CuO(4) is considerably shifted to lower doping (x similar to 0.09) compared to La(2) (-) (x)Sr(x)CuO(4) (x similar to 0.15). At the same time, the width of the superconducting region is broadened.