Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr2CuO4 driven by oxygen nonstoichiometry
Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr2CuO4 driven by oxygen nonstoichiometry
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DOI：
10.1103/physrevb.98.020505
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发表时间：
2018-01
影响因子：
3.7
通讯作者：
M. Horio;Y. Krockenberger;K. Koshiishi;S. Nakata;K. Hagiwara;Masaki Kobayashi;K. Horiba;H. Kumigashira;Hiroshi Irie;Hideki Yamamoto;A. Fujimori
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文献类型：
--
作者：
M. Horio;Y. Krockenberger;K. Koshiishi;S. Nakata;K. Hagiwara;Masaki Kobayashi;K. Horiba;H. Kumigashira;Hiroshi Irie;Hideki Yamamoto;A. Fujimori
具有 ${T}^{\ensuremath{'}}$ 型结构的电子掺杂铜酸盐块体晶体需要 Ce 取代和还原退火才能出现超导性，而仅还原退火就可以在 ${T}^{\ensuremath{'}}$ 型铜酸盐薄膜中诱导超导性。为了揭示导致超导性的低能电子态，我们对超导无Ce ${T}^{\ensuremath{'}}$型铜酸盐${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$薄膜进行了角分辨光电子能谱测量。结果表明，超导${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$的整体能带结构和费米表面积与超导Ce掺杂块状单晶相似，突出了在讨论${T}^{\ensuremath{'}}$型铜酸盐的物理性质时实际电子浓度而不是Ce浓度的重要性。
Bulk crystals of electron-doped cuprates with a ${T}^{\ensuremath{'}}$-type structure require both Ce substitutions and reduction annealing for the emergence of superconductivity while reduction annealing alone can induce superconductivity in thin films of ${T}^{\ensuremath{'}}$-type cuprates. In order to reveal the low-energy electronic states which are responsible for the superconductivity, we have conducted angle-resolved photoemission spectroscopy measurements on thin films of the superconducting Ce-free ${T}^{\ensuremath{'}}$-type cuprate ${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$. The results indicate that the overall band structure and the Fermi surface area of the superconducting ${\mathrm{Pr}}_{2}{\mathrm{CuO}}_{4}$ are similar to those of superconducting Ce-doped bulk single crystals, highlighting the importance of the actual electron concentration rather than the Ce concentration when discussing the physical properties of ${T}^{\ensuremath{'}}$-type cuprates.