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arXiv 0908.1316cond-mat.supr-con
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脉冲Laser沉积FeSe $_{1-x}$ Te $_{x}$薄膜的超导电性

Superconductivity of FeSe$_{1-x}$Te$_{x}$ Thin Films Grown by Pulsed Laser Deposition

Yoshinori Imai, Ryo Tanaka, Takanori Akiike, Masafumi Hanawa, Ichiro Tsukada, Atsutaka Maeda

摘要:

采用脉冲激光沉积法,以FeSe $_{1-x}$ Te $_{x+d}$为多晶靶,在MgO(100)和LaSrAlO $_{4}$(001)衬底上成功地生长了PbO型结构的FeSe $_{1-x}$ Te $_{x}$薄膜。沉积在MgO衬底上的膜(膜厚度$\sim$ 63 nm)在6.7 K(起始)和5.5 K(零电阻率)下显示出超导性。另一方面,沉积在LaSrAlO $_{4}$衬底上的膜(膜厚度$\sim$ 52 nm)仅在2.6 K下表现出超导转变的开始,但没有表现出零电阻率。这表明外延应变对FeSe $_{1-x}$ Te $_{x}$薄膜的超导性能有很大的影响。

英文摘要:

FeSe$_{1-x}$Te$_{x}$ thin films with PbO-type structure are successfully grown on MgO(100) and LaSrAlO$_{4}$(001) substrates from FeSe$_{1-x}$Te$_{x+d}$ polycrystalline targets by pulsed-laser deposition. The film deposited on the MgO substrate (film thickness $\sim$ 63 nm) shows superconductivity at 6.7 K (onset) and 5.5 K (zero resistivity). On the other hand, the film deposited on the LaSrAlO$_{4}$ substrate (film thickness $\sim$ 52 nm) exhibits only the onset of superconducting transition at 2.6 K, but does not show zero resistivity. This indicates the strong influence of epitaxial strain to superconducting properties of FeSe$_{1-x}$Te$_{x}$ thin films.

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