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arXiv 0909.3788cond-mat.supr-con
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脉冲laser法生长LaFeAsOF外延薄膜

Epitaxial LaFeAsOF thin films grown by pulsed laser deposition

M. Kidszun, S. Haindl, E. Reich, J. Haenisch, L. Schultz, B. Holzapfel

摘要:

采用脉冲激光沉积法在(001)取向的LaAlO 3衬底上成功地制备了超导和外延生长的LaFeAsOF薄膜。所制备的薄膜具有单一的面内取向,外延关系为(001)[100]平行于(001)[100],半高宽为1 °。此外,超导转变温度的电阻测量显示具有6.8的高剩余电阻比的Tc 90为25 K。所采用的制备技术,即室温下标准薄膜脉冲激光沉积结合后续的后退火工艺,适合于制备高质量的LaFeAsO 1-xFx薄膜。对于垂直于c轴施加的磁场,评估了76.2 T的高上临界场,并且假设单带超导性,计算出各向异性为3.3。

英文摘要:

Superconducting and epitaxially grown LaFeAsOF thin films were successfully prepared on (001)-oriented LaAlO3 substrates using pulsed laser deposition. The prepared thin films show exclusively a single in-plane orientation with epitaxial relation (001)[100] parallel to (001)[100] and a FWHM value of 1deg. Furthermore, resistive measurement of the superconducting transition temperature revealed a Tc90 of 25K with a high residual resistive ratio of 6.8. The applied preparation technique, standard thin film pulsed laser deposition at room temperature in combination with a subsequent post annealing process, is suitable for fabrication of high quality LaFeAsO1-xFx thin films. A high upper critical field of 76.2 T was evaluated for magnetic fields applied perpendicular to the c-axis and the anisotropy was calculated to be 3.3 assuming single band superconductivity.

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