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Growth and transport properties of CaFeAsF1−x single crystals

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Abstract

Using self-flux method, we have successfully grown the parent phase of the single crystals of CaFeAsF1−x . The X-ray diffraction indicates good crystallinity. In-plane resistivity shows a bad metallic behavior with a sharp drop of resistivity at about T SDW =119 K. This anomaly is associated with the possible spin density wave (SDW) order. Interestingly near T SDW, the resistivity exhibits a cusp-like feature, which may be understood as the strong coupling effect between the electrons and the antiferromagnetic (AF) spin fluctuations. A reduction of fluorine or application of a high pressure will suppress the SDW feature and induce superconductivity. Hall effect measurements reveal a positive Hall coefficient below T SDW indicating a dominant role of the hole-like charge carriers in the parent phase. Strong magnetoresistance has been observed below T SDW suggesting multiple conduction channels of the charge carriers.

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Authors and Affiliations

  1. Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China

    Jian Tao, Sheng Li, XiYu Zhu, Huan Yang & HaiHu Wen

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  1. Jian Tao
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  2. Sheng Li
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  3. XiYu Zhu
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  4. Huan Yang
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  5. HaiHu Wen
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Correspondence to HaiHu Wen.

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Contributed by WEN HaiHu (Associate Editor)

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Tao, J., Li, S., Zhu, X. et al. Growth and transport properties of CaFeAsF1−x single crystals. Sci. China Phys. Mech. Astron. 57, 632–636 (2014). https://doi.org/10.1007/s11433-014-5422-4

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  • DOI: https://doi.org/10.1007/s11433-014-5422-4

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