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Low temperature specific heat of 12442-type KCa2Fe4As4F2 single crystals

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Abstract

Low-temperature specific heat (SH) is measured for the 12442-type KCa2Fe4As4F2 single crystal under different magnetic fields. A clear SH jump with the height of \(\Delta C/T|_{T_c}\) = 130 mJ moL−1 K−2 is observed at the superconducting transition temperature Tc. It is found that the electronic SH coefficient ∆γ(H) quickly increases when the field is in the low-field region below 3 T and then considerably slows down the increase with a further increase in the field, which indicates a rather strong anisotropy or multi-gap feature with a small minimum in the superconducting gap(s). The temperature-dependent SH data indicate the presence of the T2 term, which supplies further information and supports the picture with a line-nodal gap structure. Moreover, the onset point of the SH transition remains almost unchanged under the field as high as 9 T, which is similar to that observed in cuprates, and places this system in the middle between the BCS limit and the Bose-Einstein condensation.

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Authors and Affiliations

  1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China

    Teng Wang, JiaNan Chu, JiaXin Feng, LingLing Wang, XiaoSong Liu & Gang Mu

  2. CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai, 200050, China

    Teng Wang, JiaNan Chu, JiaXin Feng, XiaoSong Liu & Gang Mu

  3. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China

    Teng Wang, XuGuang Xu & XiaoSong Liu

  4. University of Chinese Academy of Sciences, Beijing, 100049, China

    JiaNan Chu, JiaXin Feng & Gang Mu

  5. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, 200433, China

    Wei Li

  6. Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China

    HaiHu Wen

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

    HaiHu Wen

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  1. Teng Wang
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Correspondence to Wei Li or Gang Mu.

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Wang, T., Chu, J., Feng, J. et al. Low temperature specific heat of 12442-type KCa2Fe4As4F2 single crystals. Sci. China Phys. Mech. Astron. 63, 297412 (2020). https://doi.org/10.1007/s11433-020-1549-9

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  • DOI: https://doi.org/10.1007/s11433-020-1549-9

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