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Symmetry-unprotected nodes or gap minima in the s++ state of monocrystalline FeSe

机译：单晶FeSe的s ++状态下对称性未受保护的节点或缝隙最小值

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摘要

We report a study on the superconducting pairing mechanism of FeSe via the pair-breaking effects induced by H~+ irradiation combined with low-temperature specific heat measurements. A multigap structure with nodes or gap minima is suggested in a clean FeSe by the specific heat results. The suppression of critical temperature T_c with increasing the defect density manifests a two-step behavior. When the increase in the residual resistivity is small, ∆_(p0)≲ 4.5 μΩ cm, T_c is gradually suppressed with increasing the density of the scattering centers, suggesting the presence of symmetty-unprotected nodes or gap minima. However, for ∆_(p0)≲ 4.5 μΩ cm, T_c is almost independent of the scattering, which indicates that the nodes or gap minima are lifted and the order parameter becomes almost isotropic without a sign change. Thus, the superconductivity in FeSe is found to be realized in a symmetry-unprotected nodal or highly anisotropic s++ state.
机译：我们通过H〜+辐射诱导的成对破坏作用结合低温比热测量报告了FeSe的超导配对机理的研究。根据比热结果，建议在干净的FeSe中采用具有节点或最小间隙的多间隙结构。随着缺陷密度的增加对临界温度T_c的抑制表现出两步行为。当残余电阻率的增加很小时，Δ_（p0）≲4.5μΩcm，随着散射中心密度的增加，T_c逐渐被抑制，这表明存在不受对称保护的节点或最小间隙。但是，对于Δ_（p0）≲4.5μΩcm，T_c几乎与散射无关，这表明节点或间隙最小值被提升，阶数参数几乎变为各向同性，而没有符号变化。因此，发现FeSe中的超导电性是在不受对称保护的节点或高度各向异性的s ++状态下实现的。

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  • 来源
    《Physical review》 |2017年第14期|140505.1-140505.5|共5页
  • 作者

    Yue Sun; Akiyoshi Park; Sunseng Pyoh; Tsuyrishi Tamegai; Hisashi Kitamura;

  • 作者单位

    Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan ,Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology,Chiba 263-8555, Japan;

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