Evolution of the superconducting properties in FeSe1-xSx

Article

关键词: VORTEX LINE;    ELECTRONIC-STRUCTURE;    STATES;    IMPURITIES;    DENSITY;    ORDER;    FESE;   

DOI  :  10.1103/PhysRevB.92.235113

来源: SCIE

【 摘 要 】

We present scanning tunneling microscopy and spectroscopy measurements on FeSe1-xSx single crystals with x = 0, 0.04, and 0.09. The S substitution into the Se site is equivalent to a positive chemical pressure, since S and Se have the same valence and S has a smaller ionic radius than Se. The subsequent changes in the electronic structure of FeSe induce a decrease of the structural transition temperature and a small increase in the superconducting critical temperature. The evolution of the gaps with increasing S concentration suggests an increase of the hole Fermi surface. Moreover, the vortex core anisotropy, that likely reflects the Fermi surface anisotropy, is strongly suppressed by the S substitution.

【 授权许可】

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