Gap features of layered iron-selenium-tellurium compound below and above the superconducting transition temperature by break-junction spectroscopy combined with STS

2018 5th Global Conference on Polymer and Composite Materials

材料科学;化学

Ekino, T.^1 ; Sugimoto, A.^1 ; Gabovich, A.M.^2

Hiroshima University, Graduate School of Integrated Arts and Sciences, Higashi-Hiroshima

7398521, Japan^1

Institute of Physics, National Academy of Sciences of Ukraine, Kyiv

03680, Ukraine^2

关键词: Break junctions;    Critical temperatures;    Density waves;    Electronic spectrum;    Gap structures;    High-Tc cuprates;    Scanning tunnelling spectroscopy;    Superconducting gaps;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/369/1/012024/pdf
DOI  :  10.1088/1757-899X/369/1/012024

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We studied correlations between the superconducting gap features of Te-substituted FeSe observed by scanning tunnelling spectroscopy (STS) and break-junction tunnelling spectroscopy (BJTS). At bias voltages outside the superconducting gap-energy range, the broad gap structure exists, which becomes the normal-state gap above the critical temperature, Tc. Such behaviour is consistent with the model of the partially gapped density-wave superconductor involving both superconducting gaps and pseudogaps, which has been applied by us earlier to high-Tccuprates. The similarity suggests that the parent electronic spectrum features should have much in common for these classes of materials.