Influence of disorder on the signature of the pseudogap and multigap superconducting behavior in FeSe

Sahana Rößler, Chien Lung Huang, Lin Jiao, Cevriye Koz, Ulrich Schwarz, Steffen Wirth

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

We investigated several FeSe single crystals grown by two different methods by utilizing experimental techniques, namely, resistivity, magnetoresistance, specific heat, scanning tunneling microscopy, and spectroscopy. The residual resistivity ratio (RRR) shows systematic differences between samples grown by chemical vapor transport and flux vapor transport, indicating variance in the amount of scattering centers. Although the superconducting transition temperature Tc is not directly related to RRR, our study evidences subtle differences in the features of an incipient ordering mode related to a depletion of density of states at the Fermi level. For instance, the onset temperature of anisotropic spin fluctuations at T∗≈75 K, and the temperature of the opening up of a partial gap in the density of states at T∗∗≈30 K, are not discernible in the samples with lower RRR. Further, we show that the functional dependence of the electronic specific heat below 2 K, which allows us to determine the nodal features as well as the small superconducting gap, differs significantly in crystals grown by these two different methods. Our investigation suggests that some of the controversies about the driving mechanism for the superconducting gap or its structure and symmetry are related to minute differences in the crystals arising due to the growth techniques used and the total amount of scattering centers present in the sample.

原文English
文章編號094503
期刊Physical Review B
97
發行號9
DOIs
出版狀態Published - 2018 三月 8

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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