Drastic effect of impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
| Autor: | Z. Zajicek, S. J. Singh, H. Jones, P. Reiss, M. Bristow, A. Martin, A. Gower, A. McCollam, A. I. Coldea |
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| Rok vydání: | 2022 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Condensed Matter - Materials Science Condensed Matter - Strongly Correlated Electrons Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter::Superconductivity Condensed Matter - Superconductivity Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Correlated Electron Systems |
| Zdroj: | Physical Review B, 105, 11, pp. 1-14 Physical Review B, 105, 1-14 |
| ISSN: | 2469-9950 |
| DOI: | 10.1103/physrevb.105.115130 |
| Popis: | Non-magnetic impurities in iron-based superconductors can provide an important tool to understand the pair symmetry and they can influence significantly the transport and the superconducting behaviour. Here, we present a study of the role of strong impurity potential in the Fe plane, induced by Cu substitution, on the electronic and superconducting properties of single crystals of FeSe. The addition of Cu quickly suppresses both the nematic and superconducting states, and increases the residual resistivity due to enhanced impurity scattering. Using magnetotransport data up to 35 T for a small amount of Cu impurity, we detect a significant reduction in the mobility of the charge carriers by a factor of ~3. While the electronic conduction is strongly disrupted by Cu substitution, we identify additional signatures of anisotropic scattering which manifest in linear resistivity at low temperatures and $H^{1.6}$ dependence of magnetoresistance. The suppression of superconductivity by Cu substitution is consistent with a sign-changing $s_{\pm}$ order parameter. Additionally, in the presence of compressive strain, the superconductivity is enhanced, similar to FeSe. 16 pages, 9 figures, to appear in Physcial Review B (2022) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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