Local effect of magnetic impurities on superconductivity in Co{sub x}NbSe{sub 2} and Mn{sub x}NbSe{sub 2} single crystals.
Journal Article
·
· J. Phys. : Cond. Matt.
We investigate the effect of individual atomic impurities on the superconducting state that they are embedded in. Using low temperature scanning tunneling microscopy and spectroscopy we could identify Co and Mn atoms in the Co{sub x}NbSe{sub 2} and Mn{sub x}NbSe{sub 2} single crystals and observe the influence on the local electronic density of states (LDOS) at 0.4 K. We find that Co is in the weak scattering limit. In this case the LDOS is quite homogeneous on the sample surface, despite the number of defects, and retains sharp coherent superconducting peaks. This is in strong contrast to the effects of Mn impurities, which locally destroy superconductivity. In this case the LDOS shows a strong enhancement of spectral weight inside the superconducting gap even far from the Mn atoms. Moreover, two impurity bound states are found within the superconducting gap at E/{Delta}{sub 0} = 0.18 and 0.36 at locations close to defects.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; International Frontier Center for Advanced Materials - Japan
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 971172
- Report Number(s):
- ANL/MSD/JA-65639
- Journal Information:
- J. Phys. : Cond. Matt., Journal Name: J. Phys. : Cond. Matt. Journal Issue: 2010 Vol. 22; ISSN 0953-8984; ISSN JCOMEL
- Country of Publication:
- United States
- Language:
- ENGLISH
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