Probing the local effects of magnetic impurities on superconductivity

Science

Volumn 275, Issue 5307, 1997, Pages 1767-1770

  Yazdani, Ali ^b   Jones, B A ^b   Lutz, C P ^b   Crommie, M F ^a,b   Eigler, D M ^b  

^a Boston University ^*  (United States)

^b IBM ALMADEN RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; ATOM; CONDUCTANCE; ELECTRON; EXCITATION; MAGNETISM; PRIORITY JOURNAL; SCANNING TUNNELING MICROSCOPY;

EID: 0030909823     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5307.1767     Document Type: Article

References (27)

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19. Similar approaches have been used to describe STM measurements near a vortex [(6); J. D. Shore et. al., Phys. Rev. Lett. 62, 3089 (1989); F. Gygi and M. Schluter, Phys. Rev. B 41, 822 (1990)]. For more recent calculations near a vortex, see N. Hayashi, M. Ichioka, K. Machida, Phys. Rev. Lett. 77, 4074 (1996).
20. Similar approaches have been used to describe STM measurements near a vortex [(6); J. D. Shore et. al., Phys. Rev. Lett. 62, 3089 (1989); F. Gygi and M. Schluter, Phys. Rev. B 41, 822 (1990)]. For more recent calculations near a vortex, see N. Hayashi, M. Ichioka, K. Machida, Phys. Rev. Lett. 77, 4074 (1996).
21. We have not made a more detailed comparison of the radial dependence between the measurement and the model calculation. Such a comparison would require us to taken into account the details of the adatom geometry, that is, the fact that at small lateral tip displacements (r < 4 Å), most of the tunneling current is channeled through the impurity site [for example, see N. D. Lang, Phys. Rev. Lett. 56, 1164 (1986)].
22. Our model predicts a local electron-hole asymmetry that oscillates and decays as a function of distance from the impurity. The I = 0 amplitude remains constant, but its contribution decays as a function of r. Gaussian averaging of the model calculation over typical distances averaged by STM causes a non-oscillatory but decaying asymmetry in the region near the impurity.
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24. F, while allowing J to vary by 5%. The bound excitation energy, that is, the peak location in the data, is a very sensitive function of J.
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27. We thank the authors of (17) and (18) for their interest in our experiment and thank D.-H Lee, D. J. Scalapino, and M. Tinkham for fruitful discussions.