Tunneling Measurements of Electron Spin Effects in Superconductors
Recent tunneling experiments have clarified the role of electron-spin effects in superconductors. Superconductor—normal metal tunneling experiments have shown that the quasi-particle states in Al are spin-split in a magnetic field, and that in Al the BCS assumption of opposite spin pairing is very nearly exact. The predictions of Sarma, Maki, Fulde, and others concerning a paramagnetically limited superconductor have been verified. Superconductor—superconductor tunneling has proved to be a sensitive measure of spin—orbit scattering, as predicted by Fulde and Engler, who have calculated the density of states for each spin direction for finite spin—orbit scattering. Superconducting—ferromagnetic tunneling has been used to measure the apparent spin density of states of ferromagnetic metals and in addition should allow the determination of the density of states of the superconductor for each spin direction even in the presence of spin—orbit scattering.
KeywordsSpin Direction Knight Shift Ferromagnetic Metal Tunneling Conductance Free Energy Curve
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- 7.A. A. Abrikosov and L. P. Gor’kov, Zh. Eksperim. i Teor. Fiz. 42, 1088 (1962)Google Scholar
- A. A. Abrikosov and L. P. Gor’kov, Soviet Phys.—JETP 15, 752 (1962).Google Scholar
- 16.A. L. Fetter and P. C. Hohenberg, in Superconductivity, R. Parks, ed. ( Marcel Dekker, New York, 1969 ), p. 883.Google Scholar
- 22.H. Engler and P. Fulde (to be published).Google Scholar
- 25.P. M. Tedrow and R Meservey, this volume.Google Scholar