Physical Review A, volume 135, issue 3A, pages A550-A563

Superconductivity in a Strong Spin-Exchange Field

Publication typeJournal Article
Publication date1964-08-03
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor2.9
ISSN24699926, 24699934, 0031899X, 10502947, 10941622
General Physics and Astronomy
Abstract
A strong exchange field, such as produced by ferromagnetically aligned impurities in a metal, will tend to polarize the conduction electron spins. If the metal is a superconductor, this will happen only if the spin-exchange field is sufficiently strong compared to the energy gap. When the field is strong enough to break many electron pairs, the self-consistent gap equation is modified and a new type of depaired superconducting ground state occurs. In the idealization of a spatially uniform exchange field with no scattering, it is found that the depaired state has a spatially dependent complex Gorkov field, corresponding to a nonzero pairing momentum in the BCS model. The presence of the "normal" electrons from the broken pairs reduces the total current to zero, gives the depaired state some spin polarization, and results in almost normal Sommerfeld specific heat and single-electron tunneling characteristics. The nonzero value of the pairing momentum also gives rise to an unusual anisotropic electrodynamic behavior of the superconductor, as well as to a degenerate ground state and low-lying collective excitations, in accordance with Goldstone's theorem. The effects of scattering in an actual superconducting ferromagnetic alloy have not been studied and may interfere with experimental investigation of the theoretical results found in this paper for the idealized model.

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FULDE P., Ferrell R. A. Superconductivity in a Strong Spin-Exchange Field // Physical Review A. 1964. Vol. 135. No. 3A. p. A550-A563.
GOST all authors (up to 50) Copy
FULDE P., Ferrell R. A. Superconductivity in a Strong Spin-Exchange Field // Physical Review A. 1964. Vol. 135. No. 3A. p. A550-A563.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1103/PhysRev.135.A550
UR - https://doi.org/10.1103/PhysRev.135.A550
TI - Superconductivity in a Strong Spin-Exchange Field
T2 - Physical Review A
AU - FULDE, PETER
AU - Ferrell, Richard A.
PY - 1964
DA - 1964/08/03
PB - American Physical Society (APS)
SP - A550-A563
IS - 3A
VL - 135
SN - 2469-9926
SN - 2469-9934
SN - 0031-899X
SN - 1050-2947
SN - 1094-1622
ER -
BibTex |
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BibTex Copy
@article{1964_FULDE,
author = {PETER FULDE and Richard A. Ferrell},
title = {Superconductivity in a Strong Spin-Exchange Field},
journal = {Physical Review A},
year = {1964},
volume = {135},
publisher = {American Physical Society (APS)},
month = {aug},
url = {https://doi.org/10.1103/PhysRev.135.A550},
number = {3A},
pages = {A550--A563},
doi = {10.1103/PhysRev.135.A550}
}
MLA
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MLA Copy
FULDE, PETER, and Richard A. Ferrell. “Superconductivity in a Strong Spin-Exchange Field.” Physical Review A, vol. 135, no. 3A, Aug. 1964, pp. A550-A563. https://doi.org/10.1103/PhysRev.135.A550.
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