SPIN-ORBIT SCATTERING IN dx2-y2 SUPERCONDUCTORS Page: 2 of 4
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International Journal of Modern Physics B Vol. 13 Nos. 29, 30 & 31 (1999) 3513-3515
World Scientific Publishing Company
Spin-orbit scattering in dx2_y2 superconductors
M. J. Graf*
Center for Materials Science, Los Alamos National Laboratory
Los Alamos, New Mexico 87545, United States.
and
A. V. Balatsky
Theory Division, Los Alamos National Laboratory
Los Alamos, New Mexico 87545, United States.
and
J. A. Sauls
Department of Physics and Astronomy, Northwestern University
Evanston, Illinois 60208, United States.
Received (July 22, 1999)
Revised (July 22, 1999)
We show that spin-orbit scattering off an isolated magnetic impurity in a singlet dX2_y2
superconductor generates a dxy order parameter with locally broken time-reversal sym-
metry. A consequence of the induced dy component are orbital charge currents and a
magnetic field in the vicinity of the magnetic impurity.
Keywords: Spin-orbit scattering, magnetic impurities, broken time-reversal symmetry,
unconventional superconductors.
The identification of the symmetry of the superconducting state of many of
the high Tc cuprates with a spin-singlet "d-wave" orbital symmetry is widely
accepted'2. This phase preserves time-reversal (T) symmetry, but breaks the re-
flection symmetry along the [110] mirror plane, as well as 2 rotations in a tetragonal
crystal. As a consequence d42_y2 pairing correlations are particularly sensitive to
scattering of quasiparticles on the Fermi surface. We show that an isolated im-
purity in a d,2-y2 superconductor generates a complex dy order parameter (OP)
with locally broken T symmetry; the signature of this effect is an induced orbital
charge current near the impurity and a localized magnetic field in the vicinity of
the impurity.
Recent transport experiments reported evidence for low temperature phases as-
sociated with a secondary OP at surfaces of YBCO3, and in the bulk of Ni-doped
Bi-22124. The latter anomaly was interpreted as the signature of a second supercon-
*email: graf@lanl.gov3513
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GRAF, M. & AL, ET. SPIN-ORBIT SCATTERING IN dx2-y2 SUPERCONDUCTORS, article, April 1, 1999; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc716761/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.