Spin-Orbit Scattering and Pair Breaking in a Structurally Disordred Copper-Oxide Layer

Details Spin-Orbit Scattering and Pair Breaking in a Structurally Disordred Copper-Oxide Layer Spin-Orbit Scattering and Pair Breaking in a Structurally Disordred Copper-Oxide Layer

1993-01-06

arxiv.org/abs/cond-mat/9301003v2

Physics

Condensed Matter

11 pages, RevTex, 3 PostScript figures

Scientific paper

10.1103/PhysRevB.47.9144

To leading order in displacement size, the scattering of electrons in a Cu-O plane from O displacements perpendicular to that plane is due to spin-orbit coupling. This scattering is investigated with the following results: (1) As a consequence of time-reversal symmetry, spin fluctuations, which can strongly enhance scattering from a spin impurity, do not enhance spin-orbit scattering; and (2) for a superconductor with a $d_{x^2-y^2}$ gap function, pair-breaking from spin-orbit scattering can be strong, particularly in a structurally disordered phase in which locally CuO$_6$ octahedra tilt as in the orthorhombic phase of La$_2$CuO$_4$, but globally the average structure is tetragonal. These results are discussed in the context of the (La,Nd)-(Sr,Ba)-Cu-O system where certain structural transitions are observed to suppress superconductivity.

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