Spin stability, anisotropy and superconductivity in strontium ruthenate
Samed Halilov, Naval Research Laboratory
Non-relativistic frozen spin wave calculations reveal the presence
of incommensurate spin-density waves in the ground state of
Sr2RuO4
caused by nesting of the essentially two-dimensional Fermi surface.
Magneto-crystalline anisotropy is estimated to be
vanishingly small in spite of the layered structure of the system. On
account of the immaterial anisotropy, it is speculated
that quantum phason-type excitations can destroy the staggered
magnetization in this highly two-dimensional system. It is also conjectured
that a reduction of local symmetry upon partial replacement of Ru with
Ti leads to substantial stabilization of spin topological superstructure
and
increase of the anisotropy. The paramagnetic phasons are suggested as a
vague assessment for the lower part of excitation spectrum in
the superconducting phase of the undoped system.
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