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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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