Abstract
LSDA non-relativistic frozen spin wave calculations reveal the presence of a non-uniform spin configuration in the ground state of Sr2RuO4, characterized by a non-vanishing local spin moment on Ru hosts. This is related to nesting of the essentially two-dimensional Fermi surface. Spin instability at nesting vectors is manifested as a spin-density wave in the LSDA. By including the spin-orbit coupling, the magneto-crystalline anisotropy is estimated to be vanishingly small in spite of the layered structure of the system. On account of the small anisotropy, it is speculated that the zero-point fluctuations can destroy the staggered magnetization in this highly two-dimensional system. The static paramagnetic susceptibility is found to be slightly anisotropic dominating within tetragonal basal plane. The paramagnons intrinsically featured with phasons can tentatively be considered as a vague assessment for the lower part of excitation spectrum. As possible mediators for the superconductivity, the phasons reflect a specific symmetry of the ground state spinor: on an atomic scale the spinor symmetry is triplet, but on the scale of the helix the symmetry is a singlet. The obtained LDA results show the pure system is on the borderline between paramagnetism and non-uniform incommensurate antiferromagnetic instability.
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Halilov, S.V., Singh, D.J., Perlov, A.Y. (2004). Spin Stability and Low-Lying Excitations in Sr2RuO4 . In: Halilov, S. (eds) Physics of Spin in Solids: Materials, Methods and Applications. NATO Science Series II: Mathematics, Physics and Chemistry, vol 156. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2708-7_15
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DOI: https://doi.org/10.1007/1-4020-2708-7_15
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