Orbital-singlet pairing and order parameter symmetry in Sr2RuO4
Abstract
Based on the degeneracy of the dzx and dyz orbitals in Sr2RuO4 it is argued that the Cooper pairs condense in orbital singlets. Together with the spin-triplet wave functions the real-space wave function then is symmetric. Considering interaction effects the order parameter is found to have A1g symmetry consistent with a number of experimental observations. The sensitivity of the material on non-magnetic impurities follows in a straightforward manner from the orbital-singlet configuration.
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