Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-26
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures; accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.69.174501
It has been proposed that Sr_2RuO_4 exhibits spin triplet superconductivity mediated by ferromagnetic fluctuations. So far neutron scattering experiments have failed to detect any clear evidence of ferromagnetic spin fluctuations but, instead, this type of experiments has been successful in confirming the existence of incommensurate spin fluctuations near q=(1/3 1/3 0). For this reason there have been many efforts to associate the contributions of such incommensurate fluctuations to the mechanism of its superconductivity. Our unpolarized inelastic neutron scattering measurements revealed that these incommensurate spin fluctuations possess c-axis anisotropy with an anisotropic factor \chi''_{c}/\chi''_{a,b} of \sim 2.8. This result is consistent with some theoretical ideas that the incommensurate spin fluctuations with a c-axis anisotropy can be a origin of p-wave superconductivity of this material.
Dai Pengcheng
Kadowaki Hiroaki
Kawano-Furukawa H.
Nagata Takahiro
Urata M.
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