Inelastic neutron scattering study of the magnetic fluctuations in Sr2RuO4

Knight Shift and Leading Superconducting Instability from Spin Fluctuations in Sr2RuO4

“…1(a) which originates from interband nesting between the xy orbital and the xz/yz bands has been reported by neutron scattering only in Ref. [29], interpreted as a ridge of the Q 1 peak with weaker intensity.…”

Spin Density Wave Fluctuations andp-Wave Pairing inSr2RuO4

“…But a rough estimation yields J ex ≪ J H , since t ⊥ is only about 0.026 eV [2]. Combining the above two effects for the parallel chains, the spin fluctuation response at (2k F , π) should be much weaker than that at (2k F , 2k F ), as observed in the experiment [13].…”

“…A closely related and competing phenomenon in Sr 2 RuO 4 is the strong spin density wave (SDW) fluctuations at an incommensurate nesting wavevector spanning the Fermi surfaces of the 4/3 filled (α, β) bands [11]. SDW fluctuations at this wavevector Q = (2π/3, 2π/3) [12] were recently reported at room temperature and at energies as high as 80 meV [13]. The SDW peaks at Q which combine nesting in both nearly 1D Fermi surfaces, grow as the temperature (T ) is reduced and saturate at the crossover to 3D Fermi liquid behavior at T 3D ≈ 60 K [11] when the resistivity starts to show a T 2 behavior [14].…”

Spin fluctuations in the exotic metallic state ofSr2RuO4studied withβ-NMR

“…NMR has played a key role in elucidating the magnetic properties of both the normal [8][9][10][11] and superconducting states [12]. Initial interpretation of the NMR emphasized a q = 0 ferromagnetic (FM) response [13,14], but subsequent inelastic neutron scattering (INS) showed a much more substantial antiferromagnetic (AFM) contribution at four incommensurate in-plane wave vectors q 0 = (±0.3, ± 0.3) [15,16] due to Fermi surface nesting of the α and β sheets in the band structure. The dynamic susceptibility χ (q,ω) determined from INS admitted a quantitative model of the NMR spin-lattice relaxation rate (SLR) 1/T 1 via the Moriya relation [15],…”

“…(1) and the AFM χ from INS to calculate 1/T 1 for 8 Li + using γ N = 6.301 MHz/T for 8 Li + . From INS [15,16] the dynamic susceptibility is peaked at q 0 and in energy is well described by a Lorentzian,…”