Kunkemöller S, Steffens P, Link P, Sidis Y, Mao Z Q, Maeno Y, Braden M
II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany.
Institut Laue Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
Phys Rev Lett. 2017 Apr 7;118(14):147002. doi: 10.1103/PhysRevLett.118.147002. Epub 2017 Apr 5.
Inelastic neutron scattering experiments on Sr_{2}RuO_{4} determine the spectral weight of the nesting induced magnetic fluctuations across the superconducting transition. There is no observable change at the superconducting transition down to an energy of ∼0.35 meV, which is well below the 2Δ values reported in several tunneling experiments. At this and higher energies magnetic fluctuations clearly persist in the superconducting state. Only at energies below ∼0.3 meV can evidence for partial suppression of spectral weight in the superconducting state be observed. This strongly suggests that the one-dimensional bands with the associated nesting fluctuations do not form the active, highly gapped bands in the superconducting pairing in Sr_{2}RuO_{4}.
对 Sr₂RuO₄ 进行的非弹性中子散射实验确定了在超导转变过程中由嵌套引起的磁涨落的光谱权重。在超导转变时，直至约 0.35 meV 的能量，均未观察到可察觉的变化，该能量远低于若干隧道实验中报道的 2Δ 值。在这个能量及更高能量下，磁涨落在超导态中显然持续存在。仅在低于约 0.3 meV 的能量处，才能观察到超导态中光谱权重部分被抑制的证据。这强烈表明，具有相关嵌套涨落的一维能带并非 Sr₂RuO₄ 超导配对中起作用的、具有高度能隙的能带。
