Braden M, Friedt O, Sidis Y, Bourges P, Minakata M, Maeno Y
Forschungszentrum Karlsruhe, IFP, Postfach 3640, D-76021 Karlsruhe, Germany.
Phys Rev Lett. 2002 May 13;88(19):197002. doi: 10.1103/PhysRevLett.88.197002. Epub 2002 Apr 30.
In Sr2RuO4 the spin excitation spectrum is dominated by incommensurate fluctuations at q = (0.3 0.3q(z)), which arise from Fermi-surface nesting. We show that upon Ti substitution, known to suppress superconductivity, a short range magnetic order develops with a propagation vector (0.307 0.307 1). In Sr2Ru0.91Ti0.09O4, the ordered moment points along the c direction. This finding shows that superconducting Sr2RuO4 is extremely close to an incommensurate spin density wave instability.
在Sr2RuO4中，自旋激发谱由q = (0.3 0.3q(z))处的非公度涨落主导，这种涨落源于费米面嵌套。我们表明，在已知会抑制超导性的Ti替代后，会形成具有传播矢量(0.307 0.307 1)的短程磁有序。在Sr2Ru0.91Ti0.09O4中，有序磁矩沿c方向。这一发现表明，超导的Sr2RuO4极其接近非公度自旋密度波不稳定性。
