Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.145: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Quasi-one-dimensional magnetic correlations in Sr₂RuO₄ — •Ralph Werner — Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany

Starting from the quasi-one-dimensional kinetic energy of the d_yz and d_zx bands a bosonized description of the correlated electron system in Sr₂RuO₄ is derived [1]. At intermediate coupling the magnetic correlations have a quasi-one-dimensional component along the diagonals of the basal plane of the tetragonal unit cell that accounts for the observed neutron scattering results [2]. The scale invariance of the magnetic correlations is reproduced by a conformally invariant description. The scaling dimension of x∼ 0.5 −0.6 is consistent with the intermediate coupling regime. The presence of four distinct peaks in the in-plane magnetic structure factor is consistent with the geometry of the bosonized action. Implications on other normal state properties and the nature of the quantum-phase transition in Sr₂Ru_1−yTi_yO₄ are discussed.

[1] R. Werner and V. J. Emery, Phys. Rev. B, in print (2003).

[2] M. Braden et al., Phys. Rev. B 66, 064522 (2002)