Band-Selective Modification of the Magnetic Fluctuations in Sr2RuO4: Study of Substitution Effects
| dc.creator | Kikugawa, N. | |
| dc.creator | Bergemann, C. | |
| dc.creator | Mackenzie, A. P. | |
| dc.creator | Maeno, Y. | |
| dc.date | 2002-11-13 | |
| dc.date | 2004-04-30 | |
| dc.date.accessioned | 2026-07-07T02:48:09Z | |
| dc.date.available | 2026-07-07T02:48:09Z | |
| dc.description | We report a study of magnetic, thermal, and transport properties of La(3+) substituted Sr2RuO4, performed in order to investigate the effects of additional electron doping in this correlated metal. A gradual enhancement of the electronic part of specific heat and a more drastic increase of the static magnetic susceptibility were observed in Sr(2-y)La(y)RuO(4) with increasing y. Furthermore, the quasi-two-dimensional Fermi-liquid behavior seen in pure Sr2RuO4 breaks down near the critical concentration y ~ 0.20. Combined with a realistic tight-binding model with rigid-band shift of Fermi level, the enhancement of the density of states can be ascribed to the elevation of the Fermi energy toward a van Hove singularity of the thermodynamically dominant γFermi-surface sheet. On approaching the van Hove singularity, the effective nesting-vector of the γband shrinks and further enhances the susceptibility near the wave vector q ~ 0. We attribute the non-Fermi-liquid behavior to two-dimensional ferromagnetic fluctuations with short range correlations at the van Hove singularity. The observed behavior is in sharp contrast to that of Ti(4+) substitution in Sr2RuO4 which enhances antiferromagnetic fluctuations and subsequently induces incommensurate magnetic ordering associated with the nesting between the other Fermi-surface sheets (αand β). We thus establish that substitution of appropriate chemical dopants can band-selectively modify the spin-fluctuation spectrum in the spin-triplet superconductor Sr2RuO4. | |
| dc.description | 8 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0211248 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0211248 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/20290 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Band-Selective Modification of the Magnetic Fluctuations in Sr2RuO4: Study of Substitution Effects | |
| dc.type | text |