Spin fluctuations in a metallic antiferromagnet
| dc.creator | Singh, Avinash | |
| dc.date | 2002-07-01 | |
| dc.date.accessioned | 2026-07-07T02:46:03Z | |
| dc.date.available | 2026-07-07T02:46:03Z | |
| dc.description | The magnon energy and amplitude renormalization due to intraband particle-hole excitations are studied in a metallic antiferromagnet. The change in sign of the intraband contribution with $ω$ results in significant differences between static and dynamical behaviours. For electron doping, while the coherent magnon peak looses spectral weight and is shifted to higher energy with doping, the low-energy incoherent part becomes increasingly prominent as it narrows in width and shifts to lower energy. Implications for spin dynamics in the electron-doped cuprate $\rm Nd_{2-x} Ce_x Cu O_4$ are discussed. Due to an exact cancellation of two logarithmically divergent spin-fluctuation processes, the AF order parameter is unaffected to leading order. For hole doping, short wavelength transverse perturbations ($q > q^* \sim \sqrt{x}$) are found to be stable, implying short-range AF order with a spin correlation length $ξ/a \sim 1/\sqrt{x}$. | |
| dc.description | 8 pages, 13 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0207032 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0207032 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/19524 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Spin fluctuations in a metallic antiferromagnet | |
| dc.type | text |