Magnetic properties of weakly doped antiferromagnets

• Type: Article in International Scientific Journal
• Date: 1999

Authors

I. R. Pimentel (Author) FEUP; F. Carvalho Dias (Author) FEUP; L. M. Martelo (Author) FEUP; R. Orbach (Author) FEUP

Journal

Title: Physical Review B

Pages: 12329-12334

ISSN: 2469-9950

Publisher: American Physical Society

Indexing

ISI Web of Science

Scientific classification

FOS: Natural sciences > Physical sciences

CORDIS: Physical sciences > Physics > Condensed matter properties

Other information

DOI: 10.1103/PhysRevB.60.12329

Abstract (EN): We study the spin excitations and the transverse susceptibility of a two-dimensional antiferromagnet doped with a small concentration of holes in the t-J model. The motion of holes generates a renormalization of the magnetic properties. The Green’s functions are calculated in the self-consistent Born approximation. It is shown that the long-wavelength spin waves are significantly softened and the shorter-wavelength spin waves become strongly damped as the doping increases. The spin wave velocity is reduced by the coherent motion of holes, and not increased as has been claimed elsewhere. The transverse susceptibility is found to increase considerably with doping, also as a result of coherent hole motion. Our results are in agreement with experi- mental data for the doped copper oxide superconductors.

Language: English

Type (Professor's evaluation): Scientific