Effects of band filling on magnetic structures: The case of RNi2Ge2

Authors
Islam, Z Detlefs, C Song, C Goldman, AI Antropov, V Harmon, BN Bud'ko, SL Wiener, T Canfield, PC Wermeille, D Finkelstein, KD
Citation
Z. Islam et al., Effects of band filling on magnetic structures: The case of RNi2Ge2, PHYS REV L, 83(14), 1999, pp. 2817-2820
Citations number
28
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
14
Year of publication
1999
Pages
2817 - 2820
Database
ISI
SICI code
0031-9007(19991004)83:14<2817:EOBFOM>2.0.ZU;2-K
Abstract
We establish that strong Fermi surface nesting drives the Neel transition i n the RNi2Ge2 compounds. Generalized susceptibility, chi(0)(q), calculation s found nesting to be responsible for both incommensurate wave vector, (0 0 0.793), in GdNi2Ge2, and the commensurate structure, (0 0 1), in EuNi2Ge2, as revealed by x-ray resonant exchange scattering. A continuous transition from incommensurate to commensurate magnetic structures via band filling i s predicted. The surprisingly higher T-N in EuNi2Ge2 than that in GdNi2Ge2 is also explained.