title: Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments.
abstract: Materials with strong correlations are prone to spin and charge instabilities, driven by Coulomb, magnetic, and lattice interactions. In materials that have significant localized and itinerant spins, it is not obvious which will induce order. We combine electrical transport, X-ray magnetic diffraction, and photoemission studies with band structure calculations to characterize successive antiferromagnetic transitions in GdSi. GdSi has both sizable local moments and a partially nested Fermi surface, without confounding contributions from orbital effects. We identify a route to incommensurate order where neither type of moment dominates, but is rooted in cooperative feedback between them. The nested Fermi surface of the itinerant electrons induces strong interactions between local moments at the nesting vector, whereas the ordered local moments in turn provide the necessary coupling for a spin-density wave to form among the itinerant electrons. This mechanism echoes the cooperative interactions between electrons and ions in charge-density-wave materials, and should be germane across a spectrum of transition-metal and rare-earth intermetallic compounds.
authors: The Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA. yejun@aps.anl.gov
authors: Yejun
authors: Y
authors: Feng
authors: Jiyang
authors: J
authors: Wang
authors: D M
authors: DM
authors: Silevitch
authors: B
authors: B
authors: Mihaila
authors: J W
authors: JW
authors: Kim
authors: J-Q
authors: JQ
authors: Yan
authors: R K
authors: RK
authors: Schulze
authors: Nayoon
authors: N
authors: Woo
authors: A
authors: A
authors: Palmer
authors: Y
authors: Y
authors: Ren
authors: Jasper
authors: J
authors: van Wezel
authors: P B
authors: PB
authors: Littlewood
authors: T F
authors: TF
authors: Rosenbaum
references: Phys Rev B Condens Matter. 1993 Jul 1;48(1):487-498
references: 10006799
references: Phys Rev Lett. 2009 Jan 30;102(4):046401
references: 19257445
references: Phys Rev Lett. 2003 Mar 21;90(11):116601
references: 12688949
references: Proc Natl Acad Sci U S A. 2012 May 8;109(19):7224-9
references: 22529348
references: Nature. 2003 Nov 6;426(6962):55-8
references: 14603314
references: Nature. 2000 Sep 21;407(6802):351-5
references: 11014185
references: Nature. 2005 Feb 10;433(7026):607-10
references: 15703740
references: Proc Natl Acad Sci U S A. 2010 Aug 3;107(31):13631-5
references: 20643972
references: J Phys Condens Matter. 2012 Apr 11;24(14):146003
references: 22418056
references: Phys Rev B Condens Matter. 1996 Mar 1;53(10):6355-6361
references: 9982033
references: Phys Rev Lett. 1995 Mar 20;74(12):2379-2382
references: 10057913
references: Nature. 2004 Jun 3;429(6991):531-4
references: 15175744