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Hennings, B. D.; Naugle, D. G.; Canfield, P. C.

doi:10.1103/physrevb.66.214512

Cited by 14 publications

(10 citation statements)

References 19 publications

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“…3), RNi 2 Ge 2 (R = La-Nd, Sm-Yb), 8 or RNi 2 B 2 C (R = Gd, Tb, Er). 9 The incommensurate wave vector does not intersect the paramagnetic (PM) Fermi surface, and there is no band gap opened upon magnetic ordering, distinguishing these magnetic transitions from those dependent upon a nesting condition.…”

Section: Introductionmentioning

confidence: 99%

Evolution of incommensurate spin order with magnetic field and temperature in the itinerant antiferromagnet GdSi

et al. 2013

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GdSi exhibits spin-density-wave (SDW) order arising from the cooperative interplay of sizeable local moments and a partially nested Fermi sea of itinerant electrons. Using magnetotransport, magnetization, and nonresonant magnetic x-ray diffraction techniques, we determine the H-T phase diagrams of GdSi for magnetic fields up to 21 T, where antiferromagnetic order is no longer stable, and field directions along each of the three major crystal axes. While the incommensurate magnetic ordering vector that characterizes the SDW is robust under magnetic field, the multiple spin structures of this compound are highly flexible and rotate relative to the applied field via either canting or spin-flop processes. The antiferromagnetic spin densities always arrange themselves transverse to the applied magnetic field direction. The phase diagrams are delineated by two types of phase boundaries: one separates a collinear from a planar spin structure associated with a lattice structural transition, and the other defines a spin flop transition that is only weakly temperature dependent. The major features of the phase diagrams along each of the crystal axes can be explained by the combination of local moment and global Fermi surface physics at play.

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Section: Introductionmentioning

confidence: 99%

Evolution of incommensurate spin order with magnetic field and temperature in the itinerant antiferromagnet GdSi

et al. 2013

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“…However, long-range incommensurate spin ordering was revealed by X-ray magnetic diffraction in several Gd compounds such as GdCo 2 Ge 2 , GdNi 2 Ge 2 , and GdNi 2 B 2 C (6,7,19), and the idea of cooperative RKKY and nesting effects was discussed in systems such as GdNi 2 Ge 2 (19) and Tb 2 PdSi 3 (20). However, for GdNi 2 Ge 2 and GdNi 2 B 2 C, lack of a resistance anomaly at the onset of magnetic ordering suggests that the incommensurate spin structure is not likely to involve any gapping of the Fermi surface (21,22), and for Tb 2 PdSi 3 it is unclear whether resolution-limited, longrange magnetic order exists at the wave vector suggested by the angle-resolved photoemission spectroscopy (ARPES) work (20).…”

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confidence: 99%

Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments

Feng

Wang

Silevitch

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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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 spindensity 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.itinerant magnetism | RKKY interaction | asymmetric line shape I ncommensurate density waves emerge in a wide variety of correlated electron systems. They are a common aspect in cuprate superconductors (1, 2), itinerant transition-metal magnets (3, 4), and rare-earth compounds (5-7), as well as low-dimensional charge-ordered materials (8, 9) and perovskite manganites (10, 11). In contrast with commensurate density waves, the incommensurate states are often electronically soft (11), and many spin and charge orders in metals are continuously tunable (9, 12). Furthermore, the incommensurate structures are often only weakly coupled to other degrees of freedom in the underlying lattice, giving rise to the rare possibility of direct theoretical modeling of a variety of experimentally accessible material systems, spanning from functional materials of technological importance (10, 11) to fundamental topics of emergent states in quantum critical phenomena (9, 12).Spin states with long-range incommensurate magnetic order may be stabilized by itinerant electrons through two distinct mechanisms. If the Fermi surface has well-nested regions, the itinerant electrons themselves typically become unstable toward the formation of a spin-density wave (SDW) (13). A prominent example of this class of materials is elemental chromium (4,13,14). Alternatively, in the presence of local magnetic moments, the itinerant electrons may form screening clouds which mediate magnetic interactions between the local moments and cause them to order through the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction (5, 15).To form a nesting-driven SDW or charge-density wave (CDW) (13), it is necessary to have a nonzero coupling between itinerant electron states on opposing portions of the nested Fermi surface. In the presence of a perfectly nested Fermi surface, the required coupling strength may be inf...

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“…At T c =2 % 1 K, the k=T curve of PrOs 4 Sb 12 exhibits a local maximum, which disappears under magnetic fields of about only 20 mT 5H c2 (similar as on sample A [9]). At the lowest temperatures, we observe below about 0.1 K a clean T 3 behavior of k. Experimentally, this behavior is well-documented from superconducting Nb and Pb [11,12], or from the rare-earth nickel borocarbides RNi 2 B 2 C (R ¼ Lu, Y) [13][14][15]. The scenario is an increase of the inelastic mean free path of both electrons and phonons when entering the superconducting state, due to the condensation of electronic scattering centers.…”

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confidence: 77%